diff --git a/build/Version.props b/build/Version.props
index 99cef97f0d..5022bac52e 100644
--- a/build/Version.props
+++ b/build/Version.props
@@ -9,7 +9,7 @@
     <TgsCommonLibraryVersion>7.0.0</TgsCommonLibraryVersion>
     <TgsApiLibraryVersion>11.1.2</TgsApiLibraryVersion>
     <TgsClientVersion>13.0.0</TgsClientVersion>
-    <TgsDmapiVersion>6.5.4</TgsDmapiVersion>
+    <TgsDmapiVersion>6.6.0</TgsDmapiVersion>
     <TgsInteropVersion>5.6.2</TgsInteropVersion>
     <TgsHostWatchdogVersion>1.4.0</TgsHostWatchdogVersion>
     <TgsContainerScriptVersion>1.2.1</TgsContainerScriptVersion>
diff --git a/src/DMAPI/tgs.dm b/src/DMAPI/tgs.dm
index d0466b806f..9825cd118b 100644
--- a/src/DMAPI/tgs.dm
+++ b/src/DMAPI/tgs.dm
@@ -1,6 +1,6 @@
 // tgstation-server DMAPI
 
-#define TGS_DMAPI_VERSION "6.5.4"
+#define TGS_DMAPI_VERSION "6.6.0"
 
 // All functions and datums outside this document are subject to change with any version and should not be relied on.
 
@@ -129,6 +129,13 @@
 /// DreamDaemon Ultrasafe security level.
 #define TGS_SECURITY_ULTRASAFE 2
 
+/// DreamDaemon public visibility level.
+#define TGS_VISIBILITY_PUBLIC 0
+/// DreamDaemon private visibility level.
+#define TGS_VISIBILITY_PRIVATE 1
+/// DreamDaemon invisible visibility level.
+#define TGS_VISIBILITY_INVISIBLE 2
+
 //REQUIRED HOOKS
 
 /**
@@ -458,6 +465,10 @@
 /world/proc/TgsSecurityLevel()
 	return
 
+/// Returns the current BYOND visibility level as a TGS_VISIBILITY_ define if TGS is present, null otherwise. Requires TGS to be using interop API version 5 or higher otherwise the string "___unimplemented" wil be returned. This function may sleep if the call to [/world/proc/TgsNew] is sleeping!
+/world/proc/TgsVisibility()
+	return
+
 /// Returns a list of active [/datum/tgs_revision_information/test_merge]s if TGS is present, null otherwise. This function may sleep if the call to [/world/proc/TgsNew] is sleeping!
 /world/proc/TgsTestMerges()
 	return
diff --git a/src/DMAPI/tgs/core/core.dm b/src/DMAPI/tgs/core/core.dm
index aa4084904b..b9a9f27a28 100644
--- a/src/DMAPI/tgs/core/core.dm
+++ b/src/DMAPI/tgs/core/core.dm
@@ -154,3 +154,8 @@
 	var/datum/tgs_api/api = TGS_READ_GLOBAL(tgs)
 	if(api)
 		return api.SecurityLevel()
+
+/world/TgsVisibility()
+	var/datum/tgs_api/api = TGS_READ_GLOBAL(tgs)
+	if(api)
+		return api.Visibility()
diff --git a/src/DMAPI/tgs/core/datum.dm b/src/DMAPI/tgs/core/datum.dm
index 68b0330fe8..93377079aa 100644
--- a/src/DMAPI/tgs/core/datum.dm
+++ b/src/DMAPI/tgs/core/datum.dm
@@ -57,3 +57,6 @@ TGS_PROTECT_DATUM(/datum/tgs_api)
 
 /datum/tgs_api/proc/SecurityLevel()
 	return TGS_UNIMPLEMENTED
+
+/datum/tgs_api/proc/Visibility()
+	return TGS_UNIMPLEMENTED
diff --git a/src/DMAPI/tgs/v5/_defines.dm b/src/DMAPI/tgs/v5/_defines.dm
index f973338daa..bdcd4e4dd5 100644
--- a/src/DMAPI/tgs/v5/_defines.dm
+++ b/src/DMAPI/tgs/v5/_defines.dm
@@ -48,6 +48,7 @@
 #define DMAPI5_RUNTIME_INFORMATION_REVISION "revision"
 #define DMAPI5_RUNTIME_INFORMATION_TEST_MERGES "testMerges"
 #define DMAPI5_RUNTIME_INFORMATION_SECURITY_LEVEL "securityLevel"
+#define DMAPI5_RUNTIME_INFORMATION_VISIBILITY "visibility"
 
 #define DMAPI5_CHAT_UPDATE_CHANNELS "channels"
 
diff --git a/src/DMAPI/tgs/v5/api.dm b/src/DMAPI/tgs/v5/api.dm
index 34cc43f876..45250efc46 100644
--- a/src/DMAPI/tgs/v5/api.dm
+++ b/src/DMAPI/tgs/v5/api.dm
@@ -4,6 +4,7 @@
 
 	var/instance_name
 	var/security_level
+	var/visibility
 
 	var/reboot_mode = TGS_REBOOT_MODE_NORMAL
 
@@ -54,6 +55,7 @@
 
 	version = new /datum/tgs_version(runtime_information[DMAPI5_RUNTIME_INFORMATION_SERVER_VERSION])
 	security_level = runtime_information[DMAPI5_RUNTIME_INFORMATION_SECURITY_LEVEL]
+	visibility = runtime_information[DMAPI5_RUNTIME_INFORMATION_VISIBILITY]
 	instance_name = runtime_information[DMAPI5_RUNTIME_INFORMATION_INSTANCE_NAME]
 
 	var/list/revisionData = runtime_information[DMAPI5_RUNTIME_INFORMATION_REVISION]
@@ -252,3 +254,7 @@
 /datum/tgs_api/v5/SecurityLevel()
 	RequireInitialBridgeResponse()
 	return security_level
+
+/datum/tgs_api/v5/Visibility()
+	RequireInitialBridgeResponse()
+	return visibility
diff --git a/src/DMAPI/tgs/v5/undefs.dm b/src/DMAPI/tgs/v5/undefs.dm
index c679737dfc..f163adaaaf 100644
--- a/src/DMAPI/tgs/v5/undefs.dm
+++ b/src/DMAPI/tgs/v5/undefs.dm
@@ -48,6 +48,7 @@
 #undef DMAPI5_RUNTIME_INFORMATION_REVISION
 #undef DMAPI5_RUNTIME_INFORMATION_TEST_MERGES
 #undef DMAPI5_RUNTIME_INFORMATION_SECURITY_LEVEL
+#undef DMAPI5_RUNTIME_INFORMATION_VISIBILITY
 
 #undef DMAPI5_CHAT_UPDATE_CHANNELS
 
diff --git a/tests/DMAPI/LongRunning/Test.dm b/tests/DMAPI/LongRunning/Test.dm
index a77c3377b5..68597e10d0 100644
--- a/tests/DMAPI/LongRunning/Test.dm
+++ b/tests/DMAPI/LongRunning/Test.dm
@@ -17,6 +17,12 @@
 
 	log << "Running in security level: [sec]"
 
+	var/vis = TgsVisibility()
+	if(isnull(vis))
+		FailTest("TGS Visibility was null!")
+
+	log << "Running in visibility: [vis]"
+
 	if(params["expect_chat_channels"])
 		var/list/channels = TgsChatChannelInfo()
 		if(!length(channels))