void DrawLevelFieldThruMask(int, int);
void DrawLevelFieldCrumbledSand(int, int);
void DrawLevelFieldCrumbledSandDigging(int, int, int, int);
+void DrawLevelFieldCrumbledSandNeighbours(int, int);
void DrawScreenElement(int, int, int);
void DrawLevelElement(int, int, int);
void DrawScreenField(int, int);