Litterally got almost all my progress wiped after i uninstaled and reinstalled the app because i was having issues with the game freezing up when it is supposed to show an ad (i uninstalled and reinstalled thinking that my progress would save because i did this with world and it saved) AND IT SAYS THAT I HAVE A BIT OF PROGRESS ON STERIO MADNESS AND YET I HAVE COMPLETED AS FAR AS BASE AFTER BASE Edit: fixed the problem somehow still have to redo levels doe. 4 stars