+boolean swapTiles_EM(boolean);
+boolean getTeamMode_EM(void);
+boolean isActivePlayer_EM(int);
+
+void PlayLevelSound_EM(int, int, int, int);
+void InitGraphicInfo_EM(void);
+boolean CheckSingleStepMode_EM(byte action[], int, boolean, boolean, boolean);
+
+void SetGfxAnimation_EM(struct GraphicInfo_EM *, int, int, int, int);
+void getGraphicSourceObjectExt_EM(struct GraphicInfo_EM *, int, int, int, int);
+void getGraphicSourcePlayerExt_EM(struct GraphicInfo_EM *, int, int, int);
+
+
+// ============================================================================
+// functions and definitions exported from main program to game_sp
+// ============================================================================
+
+void CheckSingleStepMode_SP(boolean, boolean);
+
+void getGraphicSource_SP(struct GraphicInfo_SP *, int, int, int, int);
+int getGraphicInfo_Delay(int);
+boolean isNextAnimationFrame_SP(int, int);
+
+
+// ============================================================================
+// functions and definitions exported from main program to game_mm
+// ============================================================================
+
+void SetDrawtoField(int);
+
+int el2img_mm(int);
+
+void CheckSingleStepMode_MM(boolean, boolean);
+
+int getGraphicAnimationFrame(int, int);
+void getGraphicSource(int, int, Bitmap **, int *, int *);
+void getMiniGraphicSource(int, Bitmap **, int *, int *);
+void getSizedGraphicSource(int, int, int, Bitmap **, int *, int *);
+
+
+#endif // ENGINES_H