Add footstep sounds to almost every single tile.

Shuttle tiles, default floors are still "regular".
Lava, sand, water, grass, beach, mining turfs all have sounds playing now for each footstep. <3

Massive credit to @Arokha for helping me figure out the floor system and sitting through getting it put together. <3 <3 <3

code/game/turfs/flooring/flooring.dm

@@ -26,9 +26,10 @@ var/list/flooring_types
 	var/name = "floor"
 	var/desc
 	var/icon
-	var/icon_base
+	var/icon_base // initial base icon_state without edges or corners.
 
-	var/has_base_range
+	var/has_base_range // This will pick between a range of 0 - x. Number icon_states accordingly. 
+					   // Note that this will append a 0 - x number automatically to icon_base, but NOT the dmi. Do icon_base = "grass", but name grass0 inside the dmi. etc etc.
 	var/has_damage_range
 	var/has_burn_range
 	var/damage_temperature
@@ -42,17 +43,69 @@ var/list/flooring_types
 	var/descriptor = "tiles"
 	var/flags
 	var/can_paint
-	var/list/footstep_sounds = list() // key=species name, value = list of soundss
+	var/list/footstep_sounds = list() // key=species name, value = list of sounds, 
+									  // For instance, footstep_sounds = list("key" = list(sound.ogg))
 
 /decl/flooring/grass
 	name = "grass"
 	desc = "Do they smoke grass out in space, Bowie? Or do they smoke AstroTurf?"
 	icon = 'icons/turf/flooring/grass.dmi'
 	icon_base = "grass"
-	has_base_range = 3
+	has_base_range = 1
 	damage_temperature = T0C+80
 	flags = TURF_HAS_EDGES | TURF_REMOVE_SHOVEL
 	build_type = /obj/item/stack/tile/grass
+	footstep_sounds = list("human" = list(
+		'sound/effects/footstep/grass1.ogg',
+		'sound/effects/footstep/grass2.ogg',
+		'sound/effects/footstep/grass3.ogg',
+		'sound/effects/footstep/grass4.ogg'))
+
+/decl/flooring/grass/sif // Subtype for Sif's grass.
+	name = "growth"
+	desc = "A natural moss that has adapted to the sheer cold climate."
+	icon = 'icons/turf/outdoors.dmi'
+	icon_base = "grass_sif"
+	has_base_range = 1
+
+/decl/flooring/water
+	name = "water"
+	desc = "Water is wet, gosh, who knew!"
+	icon = 'icons/turf/outdoors.dmi'
+	icon_base = "seashallow"
+	footstep_sounds = list("human" = list(
+		'sound/effects/footstep/water1.ogg',
+		'sound/effects/footstep/water2.ogg',
+		'sound/effects/footstep/water3.ogg',
+		'sound/effects/footstep/water4.ogg'))
+
+/decl/flooring/sand
+	name = "sand"
+	desc = "I don't like sand. It's coarse and rough and irritating and it gets everywhere."
+	icon = 'icons/misc/beach.dmi'
+	icon_base = "sand"
+	footstep_sounds = list("human" = list(
+		'sound/effects/footstep/HeavySand1.ogg',
+		'sound/effects/footstep/HeavySand2.ogg',
+		'sound/effects/footstep/HeavySand3.ogg',
+		'sound/effects/footstep/HeavySand4.ogg'))
+
+/decl/flooring/sand/desert // Subtype of sand, desert.
+	name = "desert"
+	desc = "I don't like sand. It's coarse and rough and irritating and it gets everywhere."
+	icon = 'icons/turf/desert.dmi'
+	icon_base = "desert"
+
+/decl/flooring/mud
+	name = "mud"
+	desc = "STICKY AND WET!"
+	icon = 'icons/turf/outdoors.dmi'
+	icon_base = "mud_dark"
+	footstep_sounds = list("human" = list(
+		'sound/effects/footstep/mud1.ogg',
+		'sound/effects/footstep/mud2.ogg',
+		'sound/effects/footstep/mud3.ogg',
+		'sound/effects/footstep/mud4.ogg'))
 
