void DrawScreenElementThruMask(int, int, int);
void DrawLevelElementThruMask(int, int, int);
void DrawLevelFieldThruMask(int, int);
-void DrawCrumbledSand(int, int);
+void DrawLevelFieldCrumbledSand(int, int);
+void DrawLevelFieldCrumbledSandDigging(int, int, int, int);
void DrawScreenElement(int, int, int);
void DrawLevelElement(int, int, int);
void DrawScreenField(int, int);