That's one of the only player instructions in this flash game, Sydney Shark. What more do you need?
You are Sydney, a great white shark on the loose in... Sydney, Australia, and you've got a finite amount of coastline to roam, pulling down anything and everything you can cram into your toothy maw.
That includes humans and whales, yes, but also ocean liners, horse floats and large QANTAS passenger aircraft.
You can play it at the link below.