You have, somewhat limited, control of a bug (a carpenter ant) that constantly flies up a river in a swaying fashion, you can only speed the bug up or down on its way. Try to navigate between the rocks without hitting them. On some of the rocks, there are frogs that would love to have you for dinner so be extra careful when you pass them.

This is a very fun and addictive game to play. It can be hard at times but keep going and you'll soon have a high score.