 /decl/flooring/asteroid
 	name = "coarse sand"
@@ -61,6 +114,26 @@ var/list/flooring_types
 	icon_base = "asteroid"
 	flags = TURF_HAS_EDGES | TURF_REMOVE_SHOVEL
 	build_type = null
+	footstep_sounds = list("human" = list(
+		'sound/effects/footstep/asteroid1.ogg',
+		'sound/effects/footstep/asteroid2.ogg',
+		'sound/effects/footstep/asteroid3.ogg',
+		'sound/effects/footstep/asteroid4.ogg',
+		'sound/effects/footstep/asteroid5.ogg'))
+
+/decl/flooring/dirt
+	name = "dirt"
+	desc = "Gritty and unpleasant, just like dirt."
+	icon = 'icons/turf/outdoors.dmi'
+	icon_base = "dirt-dark"
+	flags = TURF_HAS_EDGES | TURF_REMOVE_SHOVEL
+	build_type = null
+	footstep_sounds = list("human" = list(
+		'sound/effects/footstep/asteroid1.ogg',
+		'sound/effects/footstep/asteroid2.ogg',
+		'sound/effects/footstep/asteroid3.ogg',
+		'sound/effects/footstep/asteroid4.ogg',
+		'sound/effects/footstep/asteroid5.ogg'))
 
 /decl/flooring/snow
 	name = "snow"
@@ -315,6 +388,12 @@ var/list/flooring_types
 	apply_thermal_conductivity = 0.025
 	apply_heat_capacity = 325000
 	can_paint = 1
+	footstep_sounds = list("human" = list(
+		'sound/effects/footstep/hull1.ogg',
+		'sound/effects/footstep/hull2.ogg',
+		'sound/effects/footstep/hull3.ogg',
+		'sound/effects/footstep/hull4.ogg',
+		'sound/effects/footstep/hull5.ogg'))
 
 /decl/flooring/reinforced/circuit
 	name = "processing strata"
@@ -337,3 +416,13 @@ var/list/flooring_types
 	has_damage_range = 6
 	flags = TURF_ACID_IMMUNE | TURF_CAN_BREAK
 	can_paint = null
+
+/decl/flooring/lava // Defining this in case someone DOES step on lava and survive. Somehow.
+	name = "lava"
+	desc = "Lava. Y'know. Sets you on fire. AAAAAAAAAAA"
+	icon = 'icons/turf/outdoors.dmi'
+	icon_base = "lava"
+	footstep_sounds = list("human" = list(
+		'sound/effects/footstep/lava1.ogg',
+		'sound/effects/footstep/lava2.ogg',
+		'sound/effects/footstep/lava3.ogg'))

code/game/turfs/flooring/flooring_premade.dm

@@ -386,6 +386,7 @@
 	name = "snow"
 	icon = 'icons/turf/snow_new.dmi'
 	icon_state = "snow"
+	initial_flooring = /decl/flooring/snow
 	var/list/crossed_dirs = list()
 
 /turf/simulated/floor/snow/snow2

code/game/turfs/simulated/lava.dm

@@ -13,6 +13,7 @@
 	movement_cost = 2
 	can_build_into_floor = TRUE
 	can_dirty = FALSE
+	initial_flooring = /decl/flooring/lava // Defining this in case someone DOES step on lava and survive. Somehow.
 
 /turf/simulated/floor/lava/outdoors
 	outdoors = TRUE

code/game/turfs/simulated/outdoors/dirt.dm

@@ -1,6 +1,7 @@
-/turf/simulated/floor/outdoors/dirt
-	name = "dirt"
-	desc = "Quite dirty!"
-	icon_state = "dirt-dark"
-	edge_blending_priority = 2
-	turf_layers = list(/turf/simulated/floor/outdoors/rocks)
+/turf/simulated/floor/outdoors/dirt
+	name = "dirt"
+	desc = "Quite dirty!"
+	icon_state = "dirt-dark"
+	edge_blending_priority = 2
+	turf_layers = list(/turf/simulated/floor/outdoors/rocks)
+	initial_flooring = /decl/flooring/asteroid

code/game/turfs/simulated/outdoors/grass.dm

@@ -4,8 +4,9 @@ var/list/grass_types = list(
 
 /turf/simulated/floor/outdoors/grass
 	name = "grass"
-	icon_state = "grass"
+	icon_state = "grass0"
 	edge_blending_priority = 4
+	initial_flooring = /decl/flooring/grass
 	turf_layers = list(
 		/turf/simulated/floor/outdoors/rocks,
 		/turf/simulated/floor/outdoors/dirt
@@ -34,7 +35,8 @@ var/list/grass_types = list(
 
 /turf/simulated/floor/outdoors/grass/sif
 	name = "growth"
-	icon_state = "grass_sif"
+	icon_state = "grass_sif0"
+	initial_flooring = /decl/flooring/grass/sif
 	edge_blending_priority = 4
 	grass_chance = 5
 	var/tree_chance = 2
@@ -63,10 +65,6 @@ var/list/grass_types = list(
 	. = ..()
 
