There are 7 size tiers of shark in Hungry Shark World, from (XS) to (!!). Moving up the size tiers means you'll be able to eat bigger things and smash through tougher walls. If you want to explore every part of your favourite levels, you're going to need a bigger shark!

Unlocking some powerful sharks such as prehistoric sharks with coins will require you to collect items in the game, such as ancient shark's teeth and fossils. You can also purchase your shark early with gems when the 'Get Now' icon appears.

You can find more information on what each shark can do, eat and break on the Shark Select Screen by tapping on the '?' icon next to the shark name.