Merge branch 'Skyrat-SS13:master' into master

2026-06-20 05:34:10 +01:00 · 2023-01-10 18:59:01 -06:00
parent b931604fb8 861ed61d55
commit 3d5f72bc91
198 changed files with 1879 additions and 766 deletions
@@ -2,22 +2,36 @@ Any time you make a change to the schema files, remember to increment the databa

 Make sure to also update `DB_MAJOR_VERSION` and `DB_MINOR_VERSION`, which can be found in `code/__DEFINES/subsystem.dm`.

-The latest database version is 5.24 (5.22 for /tg/); The query to update the schema revision table is:
+The latest database version is 5.25 (5.23 for /tg/); The query to update the schema revision table is:

-INSERT INTO `schema_revision` (`major`, `minor`) VALUES (5, 24);
+INSERT INTO `schema_revision` (`major`, `minor`) VALUES (5, 25);
 or
-INSERT INTO `SS13_schema_revision` (`major`, `minor`) VALUES (5, 24);
+INSERT INTO `SS13_schema_revision` (`major`, `minor`) VALUES (5, 25);

 In any query remember to add a prefix to the table names if you use one.

+-----------------------------------------------------
+Version 5.25, 28 December 2022, by Mothblocks
+Added `tutorial_completions` to mark what ckeys have completed contextual tutorials.
+
+```
+CREATE TABLE `tutorial_completions` (
+  `id` INT NOT NULL AUTO_INCREMENT,
+  `ckey` VARCHAR(32) NOT NULL,
+  `tutorial_key` VARCHAR(64) NOT NULL,
+  PRIMARY KEY (`id`),
+  UNIQUE INDEX `ckey_tutorial_unique` (`ckey`, `tutorial_key`));
+```
+
+-----------------------------------------------------
 Version 5.24, 22 December 2021, by Mothblocks
 Fixes a bug in `telemetry_connections` that limited the range of IPs.

 ```
 ALTER TABLE `telemetry_connections` MODIFY COLUMN `address` INT(10) UNSIGNED NOT NULL;
 ```
-----------------------------------------------------

+-----------------------------------------------------
 Version 5.23, 15 December 2021, by Mothblocks
 Adds `telemetry_connections` table for tracking tgui telemetry.

@@ -716,6 +716,14 @@ CREATE TABLE `telemetry_connections` (
    UNIQUE INDEX `unique_constraints` (`ckey` , `telemetry_ckey` , `address` , `computer_id`)
 );

+DROP TABLE IF EXISTS `tutorial_completions`;
+CREATE TABLE `tutorial_completions` (
+  `id` INT NOT NULL AUTO_INCREMENT,
+  `ckey` VARCHAR(32) NOT NULL,
+  `tutorial_key` VARCHAR(64) NOT NULL,
+  PRIMARY KEY (`id`),
+  UNIQUE INDEX `ckey_tutorial_unique` (`ckey`, `tutorial_key`));
+
 /*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
 /*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
 /*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
@@ -700,6 +700,14 @@ CREATE TABLE `SS13_telemetry_connections` (
    UNIQUE INDEX `unique_constraints` (`ckey` , `telemetry_ckey` , `address` , `computer_id`)
 );

+DROP TABLE IF EXISTS `SS13_tutorial_completions`;
+CREATE TABLE `SS13_tutorial_completions` (
+  `id` INT NOT NULL AUTO_INCREMENT,
+  `ckey` VARCHAR(32) NOT NULL,
+  `tutorial_key` VARCHAR(64) NOT NULL,
+  PRIMARY KEY (`id`),
+  UNIQUE INDEX `ckey_tutorial_unique` (`ckey`, `tutorial_key`));
+
 /*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
 /*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
 /*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
@@ -35,7 +35,7 @@
 #define MEDAL_VOID_ASCENSION "Void"
 #define MEDAL_BLADE_ASCENSION "Blade"
 #define MEDAL_TOOLBOX_SOUL "Toolsoul"
-#define MEDAL_CHEM_TUT          "Beginner Chemist"
+#define MEDAL_CHEM_TUT "Beginner Chemist"
 #define MEDAL_HOT_DAMN "Hot Damn!"
 #define MEDAL_CAYENNE_DISK "Very Important Piscis"
 #define MEDAL_TRAM_SURFER "Tram Surfer"
@@ -69,24 +69,23 @@

 //Mafia medal hub IDs (misc stuff)
 #define MAFIA_MEDAL_HATED "Universally Hated"
-#define MAFIA_MEDAL_CHARISMATIC "Charismatic"
-#define MAFIA_MEDAL_VIP "VIP"

 //Boss medals

 // Medal hub IDs for boss medals (Pre-fixes)
-#define BOSS_MEDAL_ANY   "Boss Killer"
-#define BOSS_MEDAL_MINER   "Blood-drunk Miner Killer"
+#define BOSS_MEDAL_ANY "Boss Killer"
+
+#define BOSS_MEDAL_MINER "Blood-drunk Miner Killer"
 #define BOSS_MEDAL_FROSTMINER "Demonic-frost Miner Killer"
-#define BOSS_MEDAL_BUBBLEGUM  "Bubblegum Killer"
-#define BOSS_MEDAL_COLOSSUS   "Colossus Killer"
-#define BOSS_MEDAL_DRAKE   "Drake Killer"
+#define BOSS_MEDAL_BUBBLEGUM "Bubblegum Killer"
+#define BOSS_MEDAL_COLOSSUS "Colossus Killer"
+#define BOSS_MEDAL_DRAKE "Drake Killer"
 #define BOSS_MEDAL_HIEROPHANT "Hierophant Killer"
-#define BOSS_MEDAL_LEGION   "Legion Killer"
-#define BOSS_MEDAL_TENDRIL   "Tendril Exterminator"
-#define BOSS_MEDAL_SWARMERS   "Swarmer Beacon Killer"
-#define BOSS_MEDAL_WENDIGO    "Wendigo Killer"
-#define BOSS_MEDAL_KINGGOAT   "King Goat Killer"
+#define BOSS_MEDAL_LEGION "Legion Killer"
+#define BOSS_MEDAL_TENDRIL "Tendril Exterminator"
+#define BOSS_MEDAL_SWARMERS "Swarmer Beacon Killer"
+#define BOSS_MEDAL_WENDIGO "Wendigo Killer"
+#define BOSS_MEDAL_KINGGOAT "King Goat Killer"

 #define BOSS_MEDAL_MINER_CRUSHER "Blood-drunk Miner Crusher"
 #define BOSS_MEDAL_FROSTMINER_CRUSHER "Demonic-frost Miner Crusher"
@@ -100,18 +99,18 @@
 #define BOSS_MEDAL_KINGGOAT_CRUSHER "King Goat Crusher"

 // Medal hub IDs for boss-kill scores
-#define BOSS_SCORE          "Bosses Killed"
-#define MINER_SCORE  "BDMs Killed"
-#define FROST_MINER_SCORE  "DFMs Killed"
-#define BUBBLEGUM_SCORE  "Bubblegum Killed"
-#define COLOSSUS_SCORE      "Colossus Killed"
-#define DRAKE_SCORE      "Drakes Killed"
-#define HIEROPHANT_SCORE  "Hierophants Killed"
-#define LEGION_SCORE      "Legion Killed"
+#define BOSS_SCORE "Bosses Killed"
+#define MINER_SCORE "BDMs Killed"
+#define FROST_MINER_SCORE "DFMs Killed"
+#define BUBBLEGUM_SCORE "Bubblegum Killed"
+#define COLOSSUS_SCORE "Colossus Killed"
+#define DRAKE_SCORE "Drakes Killed"
+#define HIEROPHANT_SCORE "Hierophants Killed"
+#define LEGION_SCORE "Legion Killed"
 #define SWARMER_BEACON_SCORE "Swarmer Beacs Killed"
-#define WENDIGO_SCORE  "Wendigos Killed"
-#define KINGGOAT_SCORE      "King Goat Killed"
-#define TENDRIL_CLEAR_SCORE  "Tendrils Killed"
+#define WENDIGO_SCORE "Wendigos Killed"
+#define KINGGOAT_SCORE "King Goat Killed"
+#define TENDRIL_CLEAR_SCORE "Tendrils Killed"

 // DB ID for hardcore random mode
 #define HARDCORE_RANDOM_SCORE "Hardcore Random Score"
@@ -27,26 +27,24 @@
 #define DIAG_MECH_HUD "11"
 /// Bot HUDs
 #define DIAG_BOT_HUD "12"
-/// Circuit assembly health bar
-#define DIAG_CIRCUIT_HUD "13"
 /// Mech/Silicon tracking beacon, Circutry long range icon
-#define DIAG_TRACK_HUD "14"
+#define DIAG_TRACK_HUD "13"
 /// Airlock shock overlay
-#define DIAG_AIRLOCK_HUD "15"
+#define DIAG_AIRLOCK_HUD "14"
 /// Bot path indicators
-#define DIAG_PATH_HUD "16"
+#define DIAG_PATH_HUD "15"
 /// Gland indicators for abductors
-#define GLAND_HUD "17"
-#define SENTIENT_DISEASE_HUD "18"
-#define AI_DETECT_HUD "19"
+#define GLAND_HUD "16"
+#define SENTIENT_DISEASE_HUD "17"
+#define AI_DETECT_HUD "18"
 /// Displays launchpads' targeting reticle
-#define DIAG_LAUNCHPAD_HUD "22"
+#define DIAG_LAUNCHPAD_HUD "19"
 //for antag huds. these are used at the /mob level
-#define ANTAG_HUD "23"
+#define ANTAG_HUD "20"
 // for fans to identify pins
-#define FAN_HUD "24"
+#define FAN_HUD "21"
 /// Mech camera HUD
-#define DIAG_CAMERA_HUD "25"
+#define DIAG_CAMERA_HUD "22"

 // SKYRAT EDIT ADDITION BEGIN - gun permits
 /// ammo of guns
@@ -2,13 +2,13 @@
 /// Minimum alpha of footprints
 #define BLOODY_FOOTPRINT_BASE_ALPHA 20
 /// How much blood a regular blood splatter contains
-#define BLOOD_AMOUNT_PER_DECAL      50
+#define BLOOD_AMOUNT_PER_DECAL 50
 /// How much blood an item can have stuck on it
-#define BLOOD_ITEM_MAX              200
+#define BLOOD_ITEM_MAX 200
 /// How much blood a blood decal can contain
-#define BLOOD_POOL_MAX              300
+#define BLOOD_POOL_MAX 300
 /// How much blood a footprint need to at least contain
-#define BLOOD_FOOTPRINTS_MIN        5
+#define BLOOD_FOOTPRINTS_MIN 5

 //Bloody shoe blood states
 /// Red blood
@@ -28,8 +28,9 @@
 #define COLOR_ALMOST_BLACK "#333333"
 #define COLOR_FULL_TONER_BLACK "#101010"
 #define COLOR_PRISONER_BLACK "#292929"
+#define COLOR_NEARLY_ALL_BLACK "#111111"
 #define COLOR_BLACK "#000000"
-#define COLOR_HALF_TRANSPARENT_BLACK    "#0000007A"
+#define COLOR_HALF_TRANSPARENT_BLACK "#0000007A"

 #define COLOR_RED "#FF0000"
 #define COLOR_SYNDIE_RED "#F10303"
@@ -120,30 +121,30 @@
 #define COLOR_SOAPSTONE_GOLD "#FFD900"
 #define COLOR_SOAPSTONE_DIAMOND "#00ffee"

-#define COLOR_GREEN_GRAY       "#99BB76"
-#define COLOR_RED_GRAY         "#B4696A"
-#define COLOR_PALE_BLUE_GRAY   "#98C5DF"
-#define COLOR_PALE_GREEN_GRAY  "#B7D993"
-#define COLOR_PALE_RED_GRAY    "#D59998"
+#define COLOR_GREEN_GRAY "#99BB76"
+#define COLOR_RED_GRAY "#B4696A"
+#define COLOR_PALE_BLUE_GRAY "#98C5DF"
+#define COLOR_PALE_GREEN_GRAY "#B7D993"
+#define COLOR_PALE_RED_GRAY "#D59998"
 #define COLOR_PALE_PURPLE_GRAY "#CBB1CA"
-#define COLOR_PURPLE_GRAY      "#AE8CA8"
+#define COLOR_PURPLE_GRAY "#AE8CA8"

 //Color defines used by the assembly detailer.
-#define COLOR_ASSEMBLY_BLACK   "#545454"
-#define COLOR_ASSEMBLY_BGRAY   "#9497AB"
-#define COLOR_ASSEMBLY_WHITE   "#E2E2E2"
-#define COLOR_ASSEMBLY_RED     "#CC4242"
-#define COLOR_ASSEMBLY_ORANGE  "#E39751"
-#define COLOR_ASSEMBLY_BEIGE   "#AF9366"
-#define COLOR_ASSEMBLY_BROWN   "#97670E"
-#define COLOR_ASSEMBLY_GOLD    "#AA9100"
-#define COLOR_ASSEMBLY_YELLOW  "#CECA2B"
-#define COLOR_ASSEMBLY_GURKHA  "#999875"
-#define COLOR_ASSEMBLY_LGREEN  "#789876"
-#define COLOR_ASSEMBLY_GREEN   "#44843C"
-#define COLOR_ASSEMBLY_LBLUE   "#5D99BE"
-#define COLOR_ASSEMBLY_BLUE    "#38559E"
-#define COLOR_ASSEMBLY_PURPLE  "#6F6192"
+#define COLOR_ASSEMBLY_BLACK "#545454"
+#define COLOR_ASSEMBLY_BGRAY "#9497AB"
+#define COLOR_ASSEMBLY_WHITE "#E2E2E2"
+#define COLOR_ASSEMBLY_RED "#CC4242"
+#define COLOR_ASSEMBLY_ORANGE "#E39751"
+#define COLOR_ASSEMBLY_BEIGE "#AF9366"
+#define COLOR_ASSEMBLY_BROWN "#97670E"
+#define COLOR_ASSEMBLY_GOLD "#AA9100"
+#define COLOR_ASSEMBLY_YELLOW "#CECA2B"
+#define COLOR_ASSEMBLY_GURKHA "#999875"
+#define COLOR_ASSEMBLY_LGREEN "#789876"
+#define COLOR_ASSEMBLY_GREEN "#44843C"
+#define COLOR_ASSEMBLY_LBLUE "#5D99BE"
+#define COLOR_ASSEMBLY_BLUE "#38559E"
+#define COLOR_ASSEMBLY_PURPLE "#6F6192"

 ///Colors for grayscale tools
 #define COLOR_TOOL_BLUE "#1861d5"
@@ -303,4 +304,4 @@ GLOBAL_LIST_INIT(cable_colors, list(
 	CABLE_COLOR_WHITE = CABLE_HEX_COLOR_WHITE,
 	CABLE_COLOR_YELLOW = CABLE_HEX_COLOR_YELLOW,
 	CABLE_COLOR_BROWN = CABLE_HEX_COLOR_BROWN
-	))
+))
@@ -56,9 +56,9 @@
 #define FIRELOSS (1<<1)
 #define TOXLOSS (1<<2)
 #define OXYLOSS (1<<3)
-#define SHAME             (1<<4)
+#define SHAME (1<<4)
 #define MANUAL_SUICIDE (1<<5) //suicide_act will do the actual killing.
-#define MANUAL_SUICIDE_NONLETHAL (1<<6)  //when the suicide is conditionally lethal
+#define MANUAL_SUICIDE_NONLETHAL (1<<6) //when the suicide is conditionally lethal

 #define EFFECT_STUN "stun"
 #define EFFECT_KNOCKDOWN "knockdown"
@@ -11,3 +11,5 @@
 	/// When returned on a signal hooked to [COMSIG_ATOM_EXPLODE], [COMSIG_ATOM_INTERNAL_EXPLOSION], or [COMSIG_AREA_INTERNAL_EXPLOSION] it prevents the explosion from being propagated further.
 	#define COMSIG_CANCEL_EXPLOSION (1<<0)

+/// from [/atom/movable/proc/set_explosion_resistance] : (old_block, new_block)
+#define COMSIG_MOVABLE_EXPLOSION_BLOCK_CHANGED "explosion_block_changed"
@@ -133,5 +133,9 @@

 /// From /mob/living/befriend() : (mob/living/new_friend)
 #define COMSIG_LIVING_BEFRIENDED "living_befriended"
+
+/// From /obj/item/proc/pickup(): (/obj/item/picked_up_item)
+#define COMSIG_LIVING_PICKED_UP_ITEM "living_picked_up_item"
+
 /// From /mob/living/unfriend() : (mob/living/old_friend)
 #define COMSIG_LIVING_UNFRIENDED "living_unfriended"
@@ -116,9 +116,12 @@
 	#define MOB_DEADSAY_SIGNAL_INTERCEPT (1<<0)
 ///from /mob/living/emote(): ()
 #define COMSIG_MOB_EMOTE "mob_emote"
-///from base of mob/swap_hand(): (obj/item)
-#define COMSIG_MOB_SWAP_HANDS "mob_swap_hands"
+///from base of mob/swap_hand(): (obj/item/currently_held_item)
+#define COMSIG_MOB_SWAPPING_HANDS "mob_swapping_hands"
 	#define COMPONENT_BLOCK_SWAP (1<<0)
+/// from base of mob/swap_hand(): ()
+/// Performed after the hands are swapped.
+#define COMSIG_MOB_SWAP_HANDS "mob_swap_hands"
 ///from base of /mob/verb/pointed: (atom/A)
 #define COMSIG_MOB_POINTED "mob_pointed"
 ///Mob is trying to open the wires of a target [/atom], from /datum/wires/interactable(): (atom/target)
@@ -171,5 +174,9 @@

 ///from living/flash_act(), when a mob is successfully flashed.
 #define COMSIG_MOB_FLASHED "mob_flashed"
+
 /// from mob/get_status_tab_items(): (list/items)
 #define COMSIG_MOB_GET_STATUS_TAB_ITEMS "mob_get_status_tab_items"
+
+/// from mob/proc/dropItemToGround()
+#define COMSIG_MOB_DROPPING_ITEM "mob_dropping_item"
@@ -18,9 +18,6 @@
 /// Gibtonite will now explode
 #define GIBTONITE_DETONATE 3

-/// For object explosion block calculation
-#define EXPLOSION_BLOCK_PROC -1
-
 /// A wrapper for [/atom/proc/ex_act] to ensure that the explosion propagation and attendant signal are always handled.
 #define EX_ACT(target, args...)\
 	if(!(target.flags_1 & PREVENT_CONTENTS_EXPLOSION_1)) { \
@@ -12,13 +12,5 @@
 /// Font used when signing on paper.
 #define SIGNATURE_FONT "Segoe Script"

-//pda fonts
-#define MONO "Monospaced"
-#define VT "VT323"
-#define ORBITRON "Orbitron"
-#define SHARE "Share Tech Mono"
-
-GLOBAL_LIST_INIT(pda_styles, sort_list(list(MONO, VT, ORBITRON, SHARE)))
-
 /// Emoji icon set
 #define EMOJI_SET 'modular_skyrat/master_files/icons/emoji.dmi' // SKYRAT EDIT - ORIGINAL: 'icons/ui_icons/emoji/emoji.dmi'
@@ -117,7 +117,7 @@ DEFINE_BITFIELD(food_flags, list(
 ///Amount of reagents you start with on crafted food excluding the used parts
 #define CRAFTED_FOOD_BASE_REAGENT_MODIFIER 0.7
 ///Modifier of reagents you get when crafting food from the parts used
-#define CRAFTED_FOOD_INGREDIENT_REAGENT_MODIFIER  0.5
+#define CRAFTED_FOOD_INGREDIENT_REAGENT_MODIFIER 0.5

