diff --git a/src/BizHawk.Client.Common/movie/import/DoomLmpImport.cs b/src/BizHawk.Client.Common/movie/import/DoomLmpImport.cs
index c3276c96f3..a23bc67eb8 100644
--- a/src/BizHawk.Client.Common/movie/import/DoomLmpImport.cs
+++ b/src/BizHawk.Client.Common/movie/import/DoomLmpImport.cs
@@ -1,3 +1,5 @@
+using System.Buffers.Binary;
+
 using BizHawk.Common.IOExtensions;
 using BizHawk.Emulation.Common;
 using BizHawk.Emulation.Cores;
@@ -49,6 +51,7 @@ namespace BizHawk.Client.Common
 			var monstersRespawn   = false;
 			var fastMonsters      = false;
 			var noMonsters        = false;
+			//var rngSeed           = 1993U;
 
 			Result.Movie.HeaderEntries[HeaderKeys.Core] = CoreNames.DSDA;
 			Result.Movie.SystemID = VSystemID.Raw.Doom;
@@ -106,6 +109,10 @@ namespace BizHawk.Client.Common
 			}
 			else // Boom territory
 			{
+				Result.Errors.Add($"Found BOOM demo format: v{(int)version}. Importing it is currently not supported.");
+				return;
+
+				/*
 				i++; // skip to signature's second byte
 				var portID = input[i++];
 				i += 4; // skip the rest of the signature
@@ -184,12 +191,10 @@ namespace BizHawk.Client.Common
 				monstersRespawn = input[i++] is not 0;
 				fastMonsters    = input[i++] is not 0;
 				noMonsters      = input[i++] is not 0;
-
-				var optionsSize = compLevel == DSDA.CompatibilityLevel.MBF21 ? 21 + 25 : 64;
-				i += optionsSize - 9; // subtract the options we already parsed
-
-				if (version == DemoVersion.Boom_2_00)
-					i += 256 - optionsSize;
+				i++; // demo insurance
+				rngSeed         = BinaryPrimitives.ReadUInt32BigEndian(input.AsSpan(i, 4));
+				i = 0x4D;
+				*/
 			}
 
 			DSDA.DoomSyncSettings syncSettings = new()
@@ -205,13 +210,14 @@ namespace BizHawk.Client.Common
 				NoMonsters = noMonsters,
 				TurningResolution = turningResolution,
 				RenderWipescreen = false,
+				//RNGSeed = rngSeed,
 			};
 
 			syncSettings.Player1Present = input[i++] is not 0;
 			syncSettings.Player2Present = input[i++] is not 0;
 			syncSettings.Player3Present = input[i++] is not 0;
 			syncSettings.Player4Present = input[i++] is not 0;
-
+			/*
 			if (compLevel >= DSDA.CompatibilityLevel.Boom_Compatibility
 				&& version >= DemoVersion.Boom_2_00)
 			{
@@ -219,7 +225,7 @@ namespace BizHawk.Client.Common
 				var g_maxplayers = 4;
 				i += FUTURE_MAXPLAYERS - g_maxplayers;
 			}
-
+			*/
 			Result.Movie.SyncSettingsJson = ConfigService.SaveWithType(syncSettings);
 
 			var doomController = new DoomControllerDeck(
diff --git a/src/BizHawk.Emulation.Cores/Computers/Doom/DSDA.ISettable.cs b/src/BizHawk.Emulation.Cores/Computers/Doom/DSDA.ISettable.cs
index 90e9c984e7..7145c6ac86 100644
--- a/src/BizHawk.Emulation.Cores/Computers/Doom/DSDA.ISettable.cs
+++ b/src/BizHawk.Emulation.Cores/Computers/Doom/DSDA.ISettable.cs
@@ -403,7 +403,12 @@ namespace BizHawk.Emulation.Cores.Computers.Doom
 			[Description("How fast the Doom player will run when using the mouse.")]
 			[DefaultValue(1)]
 			public int MouseRunSensitivity { get; set; }
-
+			/*
+			[DisplayName("Initial RNG Seed")]
+			[Description("Boom demos.")]
+			[DefaultValue(1993)]
+			public uint RNGSeed { get; set; }
+			*/
 			[DisplayName("Player 1 Hexen Class")]
 			[Description("The Hexen class to use for player 1. Has no effect for Doom / Heretic")]
 			[DefaultValue(HexenClass.Fighter)]
@@ -441,7 +446,8 @@ namespace BizHawk.Emulation.Cores.Computers.Doom
 					Player3Class = (int)Player3Class,
 					Player4Class = (int)Player4Class,
 					PreventLevelExit = PreventLevelExit ? 1 : 0,
-					PreventGameEnd = PreventGameEnd ? 1 : 0
+					PreventGameEnd = PreventGameEnd ? 1 : 0,
+					//RNGSeed = RNGSeed,
 				};
 			}
 
diff --git a/src/BizHawk.Emulation.Cores/Computers/Doom/LibDSDA.cs b/src/BizHawk.Emulation.Cores/Computers/Doom/LibDSDA.cs
index 33469b3e0b..1972478afb 100644
--- a/src/BizHawk.Emulation.Cores/Computers/Doom/LibDSDA.cs
+++ b/src/BizHawk.Emulation.Cores/Computers/Doom/LibDSDA.cs
@@ -36,6 +36,7 @@ namespace BizHawk.Emulation.Cores.Computers.Doom
 			public int Player4Class;
 			public int PreventLevelExit;
 			public int PreventGameEnd;
+			//public uint RNGSeed;
 		}
 
 		[StructLayout(LayoutKind.Sequential)]
diff --git a/waterbox/dsda/BizhawkInterface.c b/waterbox/dsda/BizhawkInterface.c
index ad0875c299..6bb6277bc2 100644
--- a/waterbox/dsda/BizhawkInterface.c
+++ b/waterbox/dsda/BizhawkInterface.c
@@ -283,6 +283,9 @@ ECL_EXPORT int dsda_init(struct InitSettings *settings, int argc, char **argv)
     break;
   }
 
+  //if (compatibility_level >= boom_202_compatibility)
+  //  rngseed = settings->RNGSeed;
+
   // Initializing audio
   I_SetSoundCap();
   I_InitSound();
diff --git a/waterbox/dsda/BizhawkInterface.h b/waterbox/dsda/BizhawkInterface.h
index 992b3e4571..c1d425e7f2 100644
--- a/waterbox/dsda/BizhawkInterface.h
+++ b/waterbox/dsda/BizhawkInterface.h
@@ -26,6 +26,7 @@ extern void headlessSetTickCommand(int playerId, int forwardSpeed, int strafingS
 extern void headlessGetMapName(char *outString);
 extern void headlessSetSaveStatePointer(void *savePtr, int saveStateSize);
 extern size_t headlessGetEffectiveSaveSize();
+extern unsigned int rngseed;
 
 // Video
 extern void headlessUpdateVideo();
@@ -140,6 +141,7 @@ struct InitSettings
   int Player4Class;
   int PreventLevelExit;
   int PreventGameEnd;
+  //unsigned int RNGSeed;
 } __attribute__((packed));
 
 struct PackedPlayerInput