The game takes place in space, inside a giant station with a domed ceiling protecting a closed ecosystem. The main objective is to open all the rooms, by ordering a Norn to carry a key to unlock a door or passage. Deeper levels have aggressive enemies and poisonous plants that have to be avoided by the Norns. There are blue stars scattered throughout the scenery, and the creatures can be trained to fetch and store them inside a machine, generating a new key after twenty-five stars. Norns can breed and lay eggs, producing offspring that takes some minutes to reach maturity.