 #define IS_EDIBLE(O) (O.GetComponent(/datum/component/edible))

@@ -135,8 +135,8 @@
 #define ui_borg_lamp "CENTER-3:16, SOUTH:5"
 #define ui_borg_tablet "CENTER-4:16, SOUTH:5"
 #define ui_inv1 "CENTER-2:16,SOUTH:5"
-#define ui_inv2 "CENTER-1  :16,SOUTH:5"
-#define ui_inv3 "CENTER  :16,SOUTH:5"
+#define ui_inv2 "CENTER-1 :16,SOUTH:5"
+#define ui_inv3 "CENTER :16,SOUTH:5"
 #define ui_borg_module "CENTER+1:16,SOUTH:5"
 #define ui_borg_store "CENTER+2:16,SOUTH:5"
 #define ui_borg_camera "CENTER+3:21,SOUTH:5"
@@ -146,8 +146,8 @@ DEFINE_BITFIELD(smoothing_flags, list(
 #define SMOOTH_GROUP_WINDOW_FULLTILE_PLASTITANIUM S_OBJ(24) ///turf/closed/indestructible/opsglass, /obj/structure/window/reinforced/plasma/plastitanium
 #define SMOOTH_GROUP_WINDOW_FULLTILE_SHUTTLE S_OBJ(25) ///obj/structure/window/reinforced/shuttle

-#define SMOOTH_GROUP_LATTICE  S_OBJ(31) ///obj/structure/lattice
-#define SMOOTH_GROUP_CATWALK  S_OBJ(32) ///obj/structure/lattice/catwalk
+#define SMOOTH_GROUP_LATTICE S_OBJ(31) ///obj/structure/lattice
+#define SMOOTH_GROUP_CATWALK S_OBJ(32) ///obj/structure/lattice/catwalk

 #define SMOOTH_GROUP_AIRLOCK S_OBJ(41) ///obj/machinery/door/airlock

@@ -279,3 +279,4 @@ GLOBAL_LIST_INIT(book_types, typecacheof(list(
 #define is_unassigned_job(job_type) (istype(job_type, /datum/job/unassigned))

 #define isprojectilespell(thing) (istype(thing, /datum/action/cooldown/spell/pointed/projectile))
+#define is_multi_tile_object(atom) (atom.bound_width > world.icon_size || atom.bound_height > world.icon_size)
@@ -240,6 +240,9 @@
 ///Layer for screentips
 #define SCREENTIP_LAYER 4

+/// Layer for tutorial instructions
+#define TUTORIAL_INSTRUCTIONS_LAYER 5
+

 #define LOBBY_BACKGROUND_LAYER 3
 #define LOBBY_BUTTON_LAYER 4
@@ -12,18 +12,18 @@

 //Bay lighting engine shit, not in /code/modules/lighting because BYOND is being shit about it
 /// frequency, in 1/10ths of a second, of the lighting process
-#define LIGHTING_INTERVAL       5
+#define LIGHTING_INTERVAL 5

 #define MINIMUM_USEFUL_LIGHT_RANGE 1.4

 /// type of falloff to use for lighting; 1 for circular, 2 for square
-#define LIGHTING_FALLOFF        1
+#define LIGHTING_FALLOFF 1
 /// use lambertian shading for light sources
-#define LIGHTING_LAMBERTIAN     0
+#define LIGHTING_LAMBERTIAN 0
 /// height off the ground of light sources on the pseudo-z-axis, you should probably leave this alone
-#define LIGHTING_HEIGHT         1
+#define LIGHTING_HEIGHT 1
 /// Value used to round lumcounts, values smaller than 1/129 don't matter (if they do, thanks sinking points), greater values will make lighting less precise, but in turn increase performance, VERY SLIGHTLY.
-#define LIGHTING_ROUND_VALUE    (1 / 64)
+#define LIGHTING_ROUND_VALUE (1 / 64)

 /// icon used for lighting shading effects
 #define LIGHTING_ICON 'icons/effects/lighting_object.dmi'
@@ -32,17 +32,6 @@
 /// Set to zero to disable soft lighting. Luminosity changes then work if it's lit at all.
 #define LIGHTING_SOFT_THRESHOLD 0

-/// If I were you I'd leave this alone.
-#define LIGHTING_BASE_MATRIX \
-	list                     \
-	(                        \
-		1, 1, 1, 0, \
-		1, 1, 1, 0, \
-		1, 1, 1, 0, \
-		1, 1, 1, 0, \
-		0, 0, 0, 1           \
-	)                        \
-
 ///How many tiles standard fires glow.
 #define LIGHT_RANGE_FIRE 3

@@ -237,5 +237,9 @@

 #define GET_TRUE_DIST(a, b) (a == null || b == null) ? -1 : max(abs(a.x -b.x), abs(a.y-b.y), abs(a.z-b.z))

+//We used to use linear regression to approximate the answer, but Mloc realized this was actually faster.
+//And lo and behold, it is, and it's more accurate to boot.
+#define CHEAP_HYPOTENUSE(Ax, Ay, Bx, By) (sqrt(abs(Ax - Bx) ** 2 + abs(Ay - By) ** 2)) //A squared + B squared = C squared
+
 /// The number of cells in a taxicab circle (rasterized diamond) of radius X.
 #define DIAMOND_AREA(X) (1 + 2*(X)*((X)+1))
@@ -1,2 +1,3 @@
-/// Helper macro for compile time translation
+/// Helper macro for creating a matrix at the given offsets.
+/// Works at compile time.
 #define TRANSLATE_MATRIX(offset_x, offset_y) matrix(1, 0, (offset_x), 0, 1, (offset_y))
@@ -8,7 +8,7 @@

 //movement intent defines for the m_intent var
 #define MOVE_INTENT_WALK "walk"
-#define MOVE_INTENT_RUN  "run"
+#define MOVE_INTENT_RUN "run"

 //Blood levels
 #define BLOOD_VOLUME_MAX_LETHAL 2150
@@ -35,8 +35,8 @@
 #define MOB_SIZE_HUGE 4 // Use this for things you don't want bluespace body-bagged

 //Ventcrawling defines
-#define VENTCRAWLER_NONE   0
-#define VENTCRAWLER_NUDE   1
+#define VENTCRAWLER_NONE 0
+#define VENTCRAWLER_NUDE 1
 #define VENTCRAWLER_ALWAYS 2

 //Mob bio-types flags
@@ -183,12 +183,12 @@
 #define BRAIN_TRAUMA_SPECIAL /datum/brain_trauma/special
 #define BRAIN_TRAUMA_MAGIC /datum/brain_trauma/magic

-#define TRAUMA_RESILIENCE_BASIC 1      //Curable with chems
-#define TRAUMA_RESILIENCE_SURGERY 2    //Curable with brain surgery
-#define TRAUMA_RESILIENCE_LOBOTOMY 3   //Curable with lobotomy
-#define TRAUMA_RESILIENCE_WOUND 4    //Curable by healing the head wound
-#define TRAUMA_RESILIENCE_MAGIC 5      //Curable only with magic
-#define TRAUMA_RESILIENCE_ABSOLUTE 6   //This is here to stay
+#define TRAUMA_RESILIENCE_BASIC 1 //Curable with chems
+#define TRAUMA_RESILIENCE_SURGERY 2 //Curable with brain surgery
+#define TRAUMA_RESILIENCE_LOBOTOMY 3 //Curable with lobotomy
+#define TRAUMA_RESILIENCE_WOUND 4 //Curable by healing the head wound
+#define TRAUMA_RESILIENCE_MAGIC 5 //Curable only with magic
+#define TRAUMA_RESILIENCE_ABSOLUTE 6 //This is here to stay

 //Limit of traumas for each resilience tier
 #define TRAUMA_LIMIT_BASIC 3
@@ -349,7 +349,7 @@
 //determines if a mob can smash through it
 #define ENVIRONMENT_SMASH_NONE 0
 #define ENVIRONMENT_SMASH_STRUCTURES 1 //crates, lockers, ect
-#define ENVIRONMENT_SMASH_WALLS 2  //walls
+#define ENVIRONMENT_SMASH_WALLS 2 //walls
 #define ENVIRONMENT_SMASH_RWALLS 3 //rwalls

 #define NO_SLIP_WHEN_WALKING (1<<0)
@@ -420,12 +420,12 @@
 //#define AGE_MIN 17	//youngest a character can be //ORIGINAL
 #define AGE_MIN	18	//youngest a character can be //SKYRAT EDIT CHANGE - age
 #define AGE_MAX 85 //oldest a character can be
-#define AGE_MINOR 20  //legal age of space drinking and smoking
+#define AGE_MINOR 20 //legal age of space drinking and smoking
 #define WIZARD_AGE_MIN 30 //youngest a wizard can be
 #define APPRENTICE_AGE_MIN 29 //youngest an apprentice can be

 #define SHOES_SLOWDOWN 0 //How much shoes slow you down by default. Negative values speed you up
-#define SHOES_SPEED_SLIGHT  SHOES_SLOWDOWN - 1 // slightest speed boost to movement
+#define SHOES_SPEED_SLIGHT SHOES_SLOWDOWN - 1 // slightest speed boost to movement
 #define POCKET_STRIP_DELAY (4 SECONDS) //time taken to search somebody's pockets
 #define DOOR_CRUSH_DAMAGE 15 //the amount of damage that airlocks deal when they crush you

@@ -25,7 +25,7 @@
 #define PROGRAM_CATEGORY_CREW "Crew"
 #define PROGRAM_CATEGORY_ENGI "Engineering"
 #define PROGRAM_CATEGORY_SUPL "Supply"
-#define PROGRAM_CATEGORY_SCI  "Science"
+#define PROGRAM_CATEGORY_SCI "Science"
 #define PROGRAM_CATEGORY_MISC "Other"

 #define DETOMATIX_RESIST_MINOR 1
@@ -14,7 +14,7 @@
 #define MONKEY_SYRINGE_RETALIATION_PROB 20

 // Probability per Life tick that the monkey will:
-///  probability that monkey aggro against the mob pulling it
+/// probability that monkey aggro against the mob pulling it
 #define MONKEY_PULL_AGGRO_PROB 5
 /// probability that monkey will get into mischief, i.e. finding/stealing items
 #define MONKEY_SHENANIGAN_PROB 20
@@ -78,7 +78,7 @@
 #define NETWORK_PORT_UPDATE(LIST) if(LIST) { LIST["_updated"] = TRUE }
 #define NETWORK_PORT_CLEAR_UPDATE(LIST) if(LIST) { LIST["_updated"] = FALSE }
 #define NETWORK_PORT_SET_UPDATE(LIST) if(LIST) { LIST["_updated"] = TRUE }
-#define NETWORK_PORT_DISCONNECT(LIST)  if(LIST) { LIST["_disconnected"] = TRUE }
+#define NETWORK_PORT_DISCONNECT(LIST) if(LIST) { LIST["_disconnected"] = TRUE }

 /// Error codes
 #define NETWORK_ERROR_OK null
@@ -4,9 +4,9 @@

 #define MACHINERY_LAYER_1 1

-#define SOLAR_TRACK_OFF     0
-#define SOLAR_TRACK_TIMED   1
-#define SOLAR_TRACK_AUTO    2
+#define SOLAR_TRACK_OFF 0
+#define SOLAR_TRACK_TIMED 1
+#define SOLAR_TRACK_AUTO 2

 ///conversion ratio from joules to watts
 #define WATTS / 0.002
@@ -31,7 +31,7 @@
 #define CHAT_GHOSTWHISPER (1<<7)
 #define CHAT_GHOSTPDA (1<<8)
 #define CHAT_GHOSTRADIO (1<<9)
-#define CHAT_BANKCARD  (1<<10)
+#define CHAT_BANKCARD (1<<10)
 #define CHAT_GHOSTLAWS (1<<11)
 #define CHAT_LOGIN_LOGOUT (1<<12)

@@ -29,7 +29,7 @@ Ask Mothblocks if they're around
 #define RAD_NO_INSULATION 1.0 // For things that shouldn't become irradiated for whatever reason
 #define RAD_VERY_LIGHT_INSULATION 0.9 // What girders have
 #define RAD_LIGHT_INSULATION 0.8
-#define RAD_MEDIUM_INSULATION  0.7 // What common walls have
+#define RAD_MEDIUM_INSULATION 0.7 // What common walls have
 #define RAD_HEAVY_INSULATION 0.6 // What reinforced walls have
 #define RAD_EXTREME_INSULATION 0.5 // What rad collectors have
 #define RAD_FULL_INSULATION 0 // Completely stops radiation from coming through
@@ -60,19 +60,19 @@
 // Frequencies are always odd numbers and range from 1201 to 1599.

 #define FREQ_UPLINK 1211	// Dummy loopback frequency, used for radio uplink. Not seen in game.
-#define FREQ_SYNDICATE 1213  // Nuke op comms frequency, dark brown
-#define FREQ_CTF_RED 1215  // CTF red team comms frequency, red
-#define FREQ_CTF_BLUE 1217  // CTF blue team comms frequency, blue
-#define FREQ_CTF_GREEN 1219  // CTF green team comms frequency, green
-#define FREQ_CTF_YELLOW 1221  // CTF yellow team comms frequency, yellow
-#define FREQ_CENTCOM 1337  // CentCom comms frequency, gray
-#define FREQ_SUPPLY 1347  // Supply comms frequency, light brown
-#define FREQ_SERVICE 1349  // Service comms frequency, green
-#define FREQ_SCIENCE 1351  // Science comms frequency, plum
-#define FREQ_COMMAND 1353  // Command comms frequency, gold
-#define FREQ_MEDICAL 1355  // Medical comms frequency, soft blue
-#define FREQ_ENGINEERING 1357  // Engineering comms frequency, orange
-#define FREQ_SECURITY 1359  // Security comms frequency, red
+#define FREQ_SYNDICATE 1213 // Nuke op comms frequency, dark brown
+#define FREQ_CTF_RED 1215 // CTF red team comms frequency, red
+#define FREQ_CTF_BLUE 1217 // CTF blue team comms frequency, blue
+#define FREQ_CTF_GREEN 1219 // CTF green team comms frequency, green
+#define FREQ_CTF_YELLOW 1221 // CTF yellow team comms frequency, yellow
+#define FREQ_CENTCOM 1337 // CentCom comms frequency, gray
+#define FREQ_SUPPLY 1347 // Supply comms frequency, light brown
+#define FREQ_SERVICE 1349 // Service comms frequency, green
+#define FREQ_SCIENCE 1351 // Science comms frequency, plum
+#define FREQ_COMMAND 1353 // Command comms frequency, gold
+#define FREQ_MEDICAL 1355 // Medical comms frequency, soft blue
+#define FREQ_ENGINEERING 1357 // Engineering comms frequency, orange
+#define FREQ_SECURITY 1359 // Security comms frequency, red

 #define FREQ_HOLOGRID_SOLUTION 1433
 #define FREQ_STATUS_DISPLAYS 1435
@@ -82,23 +82,23 @@
 // This represents 1/8th of the available spectrum.

 #define FREQ_NAV_BEACON 1445
-#define FREQ_AI_PRIVATE 1447  // AI private comms frequency, magenta
+#define FREQ_AI_PRIVATE 1447 // AI private comms frequency, magenta
 #define FREQ_PRESSURE_PLATE 1447
 #define FREQ_ELECTROPACK 1449
 #define FREQ_MAGNETS 1449
 #define FREQ_LOCATOR_IMPLANT 1451
-#define FREQ_SIGNALER 1457  // the default for new signalers
-#define FREQ_COMMON 1459  // Common comms frequency, dark green
+#define FREQ_SIGNALER 1457 // the default for new signalers
+#define FREQ_COMMON 1459 // Common comms frequency, dark green

 #define MAX_FREQ 1489 // ------------------------------------------------------

 #define MAX_FREE_FREQ 1599 // -------------------------------------------------

 // Transmission types.
-#define TRANSMISSION_WIRE 0  // some sort of wired connection, not used
-#define TRANSMISSION_RADIO 1  // electromagnetic radiation (default)
-#define TRANSMISSION_SUBSPACE 2  // subspace transmission (headsets only)
-#define TRANSMISSION_SUPERSPACE 3  // reaches independent (CentCom) radios only
+#define TRANSMISSION_WIRE 0 // some sort of wired connection, not used
+#define TRANSMISSION_RADIO 1 // electromagnetic radiation (default)
+#define TRANSMISSION_SUBSPACE 2 // subspace transmission (headsets only)
+#define TRANSMISSION_SUPERSPACE 3 // reaches independent (CentCom) radios only

 // Filter types, used as an optimization to avoid unnecessary proc calls.
 #define RADIO_SIGNALER "signaler"
@@ -1,3 +1,3 @@
-#define RESONATOR_MODE_AUTO   1
+#define RESONATOR_MODE_AUTO 1
 #define RESONATOR_MODE_MANUAL 2
 #define RESONATOR_MODE_MATRIX 3
@@ -20,7 +20,7 @@
 *
 * make sure you add an update to the schema_version stable in the db changelog
 */
-#define DB_MINOR_VERSION 24
+#define DB_MINOR_VERSION 25


 //! ## Timing subsystem
@@ -510,6 +510,8 @@ Remember to update _globalvars/traits.dm if you're adding/removing/renaming trai
 #define TRAIT_PARALYSIS "paralysis"
 /// Used for limbs.
 #define TRAIT_DISABLED_BY_WOUND "disabled-by-wound"
+/// This movable atom has the explosive block element
+#define TRAIT_BLOCKING_EXPLOSIVES "blocking_explosives"

 /// Mobs with this trait can't send the mining shuttle console when used outside the station itself
 #define TRAIT_FORBID_MINING_SHUTTLE_CONSOLE_OUTSIDE_STATION "forbid_mining_shuttle_console_outside_station"
@@ -15,7 +15,7 @@

 #define RECT_TURFS(H_RADIUS, V_RADIUS, CENTER) \
 	block( \
-	locate(max(CENTER.x-(H_RADIUS),1),          max(CENTER.y-(V_RADIUS),1),          CENTER.z), \
+	locate(max(CENTER.x-(H_RADIUS),1), max(CENTER.y-(V_RADIUS),1), CENTER.z), \
 	locate(min(CENTER.x+(H_RADIUS),world.maxx), min(CENTER.y+(V_RADIUS),world.maxy), CENTER.z) \
 	)

@@ -11,12 +11,6 @@
 		return null
 	return format_text ? format_text(checked_area.name) : checked_area.name

-//We used to use linear regression to approximate the answer, but Mloc realized this was actually faster.
-//And lo and behold, it is, and it's more accurate to boot.
-///Calculate the hypotenuse cheaply (this should be in maths.dm)
-/proc/cheap_hypotenuse(Ax, Ay, Bx, By)
-	return sqrt(abs(Ax - Bx) ** 2 + abs(Ay - By) ** 2) //A squared + B squared = C squared
-
 /** toggle_organ_decay
 * inputs: first_object (object to start with)
 * outputs:
@@ -18,14 +18,26 @@
 		y += view_size[2]
 	if(findtext(screen_loc, "SOUTH"))
 		y += world.icon_size
-	// Cut out everything we just parsed
-	screen_loc = cut_relative_direction(screen_loc)

 	var/list/x_and_y = splittext(screen_loc, ",")
+
 	var/list/x_pack = splittext(x_and_y[1], ":")
 	var/list/y_pack = splittext(x_and_y[2], ":")
-	x += text2num(x_pack[1]) * world.icon_size
-	y += text2num(y_pack[1]) * world.icon_size
+
+	var/x_coord = x_pack[1]
+	var/y_coord = y_pack[1]
+
+	if (findtext(x_coord, "CENTER"))
+		x += view_size[1] / 2
+
+	if (findtext(y_coord, "CENTER"))
+		y += view_size[2] / 2
+
+	x_coord = text2num(cut_relative_direction(x_coord))
+	y_coord = text2num(cut_relative_direction(y_coord))
+
+	x += x_coord * world.icon_size
+	y += y_coord * world.icon_size

 	if(length(x_pack) > 1)
 		x += text2num(x_pack[2])
@@ -48,7 +48,7 @@
 /atom/movable/screen/ghost/minigames_menu
 	name ="Minigames"
 	icon_state = "minigames"
-	
+
 /atom/movable/screen/ghost/minigames_menu/Click()
 	var/mob/dead/observer/observer = usr
 	observer.open_minigames_menu()
@@ -88,7 +88,7 @@
 	static_inventory += using

 	using = new /atom/movable/screen/language_menu
-	using.screen_loc = 	ui_ghost_language_menu
+	using.screen_loc = ui_ghost_language_menu
 	using.icon = ui_style
 	using.hud = src
 	static_inventory += using
@@ -59,7 +59,15 @@
 		if (after_attack_secondary_result == SECONDARY_ATTACK_CANCEL_ATTACK_CHAIN || after_attack_secondary_result == SECONDARY_ATTACK_CONTINUE_CHAIN)
 			return TRUE

-	return afterattack(target, user, TRUE, params) == TRUE
+	var/afterattack_result = afterattack(target, user, TRUE, params)
+
+	if (!(afterattack_result & AFTERATTACK_PROCESSED_ITEM) && isitem(target))
+		if (isnull(user.get_inactive_held_item()))
+			SStutorials.suggest_tutorial(user, /datum/tutorial/switch_hands, params2list(params))
+		else
+			SStutorials.suggest_tutorial(user, /datum/tutorial/drop, params2list(params))
+
+	return afterattack_result & TRUE //this is really stupid but its needed because afterattack can return TRUE | FLAGS.

