diff --git a/source/common/engine/serializer.h b/source/common/engine/serializer.h
index e1f54d36e..7442edd2e 100644
--- a/source/common/engine/serializer.h
+++ b/source/common/engine/serializer.h
@@ -238,6 +238,12 @@ FSerializer &Serialize(FSerializer &arc, const char *key, TArray<T, TT> &value,
 	return arc;
 }
 
+template<int size> 
+FSerializer& Serialize(FSerializer& arc, const char* key, FixedBitArray<size>& value, FixedBitArray<size>* def)
+{
+	return arc.Array(key, value.Storage(), def ? def->Storage() : nullptr, value.StorageSize());
+}
+
 template<> FSerializer& Serialize(FSerializer& arc, const char* key, PClass*& clst, PClass** def);
 template<> FSerializer& Serialize(FSerializer& arc, const char* key, FFont*& font, FFont** def);
 template<> FSerializer &Serialize(FSerializer &arc, const char *key, Dictionary *&dict, Dictionary **def);
diff --git a/source/common/utility/tarray.h b/source/common/utility/tarray.h
index 7bafeb9ee..ebe83f984 100644
--- a/source/common/utility/tarray.h
+++ b/source/common/utility/tarray.h
@@ -1527,6 +1527,16 @@ public:
 	{
 		memset(&bytes[0], on ? -1 : 0, sizeof(bytes));
 	}
+
+	// These are for utilities that need access to the raw storage. The serializer needs this to do its work, for example.
+	uint8_t* Storage()
+	{
+		return bytes;
+	}
+	unsigned StorageSize() const
+	{
+		return sizeof(bytes);
+	}
 };
 
 // A wrapper to externally stored data.
diff --git a/source/core/gamestruct.h b/source/core/gamestruct.h
index cf63cef3f..1d6457200 100644
--- a/source/core/gamestruct.h
+++ b/source/core/gamestruct.h
@@ -77,8 +77,9 @@ struct GameInterface
 	virtual void DrawCenteredTextScreen(const DVector2& origin, const char* text, int position, bool withbg = true);
 	virtual double SmallFontScale() { return 1; }
 	virtual void DrawMenuCaption(const DVector2& origin, const char* text) {}
-	virtual bool SaveGame(FSaveGameNode*) { return false; }
-	virtual bool LoadGame(FSaveGameNode*) { return false; }
+	virtual bool SaveGame(FSaveGameNode*) { return true; }
+	virtual bool LoadGame(FSaveGameNode*) { return true; }
+	virtual void SerializeGameState(FSerializer& arc) {}
 	virtual bool CleanupForLoad() { return true; }
 	virtual void DrawPlayerSprite(const DVector2& origin, bool onteam) {}
 	virtual void QuitToTitle() {}
diff --git a/source/core/savegamehelp.cpp b/source/core/savegamehelp.cpp
index 0e2a36242..45ecec0dc 100644
--- a/source/core/savegamehelp.cpp
+++ b/source/core/savegamehelp.cpp
@@ -96,6 +96,20 @@ bool OpenSaveGameForRead(const char *name)
 
 	if (savereader != nullptr)
 	{
+		auto file = ReadSavegameChunk("info.json");
+		if (!file.isOpen())
+		{
+			FinishSavegameRead();
+			delete savereader;
+			return false;
+		}
+		if (G_ValidateSavegame(file, nullptr, false) <= 0)
+		{
+			FinishSavegameRead();
+			delete savereader;
+			return false;
+		}
+
 		FResourceLump* info = savereader->FindLump("session.json");
 		if (info == nullptr)
 		{
@@ -114,20 +128,7 @@ bool OpenSaveGameForRead(const char *name)
 		// Load system-side data from savegames.
 		SerializeSession(arc);
 		LoadEngineState();
-
-		auto file = ReadSavegameChunk("info.json");
-		if (!file.isOpen())
-		{
-			FinishSavegameRead();
-			delete savereader;
-			return false;
-		}
-		if (G_ValidateSavegame(file, nullptr, false) <= 0)
-		{
-			FinishSavegameRead();
-			delete savereader;
-			return false;
-		}
+		gi->SerializeGameState(arc);
 	}
 	return savereader != nullptr;
 }
@@ -220,10 +221,11 @@ bool OpenSaveGameForWrite(const char* filename, const char *name)
 	// Handle system-side modules that need to persist data in savegames here, in a central place.
 	savegamesession.OpenWriter(save_formatted);
 	SerializeSession(savegamesession);
+	SaveEngineState();
+	gi->SerializeGameState(savegamesession);
 	buff = savegamesession.GetCompressedOutput();
 	AddCompressedSavegameChunk("session.json", buff);
 
