This was my favorite mobile game after downloading it. However, they did a massive update recently, and Royally screwed up the game play. Co-op was my favorite mode, but the new Co-op took away the unlimited gameplay, and it's much less fun now. Also, it is clearly 'pay-to-win' now, whereas it used to just take extra time to advance if you can't shell out cash to buy stuff. I'm going to give this game a day or two longer, but I think I'm done.