 /// Called when the item is in the active hand, and clicked; alternately, there is an 'activate held object' verb or you can hit pagedown.
 /obj/item/proc/attack_self(mob/user, modifiers)
@@ -414,3 +414,4 @@

 /datum/config_entry/flag/disallow_circuit_sounds

+/datum/config_entry/flag/give_tutorials_without_db
@@ -649,3 +649,5 @@
 	default = 50

 /datum/config_entry/string/morgue_cadaver_override_species
+
+/datum/config_entry/flag/toast_notification_on_init
@@ -267,6 +267,9 @@ GLOBAL_REAL(Master, /datum/controller/master) = new
 	log_world(msg)


+	if(world.system_type == MS_WINDOWS && CONFIG_GET(flag/toast_notification_on_init) && !length(GLOB.clients))
+		world.shelleo("start /min powershell -ExecutionPolicy Bypass -File tools/initToast/initToast.ps1 -name \"[world.name]\" -icon %CD%\\icons\\ui_icons\\common\\tg_16.png -port [world.port]")
+
 	// Set world options.
 	world.change_fps(CONFIG_GET(number/fps))
 	var/initialized_tod = REALTIMEOFDAY
@@ -119,30 +119,31 @@ SUBSYSTEM_DEF(explosions)
 	var/x0 = epicenter.x
 	var/y0 = epicenter.y
 	var/list/wipe_colours = list()
-	for(var/turf/T in spiral_range_turfs(max_range, epicenter))
-		wipe_colours += T
-		var/dist = cheap_hypotenuse(T.x, T.y, x0, y0)
+	var/list/cached_exp_block = list()
+	for(var/turf/explode in prepare_explosion_turfs(max_range, epicenter))
+		wipe_colours += explode
+		var/our_x = explode.x
+		var/our_y = explode.y
+		var/dist = CHEAP_HYPOTENUSE(our_x, our_y, x0, y0)

 		if(newmode == "Yes")
-			var/turf/TT = T
-			while(TT != epicenter)
-				TT = get_step_towards(TT,epicenter)
-				if(TT.density)
-					dist += TT.explosion_block
-
-				for(var/obj/O in T)
-					var/the_block = O.explosion_block
-					dist += the_block == EXPLOSION_BLOCK_PROC ? O.GetExplosionBlock() : the_block
+			if(explode != epicenter)
+				var/our_block = cached_exp_block[get_step_towards(explode, epicenter)]
+				dist += our_block
+				cached_exp_block[explode] = our_block + explode.explosive_resistance
+			else
+				cached_exp_block[explode] = explode.explosive_resistance

+		dist = round(dist, 0.01)
 		if(dist < dev)
-			T.color = "red"
-			T.maptext = MAPTEXT("Dev")
+			explode.color = "red"
+			explode.maptext = MAPTEXT("[dist]")
 		else if (dist < heavy)
-			T.color = "yellow"
-			T.maptext = MAPTEXT("Heavy")
+			explode.color = "yellow"
+			explode.maptext = MAPTEXT("[dist]")
 		else if (dist < light)
-			T.color = "blue"
-			T.maptext = MAPTEXT("Light")
+			explode.color = "blue"
+			explode.maptext = MAPTEXT("[dist]")
 		else
 			continue

@@ -398,84 +399,82 @@ SUBSYSTEM_DEF(explosions)
 		for(var/mob/living/L in viewers(flash_range, epicenter))
 			L.flash_act()

-	var/list/affected_turfs = GatherSpiralTurfs(max_range, epicenter)
+	var/list/affected_turfs = prepare_explosion_turfs(max_range, epicenter)

 	var/reactionary = CONFIG_GET(flag/reactionary_explosions)
-	var/list/cached_exp_block
-
-	if(reactionary)
-		cached_exp_block = CaculateExplosionBlock(affected_turfs)
+	// this list is setup in the form position -> block for that position
+	// we assert that turfs will be processed closed to farthest, so we can build this as we go along
+	// This is gonna be an array, index'd by turfs
+	var/list/cached_exp_block = list()

 	//lists are guaranteed to contain at least 1 turf at this point
+	//we presuppose that we'll be iterating away from the epicenter
+	for(var/turf/explode as anything in affected_turfs)
+		var/our_x = explode.x
+		var/our_y = explode.y
+		var/dist = CHEAP_HYPOTENUSE(our_x, our_y, x0, y0)

-	for(var/TI in affected_turfs)
-		var/turf/T = TI
-		var/init_dist = cheap_hypotenuse(T.x, T.y, x0, y0)
-		var/dist = init_dist
-
+		// Using this pattern, block will flow out from blocking turfs, essentially caching the recursion
+		// This is safe because if get_step_towards is ever anything but caridnally off, it'll do a diagonal move
+		// So we always sample from a "loop" closer
+		// It's kind of behaviorly unimpressive that that's a problem for the future
 		if(reactionary)
-			var/turf/Trajectory = T
-			while(Trajectory != epicenter)
-				Trajectory = get_step_towards(Trajectory, epicenter)
-				dist += cached_exp_block[Trajectory]
+			if(explode == epicenter)
+				cached_exp_block[explode] = explode.explosive_resistance
+			else
+				var/our_block = cached_exp_block[get_step_towards(explode, epicenter)]
+				dist += our_block
+				cached_exp_block[explode] = our_block + explode.explosive_resistance

-		var/flame_dist = dist < flame_range
-		var/throw_dist = dist

+		var/severity = EXPLODE_NONE
 		if(dist < devastation_range)
-			dist = EXPLODE_DEVASTATE
+			severity = EXPLODE_DEVASTATE
 		else if(dist < heavy_impact_range)
-			dist = EXPLODE_HEAVY
+			severity = EXPLODE_HEAVY
 		else if(dist < light_impact_range)
-			dist = EXPLODE_LIGHT
-		else
-			dist = EXPLODE_NONE
+			severity = EXPLODE_LIGHT

-		if(T == epicenter) // Ensures explosives detonating from bags trigger other explosives in that bag
+		if(explode == epicenter) // Ensures explosives detonating from bags trigger other explosives in that bag
 			var/list/items = list()
-			for(var/I in T)
-				var/atom/A = I
-				if (length(A.contents) && !(A.flags_1 & PREVENT_CONTENTS_EXPLOSION_1)) //The atom/contents_explosion() proc returns null if the contents ex_acting has been handled by the atom, and TRUE if it hasn't.
-					items += A.get_all_contents(ignore_flag_1 = PREVENT_CONTENTS_EXPLOSION_1)
-				if(isliving(A))
-					items -= A		//Stops mobs from taking double damage from explosions originating from them/their turf, such as from projectiles
-			for(var/thing in items)
-				var/atom/movable/movable_thing = thing
-				if(QDELETED(movable_thing))
-					continue
-				switch(dist)
-					if(EXPLODE_DEVASTATE)
-						SSexplosions.high_mov_atom += movable_thing
-					if(EXPLODE_HEAVY)
-						SSexplosions.med_mov_atom += movable_thing
-					if(EXPLODE_LIGHT)
-						SSexplosions.low_mov_atom += movable_thing
-		switch(dist)
+			for(var/atom/holder as anything in explode)
+				if (length(holder.contents) && !(holder.flags_1 & PREVENT_CONTENTS_EXPLOSION_1)) //The atom/contents_explosion() proc returns null if the contents ex_acting has been handled by the atom, and TRUE if it hasn't.
+					items += holder.get_all_contents(ignore_flag_1 = PREVENT_CONTENTS_EXPLOSION_1)
+				if(isliving(holder))
+					items -= holder		//Stops mobs from taking double damage from explosions originating from them/their turf, such as from projectiles
+			switch(severity)
+				if(EXPLODE_DEVASTATE)
+					SSexplosions.high_mov_atom += items
+				if(EXPLODE_HEAVY)
+					SSexplosions.med_mov_atom += items
+				if(EXPLODE_LIGHT)
+					SSexplosions.low_mov_atom += items
+		switch(severity)
 			if(EXPLODE_DEVASTATE)
-				SSexplosions.highturf += T
+				SSexplosions.highturf += explode
 			if(EXPLODE_HEAVY)
-				SSexplosions.medturf += T
+				SSexplosions.medturf += explode
 			if(EXPLODE_LIGHT)
-				SSexplosions.lowturf += T
+				SSexplosions.lowturf += explode
+		
 		//SKYRAT EDIT ADDITION
-		for(var/obj/machinery/light/iterating_light in T)
+		for(var/obj/machinery/light/iterating_light in explode)
 			iterating_light.start_flickering()
 		//SKYRAT EDIT END
-		if(flame_dist && prob(40) && !isspaceturf(T) && !T.density)
-			flameturf += T
+
+		if(prob(40) && dist < flame_range && !isspaceturf(explode) && !explode.density)
+			flameturf += explode

 		//--- THROW ITEMS AROUND ---
-		var/throw_dir = get_dir(epicenter,T)
-		var/throw_range = max_range-throw_dist
-		var/list/throwingturf = T.explosion_throw_details
-		if (throwingturf)
-			if (throwingturf[1] < throw_range)
-				throwingturf[1] = throw_range
-				throwingturf[2] = throw_dir
+		if (explode.explosion_throw_details)
+			var/list/throwingturf = explode.explosion_throw_details
+			if (throwingturf[1] < max_range - dist)
+				throwingturf[1] = max_range - dist
+				throwingturf[2] = get_dir(epicenter, explode)
 				throwingturf[3] = max_range
 		else
-			T.explosion_throw_details = list(throw_range, throw_dir, max_range)
-			throwturf += T
+			explode.explosion_throw_details = list(max_range - dist, get_dir(epicenter, explode), max_range)
+			throwturf += explode


 	var/took = (REALTIMEOFDAY - started_at) / 10
@@ -593,68 +592,40 @@ SUBSYSTEM_DEF(explosions)
 #undef FREQ_UPPER
 #undef FREQ_LOWER

-/datum/controller/subsystem/explosions/proc/GatherSpiralTurfs(range, turf/epicenter)
+/// Returns a list of turfs in X range from the epicenter
+/// Returns in a unique order, spiraling outwards
+/// This is done to ensure our progressive cache of blast resistance is always valid
+/// This is quite fast
+/proc/prepare_explosion_turfs(range, turf/epicenter)
 	var/list/outlist = list()
-	var/center = epicenter
-	var/dist = range
-	if(!dist)
-		outlist += center
-		return outlist
+	// Add in the center
+	outlist += epicenter

-	var/turf/t_center = get_turf(center)
-	if(!t_center)
-		return outlist
+	var/our_x = epicenter.x
+	var/our_y = epicenter.y
+	var/our_z = epicenter.z

-	var/list/L = outlist
-	var/turf/T
-	var/y
-	var/x
-	var/c_dist = 1
-	L += t_center
+	var/max_x = world.maxx
+	var/max_y = world.maxy
+	for(var/i in 1 to range)
+		var/lowest_x = our_x - i
+		var/lowest_y = our_y - i
+		var/highest_x = our_x + i
+		var/highest_y = our_y + i
+		// top left to one before top right
+		if(highest_y <= max_y)
+			outlist += block(locate(max(lowest_x, 1), highest_y, our_z), locate(min(highest_x - 1, max_x), highest_y, our_z))
+		// top right to one before bottom right
+		if(highest_x <= max_x)
+			outlist += block(locate(highest_x, min(highest_y, max_y), our_z), locate(highest_x, max(lowest_y + 1, 1), our_z))
+		// bottom right to one before bottom left
+		if(lowest_y >= 1)
+			outlist += block(locate(min(highest_x, max_x), lowest_y, our_z), locate(max(lowest_x + 1, 1), lowest_y, our_z))
+		// bottom left to one before top left
+		if(lowest_x >= 1)
+			outlist += block(locate(lowest_x, max(lowest_y, 1), our_z), locate(lowest_x, min(highest_y - 1, max_y), our_z))

-	while( c_dist <= dist )
-		y = t_center.y + c_dist
-		x = t_center.x - c_dist + 1
-		for(x in x to t_center.x+c_dist)
-			T = locate(x,y,t_center.z)
-			if(T)
-				L += T
-
-		y = t_center.y + c_dist - 1
-		x = t_center.x + c_dist
-		for(y in t_center.y-c_dist to y)
-			T = locate(x,y,t_center.z)
-			if(T)
-				L += T
-
-		y = t_center.y - c_dist
-		x = t_center.x + c_dist - 1
-		for(x in t_center.x-c_dist to x)
-			T = locate(x,y,t_center.z)
-			if(T)
-				L += T
-
-		y = t_center.y - c_dist + 1
-		x = t_center.x - c_dist
-		for(y in y to t_center.y+c_dist)
-			T = locate(x,y,t_center.z)
-			if(T)
-				L += T
-		c_dist++
-	. = L
-
-/datum/controller/subsystem/explosions/proc/CaculateExplosionBlock(list/affected_turfs)
-	. = list()
-	var/I
-	for(I in 1 to affected_turfs.len) // we cache the explosion block rating of every turf in the explosion area
-		var/turf/T = affected_turfs[I]
-		var/current_exp_block = T.density ? T.explosion_block : 0
-
-		for(var/obj/O in T)
-			var/the_block = O.explosion_block
-			current_exp_block += the_block == EXPLOSION_BLOCK_PROC ? O.GetExplosionBlock() : the_block
-
-		.[T] = current_exp_block
+	return outlist

 /datum/controller/subsystem/explosions/fire(resumed = 0)
 	if (!is_exploding())
@@ -743,15 +714,15 @@ SUBSYSTEM_DEF(explosions)
 		for (var/thing in throw_turf)
 			if (!thing)
 				continue
-			var/turf/T = thing
-			var/list/L = T.explosion_throw_details
-			T.explosion_throw_details = null
-			if (length(L) != 3)
+			var/turf/explode = thing
+			var/list/details = explode.explosion_throw_details
+			explode.explosion_throw_details = null
+			if (length(details) != 3)
 				continue
-			var/throw_range = L[1]
-			var/throw_dir = L[2]
-			var/max_range = L[3]
-			for(var/atom/movable/A in T)
+			var/throw_range = details[1]
+			var/throw_dir = details[2]
+			var/max_range = details[3]
+			for(var/atom/movable/A in explode)
 				if(QDELETED(A))
 					continue
 				if(!A.anchored && A.move_resist != INFINITY)
@@ -0,0 +1,111 @@
+/// Namespace for housing code relating to giving contextual tutorials to users.
+SUBSYSTEM_DEF(tutorials)
+	name = "Tutorials"
+	flags = SS_NO_FIRE
+
+	/// A mapping of /datum/tutorial type to their manager singleton.
+	/// You probably shouldn't be indexing this directly.
+	var/list/datum/tutorial_manager/tutorial_managers = list()
+
+	VAR_PRIVATE/list/datum/tutorial_manager/tutorial_managers_by_key = list()
+
+/datum/controller/subsystem/tutorials/Initialize()
+	init_tutorial_managers()
+	load_initial_tutorial_completions()
+	RegisterSignal(SSdcs, COMSIG_GLOB_CLIENT_CONNECT, PROC_REF(on_client_connect))
+
+	return SS_INIT_SUCCESS
+
+/// Will suggest the passed tutorial type to the user.
+/// Will check that they should actually see it, e.g. hasn't completed it yet, etc.
+/// Then, calls `/datum/tutorial/subtype/perform` with the extra arguments passed in.
+/datum/controller/subsystem/tutorials/proc/suggest_tutorial(mob/user, datum/tutorial/tutorial_type, ...)
+	var/datum/tutorial_manager/tutorial_manager = tutorial_managers[tutorial_type]
+	if (isnull(tutorial_manager))
+		CRASH("[tutorial_type] is not a valid tutorial type")
+
+	if (!tutorial_manager.should_run(user))
+		return
+
+	INVOKE_ASYNC(tutorial_manager, TYPE_PROC_REF(/datum/tutorial_manager, try_perform), user, args.Copy(3))
+
+/datum/controller/subsystem/tutorials/proc/init_tutorial_managers()
+	PRIVATE_PROC(TRUE)
+
+	for (var/datum/tutorial/tutorial_type as anything in subtypesof(/datum/tutorial))
+		var/datum/tutorial_manager/tutorial_manager = new /datum/tutorial_manager(tutorial_type)
+		tutorial_managers[tutorial_type] = tutorial_manager
+		tutorial_managers_by_key[tutorial_manager.get_key()] = tutorial_manager
+
+/datum/controller/subsystem/tutorials/proc/load_initial_tutorial_completions()
+	PRIVATE_PROC(TRUE)
+	set waitfor = FALSE // There's no reason to halt init for this
+
+	var/list/ckey_options = list()
+	var/list/ckeys = list()
+
+	for (var/client/client as anything in GLOB.clients)
+		var/ckey = client?.ckey
+		if (!ckey)
+			continue // client shenanigans, never trust
+
+		var/index = ckeys.len + 1
+		ckey_options += ":ckey[index]"
+		ckeys["ckey[index]"] = ckey
+
+	if (ckey_options.len == 0)
+		return
+
+	var/datum/db_query/select_all_query = SSdbcore.NewQuery(
+		"SELECT ckey, tutorial_key FROM [format_table_name("tutorial_completions")] WHERE ckey in ([ckey_options.Join(", ")])",
+		ckeys,
+	)
+
+	if (!select_all_query.Execute())
+		qdel(select_all_query)
+		return
+
+	while (select_all_query.NextRow())
+		var/ckey = select_all_query.item[1]
+		var/tutorial_key = select_all_query.item[2]
+
+		mark_ckey_completed_tutorial(ckey, tutorial_key)
+
+	qdel(select_all_query)
+
+/datum/controller/subsystem/tutorials/proc/on_client_connect(datum/source, client/client)
+	SIGNAL_HANDLER
+
+	var/ckey = client.ckey
+	if (!ckey)
+		return
+
+	INVOKE_ASYNC(src, PROC_REF(check_completed_tutorials_for_ckey), ckey)
+
+/datum/controller/subsystem/tutorials/proc/check_completed_tutorials_for_ckey(ckey)
+	if (!SSdbcore.IsConnected())
+		return
+
+	var/datum/db_query/select_tutorials_for_ckey = SSdbcore.NewQuery(
+		"SELECT tutorial_key FROM [format_table_name("tutorial_completions")] WHERE ckey = :ckey",
+		list("ckey" = ckey)
+	)
+
+	if (!select_tutorials_for_ckey.Execute())
+		return
+
+	while (select_tutorials_for_ckey.NextRow())
+		var/tutorial_key = select_tutorials_for_ckey.item[1]
+
+		mark_ckey_completed_tutorial(ckey, tutorial_key)
+
+	qdel(select_tutorials_for_ckey)
+
+/datum/controller/subsystem/tutorials/proc/mark_ckey_completed_tutorial(ckey, tutorial_key)
+	var/datum/tutorial_manager/tutorial_manager = tutorial_managers_by_key[tutorial_key]
+	if (isnull(tutorial_manager))
+		// Not necessarily a bug.
+		// Could be an outdated server or a removed tutorial.
+		return
+
+	tutorial_manager.mark_as_completed(ckey)
@@ -127,6 +127,7 @@
 /datum/component/drift/proc/loop_death(datum/source)
 	SIGNAL_HANDLER
 	drifting_loop = null
+	UnregisterSignal(parent, COMSIG_MOVABLE_NEWTONIAN_MOVE) // We won't block a component from replacing us anymore

