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.
Three doors opens and closes randomly. Behind each door you will see different targets. Shoot the bad guy before the door closes. Just make sure that you don't hit the nice lady by misstake.