Travel through 10 different levels as you try to find a way into defeating the Covenant. Halo gives you a choice of using a lot of weapons including a rifle, pistol, rocket launcher, and even using the Covenant weapons. You may only carry up to 2 weapons that are different and up to eight grenades (four being fragment and four being plasma grenades). Rather than going through the entire levels on foot, you can also use vehicles to get around faster. Some of the Marine vehicles that are included are a warthog and a tank. Covenant vehicles include the Ghost and Banshee.
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This game is also known as Halo: Combat Evolved in North America / Japan / Europe / Australia.