 /datum/component/drift/proc/handle_move(datum/source, old_loc)
 	SIGNAL_HANDLER
@@ -173,7 +173,7 @@
 		return // blocked wield from item
 	wielded = TRUE
 	ADD_TRAIT(parent, TRAIT_WIELDED, REF(src))
-	RegisterSignal(user, COMSIG_MOB_SWAP_HANDS, PROC_REF(on_swap_hands))
+	RegisterSignal(user, COMSIG_MOB_SWAPPING_HANDS, PROC_REF(on_swapping_hands))
 	wield_callback?.Invoke(parent, user)

 	// update item stats and name
@@ -307,7 +307,7 @@
 /**
 * on_swap_hands Triggers on swapping hands, blocks swap if the other hand is busy
 */
-/datum/component/two_handed/proc/on_swap_hands(mob/user, obj/item/held_item)
+/datum/component/two_handed/proc/on_swapping_hands(mob/user, obj/item/held_item)
 	SIGNAL_HANDLER

 	if(!held_item)
@@ -0,0 +1,56 @@
+/// Apply this element to a movable atom when you want it to block explosions
+/// It will mirror the blocking down to that movable's turf, keeping explosion work cheap
+/datum/element/blocks_explosives
+
+/datum/element/blocks_explosives/Attach(datum/target)
+	if(!ismovable(target))
+		return
+	. = ..()
+	ADD_TRAIT(target, TRAIT_BLOCKING_EXPLOSIVES, TRAIT_GENERIC)
+	var/atom/movable/moving_target = target
+	RegisterSignal(moving_target, COMSIG_MOVABLE_MOVED, PROC_REF(blocker_moved))
+	RegisterSignal(moving_target, COMSIG_MOVABLE_EXPLOSION_BLOCK_CHANGED, PROC_REF(blocking_changed))
+	moving_target.explosive_resistance = moving_target.explosion_block
+
+	if(length(moving_target.locs) > 1)
+		for(var/atom/location as anything in moving_target.locs)
+			block_loc(location, moving_target.explosion_block)
+	else if(moving_target.loc)
+		block_loc(moving_target.loc, moving_target.explosion_block)
+
+/datum/element/blocks_explosives/Detach(datum/source)
+	. = ..()
+	REMOVE_TRAIT(source, TRAIT_BLOCKING_EXPLOSIVES, TRAIT_GENERIC)
+
+/// Call this when our blocking well, changes. we'll update our turf(s) with the details
+/datum/element/blocks_explosives/proc/blocking_changed(atom/movable/target, old_block, new_block)
+	if(length(target.locs) > 1)
+		for(var/atom/location as anything in target.locs)
+			unblock_loc(location, old_block)
+			block_loc(location, new_block)
+	else if(target.loc)
+		unblock_loc(target.loc, old_block)
+		block_loc(target.loc, new_block)
+
+/// Applies a block amount to a turf. proc for convenince
+/datum/element/blocks_explosives/proc/block_loc(atom/location, block_amount)
+	location.explosive_resistance += block_amount
+
+/// Removes a block amount from a turf. proc for convenince
+/datum/element/blocks_explosives/proc/unblock_loc(atom/location, block_amount)
+	location.explosive_resistance -= block_amount
+
+/// Essentially just blocking_changed except we remove from the old loc, and add to the new one
+/datum/element/blocks_explosives/proc/blocker_moved(atom/movable/target, atom/old_loc, dir, forced, list/old_locs)
+	if(length(old_locs) > 1)
+		for(var/atom/location as anything in old_locs)
+			unblock_loc(location, target.explosion_block)
+	else if(old_loc)
+		unblock_loc(old_loc, target.explosion_block)
+
+	if(length(target.locs) > 1)
+		for(var/atom/location as anything in target.locs)
+			block_loc(location, target.explosion_block)
+	else if(target.loc)
+		block_loc(target.loc, target.explosion_block)
+
@@ -76,6 +76,9 @@
 		if(available - the_stack.amount < 0)
 			return FALSE

+	else if(istype(to_insert, /obj/item/circuitboard/machine) || istype(to_insert, /obj/item/circuitboard/computer))
+		return TRUE
+
 	//check normal insertion of other stock parts
 	else if(!to_insert.get_part_rating())
 		return FALSE
@@ -39,8 +39,8 @@
 	///HUD images that this atom can provide.
 	var/list/hud_possible

-	///Value used to increment ex_act() if reactionary_explosions is on
-	var/explosion_block = 0
+	///How much this atom resists explosions by, in the end
+	var/explosive_resistance = 0

 	/**
 	 * used to store the different colors on an atom
@@ -1879,6 +1879,10 @@

 	pixel_y = pixel_y + base_pixel_y - .

+// Not a valid operation, turfs and movables handle block differently
+/atom/proc/set_explosion_block(explosion_block)
+	return
+
 /**
 * Returns true if this atom has gravity for the passed in turf
 *
@@ -96,6 +96,10 @@

 	/// Whether a user will face atoms on entering them with a mouse. Despite being a mob variable, it is here for performances //SKYRAT EDIT ADDITION
 	var/face_mouse = FALSE //SKYRAT EDIT ADDITION
+	/// Value used to increment ex_act() if reactionary_explosions is on
+	/// How much we as a source block explosions by
+	/// Will not automatically apply to the turf below you, you need to apply /datum/element/block_explosives in conjunction with this
+	var/explosion_block = 0

 /mutable_appearance/emissive_blocker

@@ -107,6 +111,11 @@

 /atom/movable/Initialize(mapload)
 	. = ..()
+#ifdef UNIT_TESTS
+	if(explosion_block && !HAS_TRAIT(src, TRAIT_BLOCKING_EXPLOSIVES))
+		stack_trace("[type] blocks explosives, but does not have the managing element applied")
+#endif
+
 	switch(blocks_emissive)
 		if(EMISSIVE_BLOCK_GENERIC)
 			var/static/mutable_appearance/emissive_blocker/blocker = new()
@@ -518,7 +527,7 @@
 	if(set_dir_on_move && dir != direction && !face_mouse) // SKYRAT EDIT CHANGE
 		setDir(direction)

-	var/is_multi_tile_object = bound_width > 32 || bound_height > 32
+	var/is_multi_tile_object = is_multi_tile_object(src)

 	var/list/old_locs
 	if(is_multi_tile_object && isturf(loc))
@@ -1135,6 +1144,13 @@

 	return TRUE

+/atom/movable/set_explosion_block(explosion_block)
+	var/old_block = src.explosion_block
+	explosive_resistance -= old_block
+	src.explosion_block = explosion_block
+	explosive_resistance += explosion_block
+	SEND_SIGNAL(src, COMSIG_MOVABLE_EXPLOSION_BLOCK_CHANGED, old_block, explosion_block)
+
 /atom/movable/proc/throw_impact(atom/hit_atom, datum/thrownthing/throwingdatum)
 	set waitfor = FALSE
 	var/hitpush = TRUE
@@ -55,10 +55,10 @@
 /datum/atom_hud/data/diagnostic

 /datum/atom_hud/data/diagnostic/basic
-	hud_icons = list(DIAG_HUD, DIAG_STAT_HUD, DIAG_BATT_HUD, DIAG_MECH_HUD, DIAG_BOT_HUD, DIAG_CIRCUIT_HUD, DIAG_TRACK_HUD, DIAG_CAMERA_HUD, DIAG_AIRLOCK_HUD, DIAG_LAUNCHPAD_HUD)
+	hud_icons = list(DIAG_HUD, DIAG_STAT_HUD, DIAG_BATT_HUD, DIAG_MECH_HUD, DIAG_BOT_HUD, DIAG_TRACK_HUD, DIAG_CAMERA_HUD, DIAG_AIRLOCK_HUD, DIAG_LAUNCHPAD_HUD)

 /datum/atom_hud/data/diagnostic/advanced
-	hud_icons = list(DIAG_HUD, DIAG_STAT_HUD, DIAG_BATT_HUD, DIAG_MECH_HUD, DIAG_BOT_HUD, DIAG_CIRCUIT_HUD, DIAG_TRACK_HUD, DIAG_CAMERA_HUD, DIAG_AIRLOCK_HUD, DIAG_LAUNCHPAD_HUD, DIAG_PATH_HUD)
+	hud_icons = list(DIAG_HUD, DIAG_STAT_HUD, DIAG_BATT_HUD, DIAG_MECH_HUD, DIAG_BOT_HUD, DIAG_TRACK_HUD, DIAG_CAMERA_HUD, DIAG_AIRLOCK_HUD, DIAG_LAUNCHPAD_HUD, DIAG_PATH_HUD)

 /datum/atom_hud/data/bot_path
 	// This hud exists so the bot can see itself, that's all
@@ -101,6 +101,37 @@
 		amt += req_components[path]
 	return amt

+/**
+ * install the circuitboard in this frame
+ * * board - the machine circuitboard to install
+ * * user - the player
+ * * by_hand - is the player installing the board by hand or from the RPED. Used to decide how to transfer the board into the frame
+ */
+/obj/structure/frame/machine/proc/install_board(obj/item/circuitboard/machine/board, mob/user, by_hand)
+	if(!board.build_path)
+		to_chat(user, span_warning("This circuitboard seems to be broken."))
+		return
+	if(!anchored && board.needs_anchored)
+		to_chat(user, span_warning("The frame needs to be secured first!"))
+		return
+	if(by_hand && !user.transferItemToLoc(board, src))
+		return
+	else if(!board.forceMove(src))
+		return
+
+	playsound(src.loc, 'sound/items/deconstruct.ogg', 50, TRUE)
+	to_chat(user, span_notice("You add the circuit board to the frame."))
+	circuit = board
+	icon_state = "box_2"
+	state = 3
+	components = list()
+	//add circuit board as the first component to the list of components
+	//required for part_replacer to locate it while exchanging parts so it does not early return in /obj/machinery/proc/exchange_parts
+	components += circuit
+	req_components = board.req_components.Copy()
+	update_namelist(board.specific_parts)
+	return TRUE
+
 /obj/structure/frame/machine/attackby(obj/item/P, mob/living/user, params)
 	switch(state)
 		if(1)
@@ -152,27 +183,35 @@
 					set_anchored(!anchored)
 				return

+			if(istype(P, /obj/item/storage/part_replacer) && P.contents.len)
+				var/obj/item/storage/part_replacer/replacer = P
+				// map of circuitboard names to the board
+				var/list/circuit_boards = list()
+				for(var/obj/item/circuitboard/machine/board in replacer.contents)
+					circuit_boards[board.name] = board
+				if(!length(circuit_boards))
+					return
+				//if there is only one board directly install it else pick from list
+				var/obj/item/circuitboard/machine/target_board
+				if(circuit_boards.len == 1)
+					for(var/board_name in circuit_boards)
+						target_board = circuit_boards[board_name]
+				else
+					var/option = tgui_input_list(user, "Select Circuitboard To Install"," Available Boards", circuit_boards)
+					target_board = circuit_boards[option]
+					if(!target_board)
+						return
+				//install board
+				if(install_board(target_board, user, FALSE))
+					user.Beam(src, icon_state = "rped_upgrade", time = 5)
+					replacer.play_rped_sound()
+					//attack this frame again with the rped so it can install stock parts since its now in state 3
+					attackby(replacer, user, params)
+					return
+
 			if(istype(P, /obj/item/circuitboard/machine))
-				var/obj/item/circuitboard/machine/board = P
-				if(!board.build_path)
-					to_chat(user, span_warning("This circuitboard seems to be broken."))
-					return
-				if(!anchored && board.needs_anchored)
-					to_chat(user, span_warning("The frame needs to be secured first!"))
-					return
-				if(!user.transferItemToLoc(board, src))
-					return
-				playsound(src.loc, 'sound/items/deconstruct.ogg', 50, TRUE)
-				to_chat(user, span_notice("You add the circuit board to the frame."))
-				circuit = board
-				icon_state = "box_2"
-				state = 3
-				components = list()
-				//add circuit board as the first component to the list of components
-				//required for part_replacer to locate it while exchanging parts so it does not early return in /obj/machinery/proc/exchange_parts
-				components += circuit
-				req_components = board.req_components.Copy()
-				update_namelist(board.specific_parts)
+				var/obj/item/circuitboard/machine/machine_board = P
+				install_board(machine_board, user, TRUE)
 				return

 			else if(istype(P, /obj/item/circuitboard))
@@ -251,7 +290,14 @@
 					qdel(src)
 				return

-			if(istype(P, /obj/item/storage/part_replacer) && P.contents.len && get_req_components_amt())
+			if(istype(P, /obj/item/storage/part_replacer))
+				/**
+				 * more efficient return so no if conditions after this are executed.
+				 * Required when the rped is re attacking the frame after installing circuitboard so it returns quickly
+				 */
+				if(!P.contents.len || !get_req_components_amt())
+					return
+
 				var/obj/item/storage/part_replacer/replacer = P
 				var/list/added_components = list()
 				var/list/part_list = replacer.get_sorted_parts() //parts sorted in order of tier
@@ -55,6 +55,7 @@
 	acid = 70

 /obj/machinery/door/Initialize(mapload)
+	AddElement(/datum/element/blocks_explosives)
 	. = ..()
 	set_init_door_layer()
 	update_freelook_sight()
@@ -70,7 +71,7 @@

 	//doors only block while dense though so we have to use the proc
 	real_explosion_block = explosion_block
-	explosion_block = EXPLOSION_BLOCK_PROC
+	update_explosive_block()
 	RegisterSignal(SSsecurity_level, COMSIG_SECURITY_LEVEL_CHANGED, PROC_REF(check_security_level))

 	var/static/list/loc_connections = list(
@@ -501,9 +502,6 @@
 	//if it blows up a wall it should blow up a door
 	return ..(severity ? min(EXPLODE_DEVASTATE, severity + 1) : EXPLODE_NONE, target)

-/obj/machinery/door/GetExplosionBlock()
-	return density ? real_explosion_block : 0
-
 /obj/machinery/door/power_change()
 	. = ..()
 	if(. && !(machine_stat & NOPOWER))
@@ -519,4 +517,19 @@

 	INVOKE_ASYNC(src, PROC_REF(open))

+/obj/machinery/door/set_density(new_value)
+	. = ..()
+	update_explosive_block()
+
+/obj/machinery/door/proc/update_explosive_block()
+	set_explosion_block(real_explosion_block)
+
+// Kinda roundabout, essentially if we're dense, we respect real_explosion_block
+// Otherwise, we block nothing
+/obj/machinery/door/set_explosion_block(explosion_block)
+	real_explosion_block = explosion_block
+	if(density)
+		return ..()
+	return ..(0)
+
 #undef DOOR_CLOSE_WAIT
@@ -678,6 +678,7 @@ GLOBAL_DATUM_INIT(fire_overlay, /mutable_appearance, mutable_appearance('icons/e
 /obj/item/proc/pickup(mob/user)
 	SHOULD_CALL_PARENT(TRUE)
 	SEND_SIGNAL(src, COMSIG_ITEM_PICKUP, user)
+	SEND_SIGNAL(user, COMSIG_LIVING_PICKED_UP_ITEM, src)
 	item_flags |= IN_INVENTORY

 /// called when "found" in pockets and storage items. Returns 1 if the search should end.
@@ -1054,7 +1054,7 @@ GLOBAL_VAR_INIT(icon_holographic_window, init_holographic_window())
 							if(istype(O))
 								var/x0 = O.x
 								var/y0 = O.y
-								var/contender = cheap_hypotenuse(start.x, start.y, x0, y0)
+								var/contender = CHEAP_HYPOTENUSE(start.x, start.y, x0, y0)
 								if(!winner)
 									winner = O
 									winning_dist = contender
@@ -45,8 +45,8 @@
 	name = "retro identification card"
 	desc = "A card used to provide ID and determine access across the station."
 	icon_state = "card_grey"
-	worn_icon_state = "card_retro"
 	inhand_icon_state = "card-id"
+	worn_icon_state = "nothing"
 	lefthand_file = 'icons/mob/inhands/equipment/idcards_lefthand.dmi'
 	righthand_file = 'icons/mob/inhands/equipment/idcards_righthand.dmi'
 	slot_flags = ITEM_SLOT_ID
@@ -897,7 +897,6 @@
 	name = "identification card"
 	desc = "A card used to provide ID and determine access across the station. Has an integrated digital display and advanced microchips."
 	icon_state = "card_grey"
-	worn_icon_state = "card_grey"

 	wildcard_slots = WILDCARD_LIMIT_GREY
 	flags_1 = UNPAINTABLE_1
@@ -1059,13 +1058,11 @@
 	name = "rainbow identification card"
 	desc = "A rainbow card, promoting fun in a 'business proper' sense!"
 	icon_state = "card_rainbow"
-	worn_icon_state = "card_rainbow"

