diff --git a/source/build/include/baselayer.h b/source/build/include/baselayer.h
index 5edd7e8c4..a53de437f 100644
--- a/source/build/include/baselayer.h
+++ b/source/build/include/baselayer.h
@@ -38,105 +38,7 @@ extern int32_t qsetmode;
 #define in3dmode() (qsetmode==200)
 
 extern int32_t g_logFlushWindow;
-bool System_WantGuiCapture();	// During playing this tells us whether the game must be paused due to active GUI elememts.
-
-
-#include "print.h"
-
-struct GameStats
-{
-	int kill, tkill;
-	int secret, tsecret;
-	int timesecnd;
-	int frags;
-};
-
-struct FNewGameStartup
-{
-	int Episode;
-	int Level;
-	int Skill;
-	int CustomLevel1;
-	int CustomLevel2;
-};
-
-struct FSavegameInfo
-{
-	const char *savesig;
-	int minsavever;
-	int currentsavever;
-};
-
-struct FSaveGameNode
-{
-	FString SaveTitle;
-	FString Filename;
-	bool bOldVersion = false;
-	bool bMissingWads = false;
-	bool bNoDelete = false;
-	bool bIsExt = false;
-
-	bool isValid() const
-	{
-		return Filename.IsNotEmpty() && !bOldVersion && !bMissingWads;
-	}
-};
-
-
-enum EMenuSounds : int;
-
-struct GameInterface
-{
-	virtual const char* Name() { return "$"; }
-	virtual ~GameInterface() {}
-	virtual bool GenerateSavePic() { return false; }
-	virtual void faketimerhandler() {} // This is a remnant of older versions, but Blood backend has not updated yet.
-	virtual int app_main() = 0;
-	virtual void UpdateScreenSize() {}
-	virtual void FreeGameData() {}
-	virtual bool validate_hud(int) { return true; }
-	virtual void set_hud_layout(int size) = 0;
-	virtual void set_hud_scale(int size) {}
-	virtual FString statFPS() { return "FPS display not available"; }
-	virtual GameStats getStats() { return {}; }
-	virtual void DrawNativeMenuText(int fontnum, int state, double xpos, double ypos, float fontscale, const char* text, int flags) {}
-	virtual void MainMenuOpened() {}
-	virtual void MenuOpened() {}
-	virtual void MenuClosed() {}
-	virtual void MenuSound(EMenuSounds snd) {}
-	virtual bool CanSave() { return true; }
-	virtual void CustomMenuSelection(int menu, int item) {}
-	virtual void StartGame(FNewGameStartup& gs) {}
-	virtual FSavegameInfo GetSaveSig() { return { "", 0, 0}; }
-	virtual bool DrawSpecialScreen(const DVector2 &origin, int tilenum) { return false; }
-	virtual void DrawCenteredTextScreen(const DVector2& origin, const char* text, int position, bool withbg = true) {}
-	virtual void DrawMenuCaption(const DVector2& origin, const char* text) {}
-	virtual bool SaveGame(FSaveGameNode*) { return false; }
-	virtual bool LoadGame(FSaveGameNode*) { return false; }
-	virtual bool CleanupForLoad() { return true; }
-	virtual void DoPrintMessage(int prio, const char*) {}
-	void PrintMessage(int prio, const char*fmt, ...)
-	{
-		va_list ap;
-		va_start(ap, fmt);
-		FString f;
-		f.VFormat(fmt, ap);
-		DoPrintMessage(prio, f);
-	}
-	virtual void DrawPlayerSprite(const DVector2& origin, bool onteam) {}
-	virtual void QuitToTitle() {}
-	virtual void SetAmbience(bool on) {}
-	virtual FString GetCoordString() { return "'stat coord' not implemented"; }
-	virtual int GetStringTile(int font, const char* t, int f) { return -1; }
-
-};
-
-extern GameInterface* gi;
-extern double g_beforeSwapTime;
-
-
-void ImGui_Begin_Frame();
-
 
