Your aim is to guide tadpole to his home and avoid all obstacles on the way. Hold LEFT MOUSE BUTTON to swim up, release the button to swim down. Avoid hitting Rocks, Algae and Waterbugs. Be sure to collect those bubbles, they will save you life many times.
Collect coins, switch colours, avoid lightning and unlock those secret levels for a truly impressive score. There's a massive amount of gameplay to be had here so rack 'em up and get going.