If you don't sell your soul an annoying banner will constantly remind you that you should've. The wors thing is it blocks certain buttons too, so you can't click them. After 1-2 levels the game just crashes or auto quits and despite the fact that there are always at least one ad showing on the screen, they give you an ad after almost every level. Even if you clicked the no thanks button for the optional ad fueled miney booster.