 /turf/simulated/floor/outdoors/grass/Initialize()
-	if(prob(50))
-		icon_state = "[initial(icon_state)]2"
-		//edge_blending_priority++
-
 	if(grass_chance && prob(grass_chance) && !check_density())
 		var/grass_type = pickweight(grass_types)
 		new grass_type(src)
@@ -79,14 +77,14 @@ var/list/grass_types = list(
 
 /turf/simulated/floor/outdoors/grass/forest
 	name = "thick grass"
-	icon_state = "grass-dark"
+	icon_state = "grass-dark0"
 	grass_chance = 80
 	//tree_chance = 20
 	edge_blending_priority = 5
 
 /turf/simulated/floor/outdoors/grass/sif/forest
 	name = "thick growth"
-	icon_state = "grass_sif_dark"
+	icon_state = "grass_sif_dark0"
 	edge_blending_priority = 5
 	tree_chance = 10
 	grass_chance = 0

code/game/turfs/simulated/outdoors/outdoors.dm

@@ -81,6 +81,7 @@ var/list/turf_edge_cache = list()
 	name = "mud"
 	icon_state = "mud_dark"
 	edge_blending_priority = 3
+	initial_flooring = /decl/flooring/mud
 
 /turf/simulated/floor/outdoors/rocks
 	name = "rocks"

code/game/turfs/simulated/water.dm

@@ -20,6 +20,8 @@
 
 /turf/simulated/floor/water/Initialize()
 	. = ..()
+	var/decl/flooring/F = get_flooring_data(/decl/flooring/water)
+	footstep_sounds = F?.footstep_sounds
 	update_icon()
 	handle_fish()
 

code/game/turfs/unsimulated/beach.dm

@@ -15,6 +15,7 @@
 	name = "Water"
 	icon_state = "water"
 	initialized = FALSE
+	movement_cost = 4 // Water should slow you down, just like simulated turf.
 
 /turf/unsimulated/beach/water/Initialize()
 	. = ..()
@@ -23,20 +24,17 @@
 /turf/simulated/floor/beach
 	name = "Beach"
 	icon = 'icons/misc/beach.dmi'
-	footstep_sounds = list("human" = list(
-		'sound/effects/footstep/carpet1.ogg',
-		'sound/effects/footstep/carpet2.ogg',
-		'sound/effects/footstep/carpet3.ogg',
-		'sound/effects/footstep/carpet4.ogg',
-		'sound/effects/footstep/carpet5.ogg'))
+	initial_flooring = /decl/flooring/sand
 
 /turf/simulated/floor/beach/sand
 	name = "Sand"
 	icon_state = "sand"
+	initial_flooring = /decl/flooring/sand
 
 /turf/simulated/floor/beach/sand/desert
 	icon = 'icons/turf/desert.dmi'
 	icon_state = "desert"
+	initial_flooring = /decl/flooring/sand/desert
 
 /turf/simulated/floor/beach/sand/desert/Initialize()
 	. = ..()
@@ -51,10 +49,24 @@
 /turf/simulated/floor/beach/water
 	name = "Water"
 	icon_state = "water"
+	movement_cost = 4 // Water should slow you down, just like the original simulated turf.
+	initial_flooring = /decl/flooring/water
 
 /turf/simulated/floor/beach/water/ocean
 	icon_state = "seadeep"
+	movement_cost = 8 // Deep water should be difficult to wade through.
+	initial_flooring = /decl/flooring/water/beach/deep
 
 /turf/simulated/floor/beach/water/Initialize()
 	. = ..()
 	add_overlay(image("icon"='icons/misc/beach.dmi',"icon_state"="water5","layer"=MOB_LAYER+0.1))
+
+/decl/flooring/water/beach/deep // We're custom-defining a 'deep' water turf for the beach.
+	name = "deep water"
+	desc = "Deep Ocean Water"
+	icon = 'icons/misc/beach.dmi'
+	icon_base = "seadeep"
+	footstep_sounds = list("human" = list(
+		'sound/effects/footstep/bubbles3.ogg', // No I don't get why it's named 3/4/5 either. Whatever.
+		'sound/effects/footstep/bubbles4.ogg',
+		'sound/effects/footstep/bubbles5.ogg'))

code/modules/mining/mine_turfs.dm

@@ -154,6 +154,8 @@ turf/simulated/mineral/floor/light_corner
 	if(random_icon)
 		dir = pick(alldirs)
 		. = INITIALIZE_HINT_LATELOAD
+	var/decl/flooring/F = get_flooring_data(/decl/flooring/sand)
+	footstep_sounds = F?.footstep_sounds
 
 /turf/simulated/mineral/LateInitialize()
 	if(density && mineral)