+boolean LoadNativeLevel_BD(char *, int, boolean);
+boolean SaveNativeLevel_BD(char *);
+
+void PreparePreviewTileBitmap_BD(Bitmap *, int);
+void SetPreviewTileBitmapReference_BD(Bitmap *);
+Bitmap *GetPreviewTileBitmap_BD(Bitmap *);
+
+unsigned int InitEngineRandom_BD(int);
+void InitGameEngine_BD(void);
+void GameActions_BD(byte[MAX_PLAYERS]);
+void CoverScreen_BD(void);
+
+void BlitScreenToBitmap_BD(Bitmap *);
+void RedrawPlayfield_BD(boolean);