Enter the mysterious world of Halo, an alien planet shaped like a ring. As mankind's super soldier Master Chief, you must uncover the secrets of Halo and fend off the attacking Covenant. During your missions, you'll battle on foot, in vehicles, inside, and outside with alien and human weaponry. Your objectives include attacking enemy outposts, raiding underground labs for advanced technology, rescuing fallen comrades, and sniping enemy forces. Halo also lets you battle three other players via intense split screen combat or fight cooperatively with a friend through the single-player missions.