void DrawLevelElementShifted(int, int, int, int, int, int);
void DrawScreenElementThruMask(int, int, int);
void DrawLevelElementThruMask(int, int, int);
+void DrawLevelFieldThruMask(int, int);
void ErdreichAnbroeckeln(int, int);
void DrawScreenElement(int, int, int);
void DrawLevelElement(int, int, int);