The Aqualines screen resembles an aquarium, containing coral, and various sea creatures. The creatures move from the top of the screen (aquarium) to the bottom along the branches of coral. You can alter the coral's formation to steer the creatures in a particular direction. Should some creatures settle at the bottom, and form a row of 3 or more identical, this row will disappear and increase your score.

Your aim is to line up a row of 3 or more identical creatures. The longer the row, the higher the score, so to rack em up, plan carefully to maximise your score :).