 /obj/item/card/id/advanced/silver
 	name = "silver identification card"
 	desc = "A silver card which shows honour and dedication."
 	icon_state = "card_silver"
-	worn_icon_state = "card_silver"
 	inhand_icon_state = "silver_id"
 	assigned_icon_state = "assigned_silver"
 	wildcard_slots = WILDCARD_LIMIT_SILVER
@@ -1084,7 +1081,6 @@
 	name = "gold identification card"
 	desc = "A golden card which shows power and might."
 	icon_state = "card_gold"
-	worn_icon_state = "card_gold"
 	inhand_icon_state = "gold_id"
 	assigned_icon_state = "assigned_gold"
 	wildcard_slots = WILDCARD_LIMIT_GOLD
@@ -1119,7 +1115,6 @@
 	name = "\improper CentCom ID"
 	desc = "An ID straight from Central Command."
 	icon_state = "card_centcom"
-	worn_icon_state = "card_centcom"
 	assigned_icon_state = "assigned_centcom"
 	registered_name = JOB_CENTCOM
 	registered_age = null
@@ -1165,7 +1160,6 @@
 	name = "black identification card"
 	desc = "This card is telling you one thing and one thing alone. The person holding this card is an utter badass."
 	icon_state = "card_black"
-	worn_icon_state = "card_black"
 	assigned_icon_state = "assigned_syndicate"
 	wildcard_slots = WILDCARD_LIMIT_GOLD

@@ -1219,7 +1213,6 @@
 	name = "\improper Debug ID"
 	desc = "A debug ID card. Has ALL the all access, you really shouldn't have this."
 	icon_state = "card_centcom"
-	worn_icon_state = "card_centcom"
 	assigned_icon_state = "assigned_centcom"
 	trim = /datum/id_trim/admin
 	wildcard_slots = WILDCARD_LIMIT_ADMIN
@@ -1236,7 +1229,6 @@
 	name = "prisoner ID card"
 	desc = "You are a number, you are not a free man."
 	icon_state = "card_prisoner"
-	worn_icon_state = "card_prisoner"
 	inhand_icon_state = "orange-id"
 	lefthand_file = 'icons/mob/inhands/equipment/idcards_lefthand.dmi'
 	righthand_file = 'icons/mob/inhands/equipment/idcards_righthand.dmi'
@@ -1353,7 +1345,6 @@
 	registered_name = "Highlander"
 	desc = "There can be only one!"
 	icon_state = "card_black"
-	worn_icon_state = "card_black"
 	assigned_icon_state = "assigned_syndicate"
 	trim = /datum/id_trim/highlander
 	wildcard_slots = WILDCARD_LIMIT_ADMIN
@@ -1664,7 +1655,6 @@
 /// A special variant of the classic chameleon ID card which accepts all access.
 /obj/item/card/id/advanced/chameleon/black
 	icon_state = "card_black"
-	worn_icon_state = "card_black"
 	assigned_icon_state = "assigned_syndicate"
 	wildcard_slots = WILDCARD_LIMIT_GOLD

@@ -204,6 +204,7 @@
 	desc = "A hand-held long-range environmental scanner which reports current gas levels."
 	name = "long-range gas analyzer"
 	icon_state = "analyzerranged"
+	worn_icon_state = "analyzer"
 	w_class = WEIGHT_CLASS_NORMAL
 	custom_materials = list(/datum/material/iron = 100, /datum/material/glass = 20, /datum/material/gold = 300, /datum/material/bluespace=200)
 	grind_results = list(/datum/reagent/mercury = 5, /datum/reagent/iron = 5, /datum/reagent/silicon = 5)
@@ -145,7 +145,7 @@
 	desc = "An ominous card that contains the location of the station, and when applied to a communications console, \
 	the ability to long-distance contact the Syndicate fleet."
 	icon_state = "battlecruisercaller"
-	worn_icon_state = "battlecruisercaller"
+	worn_icon_state = "emag"
 	///whether we have called the battlecruiser
 	var/used = FALSE
 	/// The battlecruiser team that the battlecruiser will get added to
@@ -240,6 +240,7 @@
 	acid = 100

 /obj/structure/light_puzzle/Initialize(mapload)
+	AddElement(/datum/element/blocks_explosives)
 	. = ..()
 	var/generated_board = -1
 	while(generated_board in banned_combinations)
@@ -272,6 +272,7 @@
 	name = "Crusader's Hood"
 	desc = "A brownish hood."
 	icon = 'icons/obj/clothing/head/chaplain.dmi'
+	worn_icon = 'icons/mob/clothing/head/chaplain.dmi'
 	icon_state = "crusader"
 	inhand_icon_state = null
 	w_class = WEIGHT_CLASS_NORMAL
@@ -300,6 +301,7 @@
 	name = "Prophet's Hat"
 	desc = "A religious-looking hat."
 	icon_state = null
+	worn_icon = 'icons/mob/clothing/head/helmet.dmi'
 	inhand_icon_state = null
 	flags_1 = 0
 	armor_type = /datum/armor/crusader_prophet
@@ -208,7 +208,8 @@ MAPPING_DIRECTIONAL_HELPERS(/obj/item/storage/secure/safe, 32)
 	name = "captain's spare ID safe"
 	desc = "In case of emergency, do not break glass. All Captains and Acting Captains are provided with codes to access this safe. \
 It is made out of the same material as the station's Black Box and is designed to resist all conventional weaponry. \
-There appears to be a small amount of surface corrosion. It doesn't look like it could withstand much of an explosion."
+There appears to be a small amount of surface corrosion. It doesn't look like it could withstand much of an explosion.\
+It remains quite flush against the wall, and there only seems to be enough room to fit something as slim as an ID card."
 	can_hack_open = FALSE
 	armor_type = /datum/armor/safe_caps_spare
 	max_integrity = 300
@@ -227,6 +228,7 @@ MAPPING_DIRECTIONAL_HELPERS(/obj/item/storage/secure/safe/caps_spare, 32)

 /obj/item/storage/secure/safe/caps_spare/Initialize(mapload)
 	. = ..()
+	atom_storage.set_holdable(can_hold_list = list(/obj/item/card/id))
 	lock_code = SSid_access.spare_id_safe_code
 	lock_set = TRUE
 	atom_storage.locked = TRUE
@@ -154,6 +154,7 @@

 /obj/item/storage/wallet/random
 	icon_state = "random_wallet" // for mapping purposes
+	worn_icon_state = "wallet"

 /obj/item/storage/wallet/random/Initialize(mapload)
 	. = ..()
@@ -335,6 +335,7 @@ LINEN BINS
 	name = "random bedsheet"
 	desc = "If you're reading this description ingame, something has gone wrong! Honk!"
 	bedsheet_type = BEDSHEET_ABSTRACT
+	item_flags = ABSTRACT
 	var/static/list/bedsheet_list
 	var/spawn_type = BEDSHEET_SINGLE

@@ -360,6 +361,7 @@ LINEN BINS
 	name = "random dorms bedsheet"
 	desc = "If you're reading this description ingame, something has gone wrong! Honk!"
 	bedsheet_type = BEDSHEET_DOUBLE
+	item_flags = ABSTRACT
 	slot_flags = null

 /obj/item/bedsheet/dorms/Initialize(mapload)
@@ -541,6 +543,7 @@ LINEN BINS

 /obj/item/bedsheet/dorms_double
 	icon_state = "random_bedsheet"
+	item_flags = ABSTRACT
 	bedsheet_type = BEDSHEET_ABSTRACT

 /obj/item/bedsheet/dorms_double/Initialize(mapload)
@@ -40,6 +40,7 @@
 	acid = 100

 /obj/structure/window/Initialize(mapload, direct)
+	AddElement(/datum/element/blocks_explosives)
 	. = ..()
 	if(direct)
 		setDir(direct)
@@ -55,9 +56,9 @@
 		setDir()
 		AddElement(/datum/element/can_barricade)

-	//windows only block while reinforced and fulltile, so we'll use the proc
-	real_explosion_block = explosion_block
-	explosion_block = EXPLOSION_BLOCK_PROC
+	//windows only block while reinforced and fulltile
+	if(!reinf || !fulltile)
+		set_explosion_block(0)

 	flags_1 |= ALLOW_DARK_PAINTS_1
 	RegisterSignal(src, COMSIG_OBJ_PAINTED, PROC_REF(on_painted))
@@ -424,9 +425,6 @@

 	return TRUE

-/obj/structure/window/GetExplosionBlock()
-	return reinf && fulltile ? real_explosion_block : 0
-
 /obj/structure/window/spawner/east
 	dir = EAST

@@ -83,6 +83,9 @@ GLOBAL_LIST_INIT(blacklisted_automated_baseturfs, typecacheof(list(
 	//SKYRAT EDIT END
 	var/old_rcd_memory = rcd_memory
 	var/old_always_lit = always_lit
+	var/old_explosion_throw_details = explosion_throw_details
+	// We get just the bits of explosive_resistance that aren't the turf
+	var/old_explosive_resistance = explosive_resistance - get_explosive_block()
 	var/old_lattice_underneath = lattice_underneath

 	var/old_bp = blueprint_data
@@ -122,6 +125,8 @@ GLOBAL_LIST_INIT(blacklisted_automated_baseturfs, typecacheof(list(

 	new_turf.blueprint_data = old_bp
 	new_turf.rcd_memory = old_rcd_memory
+	new_turf.explosion_throw_details = old_explosion_throw_details
+	new_turf.explosive_resistance += old_explosive_resistance

 	lighting_corner_NE = old_lighting_corner_NE
 	lighting_corner_SE = old_lighting_corner_SE
@@ -20,7 +20,7 @@
 	name = "wall"
 	desc = "Effectively impervious to conventional methods of destruction."
 	icon = 'icons/turf/walls.dmi'
-	explosion_block = 50
+	explosive_resistance = 50

 /turf/closed/indestructible/rust_heretic_act()
 	return
@@ -279,7 +279,7 @@ INITIALIZE_IMMEDIATE(/turf/closed/indestructible/splashscreen)
 	desc = "A seemingly impenetrable wall."
 	icon = 'icons/turf/walls.dmi'
 	icon_state = "necro"
-	explosion_block = 50
+	explosive_resistance = 50
 	baseturfs = /turf/closed/indestructible/necropolis

 /turf/closed/indestructible/necropolis/get_smooth_underlay_icon(mutable_appearance/underlay_appearance, turf/asking_turf, adjacency_dir)
@@ -307,7 +307,7 @@ INITIALIZE_IMMEDIATE(/turf/closed/indestructible/splashscreen)
 	smoothing_flags = SMOOTH_BITMASK
 	smoothing_groups = SMOOTH_GROUP_CLOSED_TURFS + SMOOTH_GROUP_BOSS_WALLS
 	canSmoothWith = SMOOTH_GROUP_BOSS_WALLS
-	explosion_block = 50
+	explosive_resistance = 50
 	baseturfs = /turf/closed/indestructible/riveted/boss

 /turf/closed/indestructible/riveted/boss/see_through
@@ -15,7 +15,7 @@
 	base_icon_state = "gold_wall"
 	sheet_type = /obj/item/stack/sheet/mineral/gold
 	hardness = 65 //gold is soft
-	explosion_block = 0 //gold is a soft metal you dingus.
+	explosive_resistance = 0 //gold is a soft metal you dingus.
 	smoothing_groups = SMOOTH_GROUP_GOLD_WALLS + SMOOTH_GROUP_WALLS + SMOOTH_GROUP_CLOSED_TURFS
 	canSmoothWith = SMOOTH_GROUP_GOLD_WALLS
 	custom_materials = list(/datum/material/gold = 4000)
@@ -42,7 +42,7 @@
 	sheet_type = /obj/item/stack/sheet/mineral/diamond
 	hardness = 5 //diamond is very hard
 	slicing_duration = 200   //diamond wall takes twice as much time to slice
-	explosion_block = 3
+	explosive_resistance = 3
 	smoothing_flags = SMOOTH_BITMASK
 	smoothing_groups = SMOOTH_GROUP_DIAMOND_WALLS + SMOOTH_GROUP_WALLS + SMOOTH_GROUP_CLOSED_TURFS
 	canSmoothWith = SMOOTH_GROUP_DIAMOND_WALLS
@@ -72,7 +72,7 @@
 	base_icon_state = "sandstone_wall"
 	sheet_type = /obj/item/stack/sheet/mineral/sandstone
 	hardness = 50 //moh says this is apparently 6-7 on it's scale
-	explosion_block = 0
+	explosive_resistance = 0
 	smoothing_flags = SMOOTH_BITMASK
 	smoothing_groups = SMOOTH_GROUP_SANDSTONE_WALLS + SMOOTH_GROUP_WALLS + SMOOTH_GROUP_CLOSED_TURFS
 	canSmoothWith = SMOOTH_GROUP_SANDSTONE_WALLS
@@ -158,7 +158,7 @@
 	sheet_type = /obj/item/stack/sheet/mineral/wood
 	hardness = 80
 	turf_flags = IS_SOLID
-	explosion_block = 0
+	explosive_resistance = 0
 	smoothing_flags = SMOOTH_BITMASK
 	smoothing_groups = SMOOTH_GROUP_WOOD_WALLS + SMOOTH_GROUP_WALLS + SMOOTH_GROUP_CLOSED_TURFS
 	canSmoothWith = SMOOTH_GROUP_WOOD_WALLS
@@ -215,7 +215,7 @@
 	base_icon_state = "snow_wall"
 	smoothing_flags = SMOOTH_BITMASK
 	hardness = 80
-	explosion_block = 0
+	explosive_resistance = 0
 	slicing_duration = 30
 	sheet_type = /obj/item/stack/sheet/mineral/snow
 	canSmoothWith = null
@@ -236,7 +236,7 @@
 	sheet_type = /obj/item/stack/sheet/mineral/abductor
 	hardness = 10
 	slicing_duration = 200   //alien wall takes twice as much time to slice
-	explosion_block = 3
+	explosive_resistance = 3
 	smoothing_flags = SMOOTH_BITMASK | SMOOTH_DIAGONAL_CORNERS
 	smoothing_groups = SMOOTH_GROUP_ABDUCTOR_WALLS + SMOOTH_GROUP_WALLS + SMOOTH_GROUP_CLOSED_TURFS
 	canSmoothWith = SMOOTH_GROUP_ABDUCTOR_WALLS
@@ -250,7 +250,7 @@
 	icon = 'icons/turf/walls/shuttle_wall.dmi'
 	icon_state = "shuttle_wall-0"
 	base_icon_state = "shuttle_wall"
-	explosion_block = 3
+	explosive_resistance = 3
 	flags_1 = CAN_BE_DIRTY_1
 	flags_ricochet = RICOCHET_SHINY | RICOCHET_HARD
 	sheet_type = /obj/item/stack/sheet/mineral/titanium
@@ -314,7 +314,7 @@
 	icon = 'icons/turf/walls/plastitanium_wall.dmi'
 	icon_state = "plastitanium_wall-0"
 	base_icon_state = "plastitanium_wall"
-	explosion_block = 4
+	explosive_resistance = 4
 	sheet_type = /obj/item/stack/sheet/mineral/plastitanium
 	hardness = 25 //upgrade on titanium
 	smoothing_flags = SMOOTH_BITMASK | SMOOTH_DIAGONAL_CORNERS
@@ -12,7 +12,7 @@
 	sheet_type = /obj/item/stack/sheet/plasteel
 	sheet_amount = 1
 	girder_type = /obj/structure/girder/reinforced
-	explosion_block = 2
+	explosive_resistance = 2
 	rad_insulation = RAD_HEAVY_INSULATION
 	heat_capacity = 312500 //a little over 5 cm thick , 312500 for 1 m by 2.5 m by 0.25 m plasteel wall. also indicates the temperature at wich the wall will melt (currently only able to melt with H/E pipes)
 	///Dismantled state, related to deconstruction.
@@ -233,7 +233,7 @@
 	icon = 'icons/turf/walls/plastitanium_wall.dmi'
 	icon_state = "plastitanium_wall-0"
 	base_icon_state = "plastitanium_wall"
-	explosion_block = 20
+	explosive_resistance = 20
 	sheet_type = /obj/item/stack/sheet/mineral/plastitanium
 	hardness = 25 //plastitanium
 	turf_flags = IS_SOLID
@@ -6,7 +6,7 @@
 	icon = 'icons/turf/walls/wall.dmi'
 	icon_state = "wall-0"
 	base_icon_state = "wall"
-	explosion_block = 1
+	explosive_resistance = 1

 	thermal_conductivity = WALL_HEAT_TRANSFER_COEFFICIENT
 	heat_capacity = 62500 //a little over 5 cm thick , 62500 for 1 m by 2.5 m by 0.25 m iron wall. also indicates the temperature at wich the wall will melt (currently only able to melt with H/E pipes)
@@ -266,7 +266,7 @@
 	return null

 /turf/closed/wall/acid_act(acidpwr, acid_volume)
-	if(explosion_block >= 2)
+	if(get_explosive_block() >= 2)
 		acidpwr = min(acidpwr, 50) //we reduce the power so strong walls never get melted.
 	return ..()

@@ -5,7 +5,7 @@
 	dir = SOUTH
 	baseturfs = /turf/open/space/transit
 	flags_1 = NOJAUNT //This line goes out to every wizard that ever managed to escape the den. I'm sorry.
-	explosion_block = INFINITY
+	explosive_resistance = INFINITY

 /turf/open/space/transit/get_smooth_underlay_icon(mutable_appearance/underlay_appearance, turf/asking_turf, adjacency_dir)
 	. = ..()
@@ -92,6 +92,12 @@ GLOBAL_LIST_EMPTY(station_turfs)
 	/// Sorry for the mess
 	var/area/in_contents_of
 #endif
+	/// How much explosive resistance this turf is providing to itself
+	/// Defaults to -1, interpreted as initial(explosive_resistance)
+	/// This is an optimization to prevent turfs from needing to set these on init
+	/// This would either be expensive, or impossible to manage. Let's just avoid it yes?
+	/// Never directly access this, use get_explosive_block() instead
+	var/inherent_explosive_resistance = -1

 /turf/vv_edit_var(var_name, new_value)
 	var/static/list/banned_edits = list(NAMEOF_STATIC(src, x), NAMEOF_STATIC(src, y), NAMEOF_STATIC(src, z))
@@ -681,6 +687,26 @@ GLOBAL_LIST_EMPTY(station_turfs)
 			continue
 		movable_content.wash(clean_types)

+/turf/set_density(new_value)
+	var/old_density = density
+	. = ..()
+	if(old_density == density)
+		return
+
+	if(old_density)
+		explosive_resistance -= get_explosive_block()
+	if(density)
+		explosive_resistance += get_explosive_block()
+
+/// Wrapper around inherent_explosive_resistance
+/// We assume this proc is cold, so we can move the "what is our block" into it
+/turf/proc/get_explosive_block()
+	if(inherent_explosive_resistance != -1)
+		return inherent_explosive_resistance
+	if(explosive_resistance)
+		return initial(explosive_resistance)
+	return 0
+
 /**
 * Returns adjacent turfs to this turf that are reachable, in all cardinal directions
 *
@@ -710,3 +736,9 @@ GLOBAL_LIST_EMPTY(station_turfs)

