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If you experience discomfort while playing this game, take a break and consult the healthy gaming guide in your Xbox 360 console manual (also available online at http://www.xbox.com/). Single Player, Xbox LIVE Multiplayer 2-8, Local Multiplayer 2-4, HD (High Definition). Purchase now to unlock the full game, with all the classic Marathon gameplay and shiny new enhanced high-definition graphics! Feeling tough? Take on the universe alone in Single-Player mode. Feeling friendly? Team up with others to fight the Pfhor in Cooperative mode. Spoiling for a fight? Challenge the world to Deathmatch, King of the Hill, Tag, or the ever-popular Kill the Man with the Ball! There are no refunds for this item. For more information, see www.xbox.com/Live/accounts.