It's fun at first but eventually it's going to make you want to Uninstall it or smash your phone. Not bc you don't like a challenge but bc you see how RIGGED this game is! They want you to PAY for more birds, that is their ultimate goal. So You will eventually spend DAYS on one world even though you know you can beat it, they will not LET YOU. And who has time for that? They only want money in the end, save yourself the frustration unless you enjoy giving money for a bunch of Birds?!