-extern void DisplayLevel(void);
-extern void DrawField(int X, int Y);
-extern void DrawFieldAnimated(int X, int Y);
-extern void DrawFieldNoAnimated(int X, int Y);
-extern void DrawSprite(int X, int Y, int SpritePos);
-extern void DrawImage(int X, int Y, int graphic);
+void DisplayLevel(void);
+void DrawField(int X, int Y);
+void DrawFieldAnimated(int X, int Y);
+void DrawFieldNoAnimated(int X, int Y);
+void DrawSprite(int X, int Y, int SpritePos);
+void DrawImage(int X, int Y, int graphic);