 /turf/proc/TakeTemperature(temp)
 	temperature += temp
+
+// I'm sorry, this is the only way that both makes sense and is cheap
+/turf/set_explosion_block(explosion_block)
+	explosive_resistance -= get_explosive_block()
+	inherent_explosive_resistance = explosion_block
+	explosive_resistance += get_explosive_block()
@@ -32,6 +32,7 @@
 		overmind.blobstrain.on_gain()
 		update_appearance()
 	AddComponent(/datum/component/stationloving, FALSE, TRUE)
+	AddElement(/datum/element/blocks_explosives)
 	return ..()

 /obj/structure/blob/special/core/Destroy()
@@ -16,6 +16,10 @@
 	fire = 90
 	acid = 90

+/obj/structure/blob/shield/Initialize(mapload, owner_overmind)
+	AddElement(/datum/element/blocks_explosives)
+	return ..()
+
 /obj/structure/blob/shield/scannerreport()
 	if(atmosblock)
 		return "Will prevent the spread of atmospheric changes."
@@ -476,6 +476,7 @@
 	name = "flesh mass"
 	icon_state = "lingspacesuit_t"
 	icon = 'icons/obj/clothing/suits/costume.dmi'
+	worn_icon = 'icons/mob/clothing/suits/costume.dmi'
 	desc = "A huge, bulky mass of pressure and temperature-resistant organic tissue, evolved to facilitate space travel."
 	item_flags = DROPDEL
 	clothing_flags = STOPSPRESSUREDAMAGE //Not THICKMATERIAL because it's organic tissue, so if somebody tries to inject something into it, it still ends up in your blood. (also balance but muh fluff)
@@ -5,7 +5,7 @@
 	icon_state = "cordon"
 	invisibility = INVISIBILITY_ABSTRACT
 	mouse_opacity = MOUSE_OPACITY_TRANSPARENT
-	explosion_block = INFINITY
+	explosive_resistance = INFINITY
 	rad_insulation = RAD_FULL_INSULATION
 	opacity = TRUE
 	density = TRUE
@@ -165,7 +165,6 @@
 	resistance_flags = NONE
 	species_exception = list(/datum/species/golem)

-// Lemom todo: and here
 /obj/item/clothing/suit/hazardvest/worn_overlays(mutable_appearance/standing, isinhands, icon_file)
 	. = ..()
 	if(!isinhands)
@@ -33,12 +33,13 @@
 	throw_range = 3
 	attack_verb_continuous = list("pompfs")
 	attack_verb_simple = list("pompf")
+	greyscale_colors = "#000000" //only here for unit testing. overriden in initialize()
 	greyscale_config = /datum/greyscale_config/flower_simple
 	greyscale_config_worn = /datum/greyscale_config/flower_simple_worn

 /obj/item/food/grown/rainbow_flower/Initialize(mapload)
 	. = ..()
-	if(greyscale_colors)
+	if(greyscale_colors != initial(greyscale_colors))
 		return

 	var/flower_color = rand(1,8)
@@ -26,6 +26,7 @@
 	var/slicing_duration = 100

 /obj/structure/tramwall/Initialize(mapload)
+	AddElement(/datum/element/blocks_explosives)
 	. = ..()
 	var/obj/item/stack/initialized_mineral = new mineral
 	set_custom_materials(initialized_mineral.mats_per_unit, mineral_amount)
@@ -56,6 +56,7 @@
 	name = "\improper Nanotrasen space pods"
 	desc = "Flex your money, AND ignore what everyone else says, all at once!"
 	icon_state = "spacepods"
+	worn_icon = 'icons/mob/clothing/ears.dmi'
 	inhand_icon_state = null
 	slot_flags = ITEM_SLOT_EARS
 	strip_delay = 100 //air pods don't fall out
@@ -251,7 +251,7 @@ GLOBAL_VAR_INIT(hhMysteryRoomNumber, rand(1, 999999))
 	icon_state = "hotelwall"
 	smoothing_groups = SMOOTH_GROUP_CLOSED_TURFS + SMOOTH_GROUP_HOTEL_WALLS
 	canSmoothWith = SMOOTH_GROUP_HOTEL_WALLS
-	explosion_block = INFINITY
+	explosive_resistance = INFINITY

 /turf/open/indestructible/hotelwood
 	desc = "Stylish dark wood with extra reinforcement. Secured firmly to the floor to prevent tampering."
@@ -271,7 +271,7 @@ GLOBAL_VAR_INIT(hhMysteryRoomNumber, rand(1, 999999))
 	base_icon_state = "bluespace"
 	baseturfs = /turf/open/space/bluespace
 	flags_1 = NOJAUNT
-	explosion_block = INFINITY
+	explosive_resistance = INFINITY
 	var/obj/item/hilbertshotel/parentSphere

 /turf/open/space/bluespace/Initialize(mapload)
@@ -290,7 +290,7 @@ GLOBAL_VAR_INIT(hhMysteryRoomNumber, rand(1, 999999))
 /turf/closed/indestructible/hoteldoor
 	name = "Hotel Door"
 	icon_state = "hoteldoor"
-	explosion_block = INFINITY
+	explosive_resistance = INFINITY
 	var/obj/item/hilbertshotel/parentSphere

 /turf/closed/indestructible/hoteldoor/proc/promptExit(mob/living/user)
@@ -280,9 +280,15 @@
 * If the item can be dropped, it will be forceMove()'d to the ground and the turf's Entered() will be called.
 */
 /mob/proc/dropItemToGround(obj/item/I, force = FALSE, silent = FALSE, invdrop = TRUE)
+	if (isnull(I))
+		return TRUE
+
+	SEND_SIGNAL(src, COMSIG_MOB_DROPPING_ITEM)
 	. = doUnEquip(I, force, drop_location(), FALSE, invdrop = invdrop, silent = silent)
+
 	if(!. || !I) //ensure the item exists and that it was dropped properly.
 		return
+
 	if(!(I.item_flags & NO_PIXEL_RANDOM_DROP))
 		I.pixel_x = I.base_pixel_x + rand(-6, 6)
 		I.pixel_y = I.base_pixel_y + rand(-6, 6)
@@ -86,7 +86,7 @@
 /// Kills the rat and changes its icon state to be splatted (bloody).
 /mob/living/basic/mouse/proc/splat()
 	icon_dead = "mouse_[body_color]_splat"
-	adjust_health(-maxHealth)
+	adjust_health(maxHealth)

 // On revival, re-add the mouse to the ratcap, or block it if we're at it
 /mob/living/basic/mouse/revive(full_heal_flags = NONE, excess_healing = 0, force_grab_ghost = FALSE)
@@ -30,7 +30,7 @@
 	QDEL_NULL(dna)
 	GLOB.carbon_list -= src

-/mob/living/carbon/swap_hand(held_index)
+/mob/living/carbon/perform_hand_swap(held_index)
 	. = ..()
 	if(!.)
 		return
@@ -155,7 +155,7 @@ There are several things that need to be remembered:
 		var/icon_file

 		if(!icon_exists(icon_file, RESOLVE_ICON_STATE(worn_item)))
-			icon_file = 'icons/mob/simple/mob.dmi'
+			icon_file = 'icons/mob/clothing/id.dmi'

 		id_overlay = wear_id.build_worn_icon(default_layer = ID_LAYER, default_icon_file = icon_file)

@@ -397,7 +397,7 @@
 		if(slot_num > 4) // not >3 otherwise cycling with just one item on module 3 wouldn't work
 			slot_num = 1 //Wrap around.

-/mob/living/silicon/robot/swap_hand()
+/mob/living/silicon/robot/perform_hand_swap()
 	cycle_modules()

 /mob/living/silicon/robot/can_hold_items(obj/item/I)
@@ -616,7 +616,7 @@
 	else
 		mode()

-/mob/living/simple_animal/swap_hand(hand_index)
+/mob/living/simple_animal/perform_hand_swap(hand_index)
 	. = ..()
 	if(!.)
 		return
@@ -885,11 +885,23 @@

 	return data

-/mob/proc/swap_hand()
+/mob/proc/swap_hand(held_index)
+	SHOULD_NOT_OVERRIDE(TRUE) // Override perform_hand_swap instead
+
 	var/obj/item/held_item = get_active_held_item()
-	if(SEND_SIGNAL(src, COMSIG_MOB_SWAP_HANDS, held_item) & COMPONENT_BLOCK_SWAP)
+	if(SEND_SIGNAL(src, COMSIG_MOB_SWAPPING_HANDS, held_item) & COMPONENT_BLOCK_SWAP)
 		to_chat(src, span_warning("Your other hand is too busy holding [held_item]."))
 		return FALSE
+
+	var/result = perform_hand_swap(held_index)
+	if (result)
+		SEND_SIGNAL(src, COMSIG_MOB_SWAP_HANDS)
+
+	return result
+
+/// Performs the actual ritual of swapping hands, such as setting the held index variables
+/mob/proc/perform_hand_swap(held_index)
+	PROTECTED_PROC(TRUE)
 	return TRUE

 /mob/proc/activate_hand(selhand)
@@ -31,13 +31,13 @@
 	var/corpse_theme = pick_weight(list(
 		"Miner" = 66,
 		"Ashwalker" = 10,
-		"Golem" = 10,
 		"Clown" = 10,
+		"Golem" = 10,
 		pick(list(
-			"Shadow",
+			"Cultist",
 			"Dame",
 			"Operative",
-			"Cultist",
+			"Shadow",
 		)) = 4,
 	))
 	switch(corpse_theme)
@@ -47,16 +47,16 @@
 			outfit = /datum/outfit/consumed_ashwalker
 		if("Clown")
 			outfit = /datum/outfit/consumed_clown
-		if("Golem")
-			outfit = /datum/outfit/consumed_golem
+		if("Cultist")
+			outfit = /datum/outfit/consumed_cultist
 		if("Dame")
 			outfit = /datum/outfit/consumed_dame
+		if("Golem")
+			outfit = /datum/outfit/consumed_golem
 		if("Operative")
 			outfit = /datum/outfit/syndicatecommandocorpse
 		if("Shadow")
 			outfit = /datum/outfit/consumed_shadowperson
-		if("Cultist")
-			outfit = /datum/outfit/consumed_cultist
 	. = ..()

 /datum/outfit/consumed_miner
@@ -70,31 +70,56 @@
 	if(visualsOnly)
 		regular_uniform = TRUE //assume human
 	else
-		var/new_species_type = pick_weight(list(/datum/species/human = 70, /datum/species/lizard = 26, /datum/species/fly = 2, /datum/species/plasmaman = 2))
+		var/new_species_type = pick_weight(list(
+			/datum/species/human = 70,
+			/datum/species/lizard = 26,
+			/datum/species/fly = 2,
+			/datum/species/plasmaman = 2,
+		))
 		miner.set_species(new_species_type)
 		if(new_species_type != /datum/species/plasmaman)
 			regular_uniform = TRUE
 		else
 			uniform = /obj/item/clothing/under/plasmaman
-			head = /obj/item/clothing/head/helmet/space/plasmaman
 			belt = /obj/item/tank/internals/plasmaman/belt
+			head = /obj/item/clothing/head/helmet/space/plasmaman
 		if(new_species_type == /datum/species/lizard)
 			shoes = null //digitigrade says no
 	if(regular_uniform)
 		uniform = /obj/item/clothing/under/rank/cargo/miner/lavaland
 		if(prob(4))
-			belt = pick_weight(list(/obj/item/storage/belt/mining = 2, /obj/item/storage/belt/mining/alt = 2))
+			belt = pick_weight(list(
+				/obj/item/storage/belt/mining = 2,
+				/obj/item/storage/belt/mining/alt = 2,
+			))
 		else if(prob(10))
-			belt = pick_weight(list(/obj/item/pickaxe = 8, /obj/item/pickaxe/mini = 4, /obj/item/pickaxe/silver = 2, /obj/item/pickaxe/diamond = 1))
+			belt = pick_weight(list(
+				/obj/item/pickaxe = 8,
+				/obj/item/pickaxe/mini = 4,
+				/obj/item/pickaxe/silver = 2,
+				/obj/item/pickaxe/diamond = 1,
+			))
 		else
 			belt = /obj/item/tank/internals/emergency_oxygen/engi

 	if(prob(20))
-		suit = pick_weight(list(/obj/item/clothing/suit/hooded/explorer = 18, /obj/item/clothing/suit/hooded/cloak/goliath = 2))
+		suit = pick_weight(list(
+			/obj/item/clothing/suit/hooded/explorer = 18,
+			/obj/item/clothing/suit/hooded/cloak/goliath = 2,
+		))
 	if(prob(30))
-		r_pocket = pick_weight(list(/obj/item/stack/marker_beacon = 20, /obj/item/stack/spacecash/c1000 = 7, /obj/item/reagent_containers/hypospray/medipen/survival = 2, /obj/item/borg/upgrade/modkit/damage = 1 ))
+		r_pocket = pick_weight(list(
+			/obj/item/stack/marker_beacon = 20,
+			/obj/item/stack/spacecash/c1000 = 7,
+			/obj/item/reagent_containers/hypospray/medipen/survival = 2,
+			/obj/item/borg/upgrade/modkit/damage = 1,
+		))
 	if(prob(10))
-		l_pocket = pick_weight(list(/obj/item/stack/spacecash/c1000 = 7, /obj/item/reagent_containers/hypospray/medipen/survival = 2, /obj/item/borg/upgrade/modkit/cooldown = 1 ))
+		l_pocket = pick_weight(list(
+			/obj/item/stack/spacecash/c1000 = 7,
+			/obj/item/reagent_containers/hypospray/medipen/survival = 2,
+			/obj/item/borg/upgrade/modkit/cooldown = 1,
+		))

 /datum/outfit/consumed_ashwalker
 	name = "Legion-Consumed Ashwalker"
@@ -106,17 +131,20 @@
 	if(prob(95))
 		head = /obj/item/clothing/head/helmet/gladiator
 	else
-		head = /obj/item/clothing/head/helmet/skull
 		suit = /obj/item/clothing/suit/armor/bone
 		gloves = /obj/item/clothing/gloves/bracer
+		head = /obj/item/clothing/head/helmet/skull
 	if(prob(5))
-		back = pick_weight(list(/obj/item/spear/bonespear = 3, /obj/item/fireaxe/boneaxe = 2))
+		back = pick_weight(list(
+			/obj/item/spear/bonespear = 3,
+			/obj/item/fireaxe/boneaxe = 2,
+	))
 	if(prob(10))
 		belt = /obj/item/storage/belt/mining/primitive
-	if(prob(30))
-		r_pocket = /obj/item/knife/combat/bone
 	if(prob(30))
 		l_pocket = /obj/item/knife/combat/bone
+	if(prob(30))
+		r_pocket = /obj/item/knife/combat/bone

 //takes a lot from the clown job, notably NO PDA and different backpack loot + pocket goodies
 /datum/outfit/consumed_clown
@@ -140,7 +168,14 @@
 	if(!visualsOnly)
 		clown.fully_replace_character_name(clown.name, pick(GLOB.clown_names))
 	if(prob(70))
-		var/backpack_loot = pick(list(/obj/item/stamp/clown = 1, /obj/item/reagent_containers/spray/waterflower = 1, /obj/item/food/grown/banana = 1, /obj/item/megaphone/clown = 1, /obj/item/reagent_containers/cup/soda_cans/canned_laughter = 1, /obj/item/pneumatic_cannon/pie))
+		var/backpack_loot = pick(list(
+			/obj/item/food/grown/banana = 1,
+			/obj/item/megaphone/clown = 1,
+			/obj/item/pneumatic_cannon/pie,
+			/obj/item/reagent_containers/cup/soda_cans/canned_laughter = 1,
+			/obj/item/reagent_containers/spray/waterflower = 1,
+			/obj/item/stamp/clown = 1,
+		))
 		if(backpack_loot == /obj/item/pneumatic_cannon/pie)
 			drop_a_pie_cannon = TRUE
 		else
@@ -148,7 +183,10 @@
 	if(prob(30))
 		backpack_contents += list(/obj/item/stack/sheet/mineral/bananium = pick_weight(list( 1 = 3, 2 = 2, 3 = 1)))
 	if(prob(10))
-		l_pocket = pick_weight(list(/obj/item/bikehorn/golden = 3, /obj/item/bikehorn/airhorn = 1))
+		l_pocket = pick_weight(list(
+			/obj/item/bikehorn/golden = 3,
+			/obj/item/bikehorn/airhorn = 1,
+		))
 	if(prob(10))
 		r_pocket = /obj/item/implanter/sad_trombone

@@ -163,26 +201,46 @@

 /datum/outfit/consumed_golem/pre_equip(mob/living/carbon/human/golem, visualsOnly = FALSE)
 	if(!visualsOnly)
-		golem.set_species(pick(/datum/species/golem/adamantine, /datum/species/golem/plasma, /datum/species/golem/diamond, /datum/species/golem/gold, /datum/species/golem/silver, /datum/species/golem/plasteel, /datum/species/golem/titanium, /datum/species/golem/plastitanium))
+		golem.set_species(pick(
+			/datum/species/golem/adamantine,
+			/datum/species/golem/diamond,
+			/datum/species/golem/gold,
+			/datum/species/golem/plasma,
+			/datum/species/golem/plasteel,
+			/datum/species/golem/plastitanium,
+			/datum/species/golem/silver,
+			/datum/species/golem/titanium,
+		))
 	if(prob(30))
-		glasses = pick_weight(list(/obj/item/clothing/glasses/meson = 2, /obj/item/clothing/glasses/hud/health = 2, /obj/item/clothing/glasses/hud/diagnostic =2, /obj/item/clothing/glasses/science = 2, /obj/item/clothing/glasses/welding = 2, /obj/item/clothing/glasses/night = 1))
+		glasses = pick_weight(list(
+			/obj/item/clothing/glasses/hud/diagnostic = 2,
+			/obj/item/clothing/glasses/hud/health = 2,
+			/obj/item/clothing/glasses/meson = 2,
+			/obj/item/clothing/glasses/science = 2,
+			/obj/item/clothing/glasses/welding = 2,
+			/obj/item/clothing/glasses/night = 1,
+		))
 	if(prob(10) && !visualsOnly) //visualsonly = not a golem = can't put things in the belt slot without a jumpsuit
-		belt = pick(list(/obj/item/storage/belt/mining/vendor, /obj/item/storage/belt/utility/full))
+		belt = pick(list(
+			/obj/item/crowbar/power,
+			/obj/item/screwdriver/power,
+			/obj/item/storage/belt/mining/vendor,
+			/obj/item/storage/belt/utility/full,
+			/obj/item/weldingtool/experimental,
+		))
 	if(prob(50))
 		neck = /obj/item/bedsheet/rd/royal_cape
-	if(prob(10) && !visualsOnly) //visualsonly = not a golem = can't put things in the pockets without a jumpsuit
-		l_pocket = pick(list(/obj/item/crowbar/power, /obj/item/screwdriver/power, /obj/item/weldingtool/electric)) // SKYRAT EDIT CHANGE FROM /obj/item/weldingtool/experimental

