extern char ChooseOption(float options[7]);
extern void ClearField(int scr);
extern unsigned char GetBlock(int scr, int y, int x);
-extern void SetBlock(int scr, int y, int x, unsigned char type);
extern int RefreshBoard(int scr);
extern int GlanceFunc(int scr, int y, int x, unsigned char type);
extern int ShadowFunc(int scr, int y, int x, unsigned char type);