Ads rarely work. Red arrow shows when there's nothing there to do. No option to see earnings/sec. When selling cards, click cancel - selects card under it instead. Can't sell cards from that screen where you can see levels etc, goes to new screen where you can't see that to judge how many you should sell. Can't play offline. Regularly crashes saying the data is out of sync. No tap feature to allow you to earn cash faster while in game. Cash grab.