A parasite-based survival action game. You tget an animal to eat you, and then you take control of that animal, and try to get a bigger animal to eat that, and so on. The aim of the game is to get to a certain size within a set time limit.

Every animal has realistic tastes, so a carnivore won't eat plants and vice versa. Some smaller animals will try to eat larger (wolves eating moose, etc.), so you have to avoid them. Each level starts off at various sizes and has a different goal size. Gameplay is like a mix of Cubivore and Katamari Damacy.