You unlock it by completing all shark hunt levels with at least a minute remaining, then the shark will appear on the title screen to click!
how do you do the shark hunt i only have the cruise button and a mermaid with a halo?
Eat a shark, try using the abilities to help you. Fire and squid clones shrink them, eel and puffer lets you eat them when slightly smaller
the minute requirment is too strict, as it becomes rng to eat the sharks that quickly. not only that, I can hit the size I need to be but the shark refuses to swim from right to left