short Back[MAX_LEV_FIELDX][MAX_LEV_FIELDY];
boolean Stop[MAX_LEV_FIELDX][MAX_LEV_FIELDY];
boolean Pushed[MAX_LEV_FIELDX][MAX_LEV_FIELDY];
-boolean Changed[MAX_LEV_FIELDX][MAX_LEV_FIELDY];
+unsigned long Changed[MAX_LEV_FIELDX][MAX_LEV_FIELDY];
+unsigned long ChangeEvent[MAX_LEV_FIELDX][MAX_LEV_FIELDY];
short JustStopped[MAX_LEV_FIELDX][MAX_LEV_FIELDY];
short AmoebaNr[MAX_LEV_FIELDX][MAX_LEV_FIELDY];
short AmoebaCnt[MAX_NUM_AMOEBA];