 //this is so pointlessly gendered but whatever bro i'm here to refactor not judge
 /datum/outfit/consumed_dame
 	name = "Legion-Consumed Dame"
 	uniform = /obj/item/clothing/under/costume/maid
-	gloves = /obj/item/clothing/gloves/color/white
-	shoes = /obj/item/clothing/shoes/laceup
-	head = /obj/item/clothing/head/helmet/knight
 	suit = /obj/item/clothing/suit/armor/riot/knight
-	r_pocket = /obj/item/tank/internals/emergency_oxygen
+	gloves = /obj/item/clothing/gloves/color/white
+	head = /obj/item/clothing/head/helmet/knight
 	mask = /obj/item/clothing/mask/breath
+	shoes = /obj/item/clothing/shoes/laceup
+	r_pocket = /obj/item/tank/internals/emergency_oxygen

 /datum/outfit/consumed_dame/pre_equip(mob/living/carbon/human/dame, visualsOnly = FALSE)
 	if(!visualsOnly)
@@ -197,14 +255,15 @@

 /datum/outfit/consumed_shadowperson
 	name = "Legion-Consumed Shadowperson"
-	r_pocket = /obj/item/reagent_containers/pill/shadowtoxin
-	accessory = /obj/item/clothing/accessory/medal/plasma/nobel_science
 	uniform = /obj/item/clothing/under/color/black
-	shoes = /obj/item/clothing/shoes/sneakers/black
 	suit = /obj/item/clothing/suit/toggle/labcoat
-	glasses = /obj/item/clothing/glasses/blindfold
 	back = /obj/item/tank/internals/oxygen
+	glasses = /obj/item/clothing/glasses/blindfold
 	mask = /obj/item/clothing/mask/breath
+	shoes = /obj/item/clothing/shoes/sneakers/black
+	r_pocket = /obj/item/reagent_containers/pill/shadowtoxin
+
+	accessory = /obj/item/clothing/accessory/medal/plasma/nobel_science

 /datum/outfit/consumed_shadowperson/pre_equip(mob/living/carbon/human/shadowperson, visualsOnly = FALSE)
 	if(visualsOnly)
@@ -217,5 +276,10 @@
 	suit = /obj/item/clothing/suit/hooded/cultrobes
 	suit_store = /obj/item/tome
 	back = /obj/item/storage/backpack/cultpack
+	backpack_contents = list(
+		/obj/item/cult_shift = 1,
+		/obj/item/flashlight/flare/culttorch = 1,
+		/obj/item/reagent_containers/cup/beaker/unholywater = 1,
+		/obj/item/stack/sheet/runed_metal = 15,
+		)
 	r_pocket = /obj/item/clothing/glasses/hud/health/night/cultblind
-	backpack_contents = list(/obj/item/reagent_containers/cup/beaker/unholywater = 1, /obj/item/cult_shift = 1, /obj/item/flashlight/flare/culttorch = 1, /obj/item/stack/sheet/runed_metal = 15)
@@ -322,13 +322,7 @@
 	var/decrement = 1
 	var/atom/location = loc
 	if (reactionary)
-		if(location.density || !isturf(location))
-			decrement += location.explosion_block
-		for(var/obj/thing in location)
-			if (thing == src)
-				continue
-			var/the_block = thing.explosion_block
-			decrement += the_block == EXPLOSION_BLOCK_PROC ? thing.GetExplosionBlock() : the_block
+		decrement += location.explosive_resistance

 	range = max(range - decrement + 1, 0) // Already decremented by 1 in the parent. Exists so that if we pass through something with negative block it extends the range.
 	heavy_ex_range = max(heavy_ex_range - decrement, 0)
@@ -260,7 +260,7 @@
 	desc = "Used to set the destination of properly wrapped packages."
 	icon = 'icons/obj/device.dmi'
 	icon_state = "cargo tagger"
-	worn_icon_state = "cargo tagger"
+	worn_icon_state = "cargotagger"
 	var/currTag = 0 //Destinations are stored in code\globalvars\lists\flavor_misc.dm
 	var/locked_destination = FALSE //if true, users can't open the destination tag window to prevent changing the tagger's current destination
 	w_class = WEIGHT_CLASS_TINY
@@ -18,6 +18,12 @@ If you create T5+ please take a pass at mech_fabricator.dm. The parts being good
 	. = ..()
 	create_storage(type = /datum/storage/rped)

+// check to see if this rped have atleast one circuitboard
+/obj/item/storage/part_replacer/proc/has_an_circuitboard()
+	for(var/obj/item/circuitboard/machine/board in contents)
+		return TRUE
+	return FALSE
+
 /obj/item/storage/part_replacer/pre_attack(obj/attacked_object, mob/living/user, params)
 	if(!ismachinery(attacked_object) && !istype(attacked_object, /obj/structure/frame/machine))
 		return ..()
@@ -37,13 +43,12 @@ If you create T5+ please take a pass at mech_fabricator.dm. The parts being good
 		return TRUE

 	var/obj/structure/frame/machine/attacked_frame = attacked_object
-
-	if(!attacked_frame.components)
-		return ..()
-
+	// no point attacking the frame with the rped if the frame doesn't have wiring or it doesn't have components & rped has no circuitboard to offer as an component.
+	if(attacked_frame.state == 1 || (!attacked_frame.components && !has_an_circuitboard()))
+		return TRUE
+	attacked_frame.attackby(src, user)
 	if(works_from_distance)
 		user.Beam(attacked_frame, icon_state = "rped_upgrade", time = 5)
-	attacked_frame.attackby(src, user)
 	return TRUE

 /obj/item/storage/part_replacer/afterattack(obj/attacked_object, mob/living/user, adjacent, params)
@@ -65,13 +70,12 @@ If you create T5+ please take a pass at mech_fabricator.dm. The parts being good
 		return

 	var/obj/structure/frame/machine/attacked_frame = attacked_object
-
-	if(!attacked_frame.components)
-		return ..()
-
+	// no point attacking the frame with the rped if the frame doesn't have wiring or it doesn't have components & rped has no circuitboard to offer as an component.
+	if(attacked_frame.state == 1 || (!attacked_frame.components && !has_an_circuitboard()))
+		return
+	attacked_frame.attackby(src, user)
 	if(works_from_distance)
 		user.Beam(attacked_frame, icon_state = "rped_upgrade", time = 5)
-	attacked_frame.attackby(src, user)

