After progressing quite far I'll say this. The game is trash. They intentionally put levels in to do everything they can to get you to pay money and I don't mean hard levels, I mean impossible. Numerous times I have done amazing on a level but the map will refuse to drop the necessary items that I need to collect to beat the level. I literally mean impossible without using resources. EDIT: 1 year later I reinstalled it and regardless of the fact that I got a reply this issue still persists.