An alien has landed and it is your job to evolve it, one animal at a time. The gameplay is easy, because the game is controlled via the mouse. However, the puzzles can be quite difficult. Each stage, you will be faced with an animal. Your objective is to devour the animal and take on all of its attributes (not all, but enough of them). Use the environment to find a way to distract the animal long enough to sneak around and eat them. Each time you do, the alien will grow and change. Be careful though, because if you get caught, you will be killed almost instantaneously.