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. Your objective is to uncover Halo's horrible secrets and destroy mankind's sworn enemy, the Covenant. Fight the Covenant in dozens of missions as you discover the virulent secrets of Halo. Your goals include attacking enemy outposts, raiding underground labs for advanced technology, rescuing fallen comrades, stealing alien vehicles and weaponry and sniping at enemy forces.