+#include "gamestruct.h"
 #endif // baselayer_h_
 
diff --git a/source/core/gamestruct.h b/source/core/gamestruct.h
new file mode 100644
index 000000000..e20368a85
--- /dev/null
+++ b/source/core/gamestruct.h
@@ -0,0 +1,101 @@
+#pragma once
+
+bool System_WantGuiCapture();	// During playing this tells us whether the game must be paused due to active GUI elememts.
+
+#include <stdint.h>
+#include "print.h"
+
+struct GameStats
+{
+	int kill, tkill;
+	int secret, tsecret;
+	int timesecnd;
+	int frags;
+};
+
+struct FNewGameStartup
+{
+	int Episode;
+	int Level;
+	int Skill;
+	int CustomLevel1;
+	int CustomLevel2;
+};
+
+struct FSavegameInfo
+{
+	const char *savesig;
+	int minsavever;
+	int currentsavever;
+};
+
+struct FSaveGameNode
+{
+	FString SaveTitle;
+	FString Filename;
+	bool bOldVersion = false;
+	bool bMissingWads = false;
+	bool bNoDelete = false;
+	bool bIsExt = false;
+
+	bool isValid() const
+	{
+		return Filename.IsNotEmpty() && !bOldVersion && !bMissingWads;
+	}
+};
+
+
+enum EMenuSounds : int;
+
+struct GameInterface
+{
+	virtual const char* Name() { return "$"; }
+	virtual ~GameInterface() {}
+	virtual bool GenerateSavePic() { return false; }
+	virtual void faketimerhandler() {} // This is a remnant of older versions, but Blood backend has not updated yet.
+	virtual int app_main() = 0;
+	virtual void UpdateScreenSize() {}
+	virtual void FreeGameData() {}
+	virtual bool validate_hud(int) { return true; }
+	virtual void set_hud_layout(int size) = 0;
+	virtual void set_hud_scale(int size) {}
+	virtual FString statFPS() { return "FPS display not available"; }
+	virtual GameStats getStats() { return {}; }
+	virtual void DrawNativeMenuText(int fontnum, int state, double xpos, double ypos, float fontscale, const char* text, int flags) {}
+	virtual void MainMenuOpened() {}
+	virtual void MenuOpened() {}
+	virtual void MenuClosed() {}
+	virtual void MenuSound(EMenuSounds snd) {}
+	virtual bool CanSave() { return true; }
+	virtual void CustomMenuSelection(int menu, int item) {}
+	virtual void StartGame(FNewGameStartup& gs) {}
+	virtual FSavegameInfo GetSaveSig() { return { "", 0, 0}; }
+	virtual bool DrawSpecialScreen(const DVector2 &origin, int tilenum) { return false; }
+	virtual void DrawCenteredTextScreen(const DVector2& origin, const char* text, int position, bool withbg = true) {}
+	virtual void DrawMenuCaption(const DVector2& origin, const char* text) {}
+	virtual bool SaveGame(FSaveGameNode*) { return false; }
+	virtual bool LoadGame(FSaveGameNode*) { return false; }
+	virtual bool CleanupForLoad() { return true; }
+	virtual void DoPrintMessage(int prio, const char*) {}
+	void PrintMessage(int prio, const char*fmt, ...)
+	{
+		va_list ap;
+		va_start(ap, fmt);
+		FString f;
+		f.VFormat(fmt, ap);
+		DoPrintMessage(prio, f);
+	}
+	virtual void DrawPlayerSprite(const DVector2& origin, bool onteam) {}
+	virtual void QuitToTitle() {}
+	virtual void SetAmbience(bool on) {}
+	virtual FString GetCoordString() { return "'stat coord' not implemented"; }
+	virtual int GetStringTile(int font, const char* t, int f) { return -1; }
+
+};
+
+extern GameInterface* gi;
+extern double g_beforeSwapTime;
+
+
+void ImGui_Begin_Frame();
+