This stupid money hungry game. You're only supposed to watch one ad for a free revive but it makes you watch three otherwise it won't work. And the process of getting coins to buy sharks is EXTREMELY slow and long.To make people use real money. I literally didn't buy any Large sharks so I could afford an Extra Large shark but guess what? Still didn't have enough. And I was getting high scores and a lot of coins. It's really only a good game to play for a short while, it gets kind of boring fast.