The underwater world is full of danger, let's drive our robot gun shark to defeat all the enemy. You can play by yourself, or play with your friends together. As the difficulty increases, you have to unlock new powerful sharks, upgrade them, get more power. There are some different sharks in the game wait for you, include: bull sharks, goblin sharks, tiger sharks and great hammerhead sharks. Don't miss question mark box in the game, that would make the game get into special mode, make screen upside down to increase difficulty more fun, or may be a reward items to help you restore HP or get higher score, in a special mode, you can get more stars to upgrade your shark. Have fun.