The game is actually pretty fun. Cool mechanics, decent reward system. You need to watch a fair number of ads but you can play completely for free and still remain competitive. The new co-op mode as of the last update is terrible. The old one was infinitely better. Being limited with keys is restrictive and ruins one of the best things this game had, a co-operative mode you could spend hours enjoying. Unless there is a new change that improves it I don't think I can recommend this game.