 /obj/item/storage/part_replacer/proc/play_rped_sound()
 	//Plays the sound for RPED exhanging or installing parts.
@@ -220,6 +224,9 @@ If you create T5+ please take a pass at mech_fabricator.dm. The parts being good
 	var/list/part_list = list()
 	//Assemble a list of current parts, then sort them by their rating!
 	for(var/obj/item/component_part in contents)
+		//No need to put circuit boards in this list
+		if(istype(component_part, /obj/item/circuitboard))
+			continue
 		part_list += component_part
 		//Sort the parts. This ensures that higher tier items are applied first.
 	part_list = sortTim(part_list, GLOBAL_PROC_REF(cmp_rped_sort))
@@ -0,0 +1,257 @@
+/// The base for a contextual tutorial.
+/// In order to give a tutorial to someone, use `SStutorials.suggest_tutorial(user, /datum/tutorial/subtype)`
+/datum/tutorial
+	/// If set, any account who started playing before this date will not be given this tutorial.
+	/// Date is in YYYY-MM-DD format.
+	var/grandfather_date
+
+	/// The mob we are giving the tutorial to
+	VAR_PROTECTED/mob/user
+
+	VAR_PRIVATE/atom/movable/screen/tutorial_instruction/instruction_screen
+
+/datum/tutorial/New(mob/user)
+	src.user = user
+
+	RegisterSignal(user, COMSIG_PARENT_QDELETING, PROC_REF(destroy_self))
+	RegisterSignal(user.client, COMSIG_PARENT_QDELETING, PROC_REF(destroy_self))
+
+/datum/tutorial/Destroy(force, ...)
+	user.client?.screen -= instruction_screen
+	QDEL_NULL(instruction_screen)
+
+	user = null
+
+	return ..()
+
+/// Gets the [`/datum/tutorial_manager`] that owns this tutorial.
+/datum/tutorial/proc/manager()
+	RETURN_TYPE(/datum/tutorial_manager)
+	return SStutorials.tutorial_managers[type]
+
+/// The actual steps of the tutorial. Is given any excess arguments of suggest_tutorial.
+/// Must be overridden.
+/datum/tutorial/proc/perform()
+	SHOULD_CALL_PARENT(FALSE)
+	CRASH("[type] does not override perform()")
+
+/// Returns TRUE/FALSE if this tutorial should be given.
+/// If FALSE, does not mean it won't come back later.
+/datum/tutorial/proc/should_perform()
+	SHOULD_CALL_PARENT(FALSE)
+	return TRUE
+
+/// Called by the tutorial when the user has successfully completed it.
+/// Will mark it as completed in the datbaase and kick off destruction of the tutorial.
+/datum/tutorial/proc/complete()
+	SIGNAL_HANDLER
+	PROTECTED_PROC(TRUE)
+	SHOULD_NOT_OVERRIDE(TRUE)
+
+	manager().complete(user)
+	perform_base_completion_effects()
+
+/// As opposed to `complete()`, this merely hides the tutorial.
+/// This should be used when the user doesn't need the tutorial anymore, but didn't
+/// actually properly finish it.
+/datum/tutorial/proc/dismiss()
+	SIGNAL_HANDLER
+	PROTECTED_PROC(TRUE)
+	SHOULD_NOT_OVERRIDE(TRUE)
+
+	manager().dismiss(user)
+	perform_base_completion_effects()
+
+#define INSTRUCTION_SCREEN_DELAY (1 SECONDS)
+
+/datum/tutorial/proc/perform_base_completion_effects()
+	SHOULD_NOT_OVERRIDE(TRUE)
+
+	var/delay = perform_completion_effects_with_delay()
+
+	if (!isnull(instruction_screen))
+		animate(instruction_screen, time = INSTRUCTION_SCREEN_DELAY, alpha = 0, easing = SINE_EASING)
+		delay += INSTRUCTION_SCREEN_DELAY
+
+	QDEL_IN(src, delay)
+
+/// Called when the tutorial is being hidden, but before it is deleted.
+/// You should unregister signals and fade out any of your creations in here.
+/// Returns how long extra to delay the deletion.
+/datum/tutorial/proc/perform_completion_effects_with_delay()
+	SHOULD_CALL_PARENT(FALSE)
+	PROTECTED_PROC(TRUE)
+
+	return 0
+
+#undef INSTRUCTION_SCREEN_DELAY
+
+/datum/tutorial/proc/destroy_self()
+	SIGNAL_HANDLER
+	PRIVATE_PROC(TRUE)
+	SHOULD_NOT_OVERRIDE(TRUE)
+
+	manager().dismiss(user)
+	qdel(src)
+
+/// Shows a large piece of text on the user's screen with the given message.
+/// If a message already exists, will fade it out and replace it.
+/datum/tutorial/proc/show_instruction(message)
+	PROTECTED_PROC(TRUE)
+
+	if (isnull(instruction_screen))
+		instruction_screen = new(null, message, user.client)
+		user.client?.screen += instruction_screen
+	else
+		instruction_screen.change_message(message)
+
+/// Given a keybind and a message, will replace %KEY% in `message` with the first keybind they have.
+/// As a fallback, will return the third parameter, `message_without_keybinds`, if none are set.
+/datum/tutorial/proc/keybinding_message(datum/keybinding/keybinding_type, message, message_without_keybinds)
+	PROTECTED_PROC(TRUE)
+
+	var/list/keybinds = user.client?.prefs.key_bindings[initial(keybinding_type.name)]
+	return keybinds?.len > 0 ? replacetext(message, "%KEY%", "<b>[keybinds[1]]</b>") : message_without_keybinds
+
+/// Creates a UI element with the given `icon_state`, starts it at `initial_screen_loc`, and animates it to `target_screen_loc`.
+/// Waits `animate_start_time` before moving.
+/datum/tutorial/proc/animate_ui_element(icon_state, initial_screen_loc, target_screen_loc, animate_start_time)
+	PROTECTED_PROC(TRUE)
+
+	var/atom/movable/screen/preview = new
+	preview.icon = ui_style2icon(user.client?.prefs.read_preference(/datum/preference/choiced/ui_style) || GLOB.available_ui_styles[1])
+	preview.icon_state = icon_state
+	preview.mouse_opacity = MOUSE_OPACITY_TRANSPARENT
+	preview.screen_loc = "1,1"
+
+	var/view = user.client?.view
+
+	var/list/origin_offsets = screen_loc_to_offset(initial_screen_loc, view)
+
+	// A little offset to the right
+	var/matrix/origin_transform = TRANSLATE_MATRIX(origin_offsets[1] - world.icon_size * 0.5, origin_offsets[2] - world.icon_size * 1.5)
+
+	var/list/target_offsets = screen_loc_to_offset(target_screen_loc, view)
+	// `- world.icon_Size * 0.5` to patch over a likely bug in screen_loc_to_offset with CENTER, needs more looking at
+	var/matrix/animate_to_transform = TRANSLATE_MATRIX(target_offsets[1] - world.icon_size * 1.5, target_offsets[2] - world.icon_size)
+
+	preview.transform = origin_transform
+
+	preview.alpha = 0
+	animate(preview, time = animate_start_time, alpha = 255, easing = CUBIC_EASING)
+	animate(1.4 SECONDS)
+	animate(transform = animate_to_transform, time = 2 SECONDS, easing = SINE_EASING | EASE_IN)
+	animate(alpha = 0, time = 2.4 SECONDS, easing = CUBIC_EASING | EASE_IN, flags = ANIMATION_PARALLEL)
+
+	user.client?.screen += preview
+
+	return preview
+
+/// A singleton that manages when to create tutorials of a specific tutorial type.
+/datum/tutorial_manager
+	VAR_PRIVATE/datum/tutorial/tutorial_type
+
+	/// ckeys that we know have finished the tutorial
+	VAR_PRIVATE/list/finished_ckeys = list()
+
+	/// ckeys that have performed the tutorial, but have not completed it.
+	/// Doesn't mean that they can still see the tutorial, might have meant the tutorial was dismissed
+	/// without being completed, such as during a log out.
+	VAR_PRIVATE/list/performing_ckeys = list()
+
+/datum/tutorial_manager/New(tutorial_type)
+	ASSERT(ispath(tutorial_type, /datum/tutorial))
+	src.tutorial_type = tutorial_type
+
+/datum/tutorial_manager/Destroy(force, ...)
+	if (!force)
+		stack_trace("Something is trying to destroy [type], which is a singleton")
+		return QDEL_HINT_LETMELIVE
+	return ..()
+
+/// Checks if we should perform the tutorial for the given user, and performs if so.
+/// Use `SStutorials.suggest_tutorial` instead of calling this directly.
+/datum/tutorial_manager/proc/try_perform(mob/user, list/arguments)
+	var/datum/tutorial/tutorial = new tutorial_type(user)
+	if (!tutorial.should_perform(user))
+		qdel(tutorial)
+		return
+
+	performing_ckeys[user.ckey] = TRUE
+
+	tutorial.perform(arglist(arguments))
+
+/// Checks if the user should be given this tutorial
+/datum/tutorial_manager/proc/should_run(mob/user)
+	var/ckey = user.ckey
+
+	if (isnull(ckey))
+		return FALSE
+
+	if (ckey in finished_ckeys)
+		return FALSE
+
+	if (ckey in performing_ckeys)
+		return FALSE
+
+	if (!SSdbcore.IsConnected())
+		return CONFIG_GET(flag/give_tutorials_without_db)
+
+	var/player_join_date = user.client?.player_join_date
+	if (isnull(player_join_date))
+		return FALSE
+
+	// This works because ISO-8601 is cool
+	var/grandfather_date = initial(tutorial_type.grandfather_date)
+	if (!isnull(grandfather_date) && player_join_date < grandfather_date)
+		return FALSE
+
+	return TRUE
+
+/// Marks the tutorial as completed.
+/// Call `/datum/tutorial/proc/complete()` instead.
+/datum/tutorial_manager/proc/complete(mob/user)
+	set waitfor = FALSE
+
+	ASSERT(!isnull(user.ckey))
+
+	finished_ckeys[user.ckey] = TRUE
+	performing_ckeys -= user.ckey
+
+	SSblackbox.record_feedback("tally", "tutorial_completed", 1, "[tutorial_type]")
+	log_game("[key_name(user)] completed the [tutorial_type] tutorial.")
+
+	if (SSdbcore.IsConnected())
+		INVOKE_ASYNC(src, PROC_REF(log_completion_to_database), user.ckey)
+
+/datum/tutorial_manager/proc/log_completion_to_database(ckey)
+	PRIVATE_PROC(TRUE)
+
+	var/datum/db_query/insert_tutorial_query = SSdbcore.NewQuery(
+		"INSERT INTO [format_table_name("tutorial_completions")] (ckey, tutorial_key) VALUES (:ckey, :tutorial_key) ON DUPLICATE KEY UPDATE tutorial_key = tutorial_key",
+		list(
+			"ckey" = ckey,
+			"tutorial_key" = get_key(),
+		)
+	)
+
+	insert_tutorial_query.warn_execute()
+
+	qdel(insert_tutorial_query)
+
+/// Dismisses the tutorial, not marking it as completed in the database.
+/// Call `/datum/tutorial/proc/dismiss()` instead.
+/datum/tutorial_manager/proc/dismiss(mob/user)
+	performing_ckeys -= user.ckey
+
+/// Given a ckey, will mark them as being completed without affecting the database.
+/// Call `/datum/tutorial/proc/complete()` instead.
+/datum/tutorial_manager/proc/mark_as_completed(ckey)
+	finished_ckeys[ckey] = TRUE
+	performing_ckeys -= ckey
+
+/// Gives the key that will be saved in the database.
+/// Must be 64 characters or less.
+/datum/tutorial_manager/proc/get_key()
+	SHOULD_BE_PURE(TRUE)
+	return copytext("[tutorial_type]", length("[/datum/tutorial]") + 2)
@@ -0,0 +1,53 @@
+/atom/movable/screen/tutorial_instruction
+	icon = 'icons/effects/alphacolors.dmi'
+	icon_state = "white"
+	color = COLOR_NEARLY_ALL_BLACK
+	alpha = 0
+	screen_loc = "TOP-2,CENTER"
+	layer = TUTORIAL_INSTRUCTIONS_LAYER
+	mouse_opacity = MOUSE_OPACITY_TRANSPARENT
+
+	var/client/client
+	var/atom/movable/screen/tutorial_instruction_text/instruction_text
+
+/atom/movable/screen/tutorial_instruction/Initialize(mapload, message, client/client)
+	. = ..()
+
+	transform = transform.Scale(36, 2.5)
+
+	src.client = client
+	animate(src, alpha = 245, time = 0.8 SECONDS, easing = SINE_EASING)
+
+	instruction_text = new(src, message, client)
+	vis_contents += instruction_text
+
+/atom/movable/screen/tutorial_instruction/Destroy()
+	client = null
+	QDEL_NULL(instruction_text)
+
+	return ..()
+
+/atom/movable/screen/tutorial_instruction/proc/change_message(message)
+	instruction_text.change_message(message)
+
+/atom/movable/screen/tutorial_instruction_text
+	maptext_height = 480
+	maptext_y = -2
+	mouse_opacity = MOUSE_OPACITY_TRANSPARENT
+	layer = TUTORIAL_INSTRUCTIONS_LAYER
+
+/atom/movable/screen/tutorial_instruction_text/Initialize(mapload, message, client/client)
+	. = ..()
+
+	var/view = client?.view_size.getView()
+	maptext_width = view ? view_to_pixels(view)[1] : 480
+	pixel_x = (maptext_width - world.icon_size) * -0.5
+
+	change_message(message)
+
+/atom/movable/screen/tutorial_instruction_text/proc/change_message(message)
+	// We don't use MAPTEXT macro here because it doesn't handle big text
+	message = "<span style='font-family: \"VCR OSD Mono\"; font-size: 22px; text-align: center'>[message]</span>"
+
+	animate(src, alpha = 0, time = (maptext ? 0.5 SECONDS : 0), easing = SINE_EASING)
+	animate(alpha = 255, time = 0.5 SECONDS, maptext = message)
@@ -0,0 +1,109 @@
+#define TIME_TO_START_MOVING_DROP_ICON (0.5 SECONDS)
+
+#define STAGE_DROP_ITEM "STAGE_DROP_ITEM"
+#define STAGE_PICK_SOMETHING_UP "STAGE_PICK_SOMETHING_UP"
+
+/// Tutorial for showing how to drop items.
+/// Fired when clicking on an item with another item with a filled inactive hand.
+/datum/tutorial/drop
+	grandfather_date = "2023-01-07"
+
+	var/stage = STAGE_DROP_ITEM
+	var/atom/movable/screen/drop_preview
+	var/obj/last_held_item
+
+/datum/tutorial/drop/Destroy(force, ...)
+	last_held_item = null
+	user.client?.screen -= drop_preview
+	QDEL_NULL(drop_preview)
+	return ..()
+
+/datum/tutorial/drop/perform(list/params)
+	create_drop_preview(params[SCREEN_LOC])
+	addtimer(CALLBACK(src, PROC_REF(show_instructions)), TIME_TO_START_MOVING_DROP_ICON)
+
+	RegisterSignal(user, COMSIG_MOB_DROPPING_ITEM, PROC_REF(on_dropped_item))
+	RegisterSignal(user, COMSIG_MOB_SWAP_HANDS, PROC_REF(on_swap_hands))
+	RegisterSignal(user, COMSIG_LIVING_PICKED_UP_ITEM, PROC_REF(on_pick_up_item))
+
+	update_held_item()
+
+/datum/tutorial/drop/perform_completion_effects_with_delay()
+	UnregisterSignal(user, list(COMSIG_MOB_DROPPING_ITEM, COMSIG_MOB_SWAP_HANDS, COMSIG_LIVING_PICKED_UP_ITEM))
+	if (!isnull(last_held_item))
+		UnregisterSignal(last_held_item, COMSIG_MOVABLE_MOVED)
+
+	return 0
+
+/datum/tutorial/drop/proc/create_drop_preview(initial_screen_loc)
+	drop_preview = animate_ui_element(
+		"act_drop",
+		initial_screen_loc,
+		ui_drop_throw,
+		TIME_TO_START_MOVING_DROP_ICON,
+	)
+
+/datum/tutorial/drop/proc/show_instructions()
+	if (QDELETED(src))
+		return
+
+	switch (stage)
+		if (STAGE_DROP_ITEM)
+			show_instruction(keybinding_message(
+				/datum/keybinding/mob/drop_item,
+				"Press '%KEY%' to drop your current item",
+				"Click '<b>DROP</b>' to drop your current item",
+			))
+		if (STAGE_PICK_SOMETHING_UP)
+			show_instruction("Pick something up!")
+
+/datum/tutorial/drop/proc/on_swap_hands()
+	SIGNAL_HANDLER
+
+	if (isnull(user.get_active_held_item()))
+		if (stage != STAGE_PICK_SOMETHING_UP)
+			stage = STAGE_PICK_SOMETHING_UP
+			show_instructions()
+	else if (stage == STAGE_PICK_SOMETHING_UP)
+		stage = STAGE_DROP_ITEM
+		show_instructions()
+
+	update_held_item()
+
+/datum/tutorial/drop/proc/on_dropped_item()
+	SIGNAL_HANDLER
+
+	stage = STAGE_PICK_SOMETHING_UP
+	show_instructions()
+
+/datum/tutorial/drop/proc/on_pick_up_item()
+	SIGNAL_HANDLER
+
+	if (stage != STAGE_PICK_SOMETHING_UP)
+		dismiss()
+		return
+
+	complete()
+
+// Exists so that if we, say, place the item on a table, we don't count that as completion
+/datum/tutorial/drop/proc/update_held_item()
+	if (!isnull(last_held_item))
+		UnregisterSignal(last_held_item, COMSIG_MOVABLE_MOVED)
+
+	last_held_item = user.get_active_held_item()
+	if (isnull(last_held_item))
+		return
+
+	RegisterSignal(last_held_item, COMSIG_MOVABLE_MOVED, PROC_REF(on_held_item_moved))
+
+/datum/tutorial/drop/proc/on_held_item_moved()
+	SIGNAL_HANDLER
+
+	if (stage == STAGE_PICK_SOMETHING_UP)
+		return
+
+	dismiss()
+
+#undef STAGE_DROP_ITEM
+#undef STAGE_PICK_SOMETHING_UP
+#undef TIME_TO_START_MOVING_DROP_ICON
@@ -0,0 +1,86 @@
+#define TIME_TO_START_MOVING_HAND_ICON (0.5 SECONDS)
+
+#define STAGE_SHOULD_SWAP_HAND "STAGE_SHOULD_SWAP_HAND"
+#define STAGE_PICK_UP_ITEM "STAGE_PICK_UP_ITEM"
+
+/// Tutorial for showing how to switch hands.
+/// Fired when clicking on an item with another item with an empty inactive hand.
+/datum/tutorial/switch_hands
+	grandfather_date = "2023-01-07"
+
+	var/stage = STAGE_SHOULD_SWAP_HAND
+	var/atom/movable/screen/hand_preview
+
+	// So that they don't just drop the item
+	var/hand_to_watch
+
+/datum/tutorial/switch_hands/New(mob/user)
+	. = ..()
+
+	hand_to_watch = (user.active_hand_index % user.held_items.len) + 1
+
+/datum/tutorial/switch_hands/Destroy(force, ...)
+	user.client?.screen -= hand_preview
+	QDEL_NULL(hand_preview)
+
+	return ..()
+
+/datum/tutorial/switch_hands/perform(list/params)
+	create_hand_preview(params[SCREEN_LOC])
+	addtimer(CALLBACK(src, PROC_REF(show_instructions)), TIME_TO_START_MOVING_HAND_ICON)
+
+	RegisterSignal(user, COMSIG_MOB_SWAP_HANDS, PROC_REF(on_swap_hands))
+	RegisterSignal(user, COMSIG_LIVING_PICKED_UP_ITEM, PROC_REF(on_pick_up_item))
+
+/datum/tutorial/switch_hands/perform_completion_effects_with_delay()
+	UnregisterSignal(user, list(COMSIG_MOB_SWAP_HANDS, COMSIG_LIVING_PICKED_UP_ITEM))
+	return 0
+
+/datum/tutorial/switch_hands/proc/create_hand_preview(initial_screen_loc)
+	hand_preview = animate_ui_element(
+		"hand_[hand_to_watch % 2 == 0 ? "r" : "l"]",
+		initial_screen_loc,
+		ui_hand_position(hand_to_watch),
+		TIME_TO_START_MOVING_HAND_ICON,
+	)
+
+/datum/tutorial/switch_hands/proc/show_instructions()
+	if (QDELETED(src))
+		return
+
+	switch (stage)
+		if (STAGE_SHOULD_SWAP_HAND)
+			var/hand_name = hand_to_watch % 2 == 0 ? "right" : "left"
+			show_instruction(keybinding_message(
+				/datum/keybinding/mob/swap_hands,
+				"Press '%KEY%' to use your [hand_name] hand",
+				"Click '<b>SWAP</b>' to use your [hand_name] hand",
+			))
+		if (STAGE_PICK_UP_ITEM)
+			show_instruction("Pick something up!")
+
+/datum/tutorial/switch_hands/proc/on_swap_hands()
+	SIGNAL_HANDLER
+
+	if (isnull(user.get_active_held_item()))
+		stage = STAGE_PICK_UP_ITEM
+		show_instructions()
+	else if (isnull(user.get_inactive_held_item()))
+		stage = STAGE_SHOULD_SWAP_HAND
+		show_instructions()
+	else
+		// You somehow got an item in both hands during the tutorial without switching hands.
+		// Good job I guess?
+		complete()
+
+/datum/tutorial/switch_hands/proc/on_pick_up_item()
+	SIGNAL_HANDLER
+
+	if (user.active_hand_index != hand_to_watch)
+		return
+
+	complete()
+
+#undef STAGE_PICK_UP_ITEM
+#undef STAGE_SHOULD_SWAP_HAND
+#undef TIME_TO_START_MOVING_HAND_ICON
@@ -208,10 +208,12 @@
 #include "tgui_create_message.dm"
 #include "timer_sanity.dm"
 #include "traitor.dm"
+#include "tutorial_sanity.dm"
 #include "unit_test.dm"
 #include "verify_config_tags.dm"
 #include "verify_emoji_names.dm"
 #include "wizard_loadout.dm"
+#include "worn_icons.dm"
 #ifdef REFERENCE_TRACKING_DEBUG //Don't try and parse this file if ref tracking isn't turned on. IE: don't parse ref tracking please mr linter
 #include "find_reference_sanity.dm"
 #endif
@@ -0,0 +1,19 @@
+/// Verifies that every tutorial has properly set variables
+/datum/unit_test/tutorial_sanity
+
+/datum/unit_test/tutorial_sanity/Run()
+	var/regex/regex_valid_date = regex(@"\d{4}-\d{2}-\d{2}")
+	var/list/keys = list()
+
+	for (var/datum/tutorial/tutorial_type as anything in SStutorials.tutorial_managers)
+		var/datum/tutorial_manager/tutorial_manager = SStutorials.tutorial_managers[tutorial_type]
+
+		var/grandfather_date = initial(tutorial_type.grandfather_date)
+		if (!isnull(grandfather_date))
+			TEST_ASSERT(regex_valid_date.Find(grandfather_date), "[tutorial_type] has an invalid grandfather_date ([grandfather_date])")
+
+		var/key = tutorial_manager.get_key()
+		TEST_ASSERT(!(key in keys), "[key] shows up twice")
+		TEST_ASSERT(length(key) < 64, "[key] is more than 64 characters, it won't fit in the SQL table.")
+
+	TEST_ASSERT_EQUAL(SStutorials.tutorial_managers.len, length(subtypesof(/datum/tutorial)), "Expected tutorial_managers to have one of every tutorial")
@@ -0,0 +1,117 @@
+/// Makes sure suit slot items aren't using CS:S fallbacks.
+/datum/unit_test/worn_icons
+	var/static/list/possible_icon_states = list()
+	/// additional_icon_location is for downstream modularity support for finding missing sprites in additonal DMI file locations.
+	/// Make sure this location is also present in tools/deploy.sh
+	/// If you need additional paths ontop of this second one, you can add another generate_possible_icon_states_list("your/folder/path/") below the if(additional_icon_location) block in Run(), and make sure to add that path to tools/deploy.sh as well.
+	var/additional_icon_location = null
+
+/datum/unit_test/worn_icons/proc/generate_possible_icon_states_list(directory_path)
+	if(!directory_path)
+		directory_path = "icons/mob/clothing/"
+	for(var/file_path in flist(directory_path))
+		if(findtext(file_path, ".dmi"))
+			for(var/sprite_icon in icon_states("[directory_path][file_path]", 1)) //2nd arg = 1 enables 64x64+ icon support, otherwise you'll end up with "sword0_1" instead of "sword"
+				possible_icon_states[sprite_icon] += list("[directory_path][file_path]")
+		else
+			possible_icon_states += generate_possible_icon_states_list("[directory_path][file_path]")
+
+/datum/unit_test/worn_icons/Run()
+	generate_possible_icon_states_list()
+	if(additional_icon_location)
+		generate_possible_icon_states_list(additional_icon_location)
+
+	var/list/already_warned_icons = list()
+
+	for(var/obj/item/item_path as anything in (subtypesof(/obj/item) - typesof(/obj/item/mod)))
+		var/cached_slot_flags = initial(item_path.slot_flags)
+		if(!cached_slot_flags || (cached_slot_flags & ITEM_SLOT_LPOCKET) || (cached_slot_flags & ITEM_SLOT_RPOCKET) || initial(item_path.item_flags) & ABSTRACT)
+			continue
+
+
+		if(initial(item_path.greyscale_colors) && initial(item_path.greyscale_config_worn)) //GAGS has its own unit test.
+			continue
+
+		var/worn_icon = initial(item_path.worn_icon) //override icon file. where our sprite is contained if set. (ie modularity stuff)
+		var/worn_icon_state = initial(item_path.worn_icon_state) //overrides icon_state.
+		var/icon_state = worn_icon_state || initial(item_path.icon_state) //icon_state. what sprite name we are looking for.
+
+
+		if(isnull(icon_state))
+			continue //no sprite for the item.
+		if(icon_state in already_warned_icons)
+			continue
+
+		var/match_message
+		if(icon_state in possible_icon_states)
+			for(var/file_place in possible_icon_states[icon_state])
+				match_message += (match_message ? " & '[file_place]'" : " - Matching sprite found in: '[file_place]'")
+
+		if(worn_icon) //easiest to check since we override everything. this automatically includes downstream support.
+			if(!(icon_state in icon_states(worn_icon, 1)))
+				TEST_FAIL("[item_path] using invalid [worn_icon_state ? "worn_icon_state" : "icon_state"], \"[icon_state]\" in worn_icon override file, '[worn_icon]'[match_message]")
+			continue
+
+		var/icon_file //checks against all the default icon locations if one isn't defined.
+		var/fail_reasons
+		var/spacer
+		if(cached_slot_flags & ITEM_SLOT_BACK)
+			icon_file = 'icons/mob/clothing/back.dmi'
+
+			if(!(icon_state in icon_states(icon_file, 1)))
+				already_warned_icons += icon_state
+				fail_reasons += "[item_path] using invalid [worn_icon_state ? "worn_icon_state" : "icon_state"], \"[icon_state]\" in '[icon_file]'[match_message]"
+				spacer = "\n\t"
+
+		if(cached_slot_flags & ITEM_SLOT_ID)
+			icon_file = 'icons/mob/clothing/id.dmi'
+			if(!(icon_state in icon_states(icon_file, 1)))
+				already_warned_icons += icon_state
+				fail_reasons += "[spacer][item_path] using invalid [worn_icon_state ? "worn_icon_state" : "icon_state"], \"[icon_state]\" in '[icon_file]'[match_message]"
+				spacer = "\n\t"
+
+		if(cached_slot_flags & ITEM_SLOT_GLOVES)
+			icon_file = 'icons/mob/clothing/hands.dmi'
+			if(!(icon_state in icon_states(icon_file, 1)))
+				already_warned_icons += icon_state
+				fail_reasons += "[spacer][item_path] using invalid [worn_icon_state ? "worn_icon_state" : "icon_state"], \"[icon_state]\" in '[icon_file]'[match_message]"
+				spacer = "\n\t"
+
+		if(cached_slot_flags & ITEM_SLOT_EYES)
+			icon_file = 'icons/mob/clothing/eyes.dmi'
+			if(!(icon_state in icon_states(icon_file, 1)))
+				already_warned_icons += icon_state
+				fail_reasons += "[spacer][item_path] using invalid [worn_icon_state ? "worn_icon_state" : "icon_state"], \"[icon_state]\" in '[icon_file]'[match_message]"
+				spacer = "\n\t"
+
+		if(cached_slot_flags & ITEM_SLOT_EARS)
+			icon_file = 'icons/mob/clothing/ears.dmi'
+			if(!(icon_state in icon_states(icon_file, 1)))
+				already_warned_icons += icon_state
+				fail_reasons += "[spacer][item_path] using invalid [worn_icon_state ? "worn_icon_state" : "icon_state"], \"[icon_state]\" in '[icon_file]'[match_message]"
+				spacer = "\n\t"
+
+		if(cached_slot_flags & ITEM_SLOT_NECK)
+			icon_file = 'icons/mob/clothing/neck.dmi'
+			if(!(icon_state in icon_states(icon_file, 1)))
+				already_warned_icons += icon_state
+				fail_reasons += "[spacer][item_path] using invalid [worn_icon_state ? "worn_icon_state" : "icon_state"], \"[icon_state]\" in '[icon_file]'[match_message]"
+				spacer = "\n\t"
+
+		if(cached_slot_flags & ITEM_SLOT_MASK)
+			icon_file = 'icons/mob/clothing/mask.dmi'
+			if(!(icon_state in icon_states(icon_file, 1)))
+				already_warned_icons += icon_state
+				fail_reasons += "[spacer][item_path] using invalid [worn_icon_state ? "worn_icon_state" : "icon_state"], \"[icon_state]\" in '[icon_file]'[match_message]"
+				spacer = "\n\t"
+
+		if(cached_slot_flags & ITEM_SLOT_BELT)
+			icon_file = 'icons/mob/clothing/belt.dmi'
+			if(!(icon_state in icon_states(icon_file, 1)))
+				already_warned_icons += icon_state
+				fail_reasons += "[spacer][item_path] using invalid [worn_icon_state ? "worn_icon_state" : "icon_state"], \"[icon_state]\" in '[icon_file]'[match_message]"
+				spacer = "\n\t"
+
+		if(fail_reasons)
+			TEST_FAIL(fail_reasons)
+
@@ -648,3 +648,7 @@ PR_ANNOUNCEMENTS_PER_ROUND 5

 ## Uncomment to block granting profiling privileges to users with R_DEBUG, for performance purposes
 #FORBID_ADMIN_PROFILING
+
+## Comment to disable sending a toast notification on the host server when initializations complete.
+## Even if this is enabled, a notification will only be sent if there are no clients connected.
+TOAST_NOTIFICATION_ON_INIT
@@ -556,3 +556,8 @@ MAXFINE 2000
 ## Comment if you wish to enable title music playing at the lobby screen. This flag is disabled by default to facilitate better code testing on local machines.
 ## Do keep in mind that this flag will not affect individual player's preferences: if they opt-out on your server, it will never play for them.
 DISALLOW_TITLE_MUSIC
+
+## If enabled, then when the database is disabled, all players will get tutorials.
+## This is primarily useful for developing tutorials. If you have a proper DB setup, you
+## don't need (or want) this.
+#GIVE_TUTORIALS_WITHOUT_DB
@@ -1,5 +0,0 @@
-author: "SkyratBot"
-delete-after: True
-changes:
-  - rscadd: "you can flip eyepatches"
-  - bugfix: "blindfolds now take into consideration both eye colors for their color"
@@ -1,4 +0,0 @@
-author: "Big chungus wholesome 100"
-delete-after: True
-changes:
-  - bugfix: "Amputated and reattached limbs now get wounded based on their own biology, not the current owner's biology."
--- a/Show More
+++ b/Show More