extern boolean Pushed[MAX_LEV_FIELDX][MAX_LEV_FIELDY];
extern unsigned long Changed[MAX_LEV_FIELDX][MAX_LEV_FIELDY];
extern unsigned long ChangeEvent[MAX_LEV_FIELDX][MAX_LEV_FIELDY];
extern boolean Pushed[MAX_LEV_FIELDX][MAX_LEV_FIELDY];
extern unsigned long Changed[MAX_LEV_FIELDX][MAX_LEV_FIELDY];
extern unsigned long ChangeEvent[MAX_LEV_FIELDX][MAX_LEV_FIELDY];