-	SaveEngineState();
 	auto picfile = WriteSavegameChunk("savepic.png");
 	WriteSavePic(picfile, 240, 180);
 	return true;
@@ -494,6 +496,7 @@ void SaveEngineState()
 	sv_prespriteextsave();
 	fw->Write(spriteext, sizeof(spriteext_t) * MAXSPRITES);
 	fw->Write(wallext, sizeof(wallext_t) * MAXWALLS);
+	fw->Write(&randomseed, sizeof(randomseed));
 	sv_postspriteext();
 	WriteMagic(fw);
 
@@ -556,6 +559,7 @@ void LoadEngineState()
 		fr.Read(&Numsprites, sizeof(Numsprites));
 		fr.Read(spriteext, sizeof(spriteext_t) * MAXSPRITES);
 		fr.Read(wallext, sizeof(wallext_t) * MAXWALLS);
+		fr.Read(&randomseed, sizeof(randomseed));
 		sv_postspriteext();
 	CheckMagic(fr);
 
diff --git a/source/games/duke/src/duke3d.h b/source/games/duke/src/duke3d.h
index 8787dd085..1e705c496 100644
--- a/source/games/duke/src/duke3d.h
+++ b/source/games/duke/src/duke3d.h
@@ -54,8 +54,7 @@ struct GameInterface : ::GameInterface
 	void DrawCenteredTextScreen(const DVector2& origin, const char* text, int position, bool bg) override;
 	double SmallFontScale() override { return isRR() ? 0.5 : 1.; }
 	void DrawMenuCaption(const DVector2& origin, const char* text) override;
-	bool SaveGame(FSaveGameNode*) override;
-	bool LoadGame(FSaveGameNode*) override;
+	void SerializeGameState(FSerializer& arc) override;
 	void QuitToTitle() override;
 	FString GetCoordString() override;
 	bool CheatAllowed(bool printmsg) override;
diff --git a/source/games/duke/src/savegame.cpp b/source/games/duke/src/savegame.cpp
index 0c8bae4da..9c4cdee95 100644
--- a/source/games/duke/src/savegame.cpp
+++ b/source/games/duke/src/savegame.cpp
@@ -328,7 +328,7 @@ FSerializer& Serialize(FSerializer& arc, const char* keyname, weaponhit& w, weap
 }
 
 
-void SerializeGlobals(FSerializer& arc)
+void GameInterface::SerializeGameState(FSerializer& arc)
 {
 	if (arc.isReading())
 	{
@@ -340,7 +340,7 @@ void SerializeGlobals(FSerializer& arc)
 		memset(ambienthitag, -1, sizeof(ambienthitag));
 		memset(ambientlotag, -1, sizeof(ambientlotag));
 	}
-	if (arc.BeginObject("globals"))
+	if (arc.BeginObject("duke.gamestate"))
 	{
 		arc("multimode", ud.multimode);
 		if (ud.multimode > 1) arc.Array("frags", &frags[0][0], MAXPLAYERS * MAXPLAYERS);
@@ -505,16 +505,4 @@ void SerializeGlobals(FSerializer& arc)
 	}
 }
 
-bool GameInterface::LoadGame(FSaveGameNode* sv)
-{
-	return 0;
-}
-
-bool GameInterface::SaveGame(FSaveGameNode* sv)
-{
-	return 0;
-}
-
-
-
 END_DUKE_NS