The game is ok, but if you play for more than a few days you become heavily reliant on adverts if you don't pay for the "VIP Club", and they have some really buggy ads; some open to a black screen, then you have to tap the screen to get your "back" button to appear, but that then opens the Google Store app, and when you click "back" to try to return to the game, the buttons disappear again so you get stuck between the broken ad and the app store. The only option is to reload the game.