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I have been goin to alot of different topics lately and everyone is asking if there is system link or co-op on single player or split screen. Everyone who has asked these questions go to teamxbox.com and look up halo 2 it has all the info right there
If it hasn't been posted on Bungie by the mods, of Bungie staff, then DON'T believe it!!!!You can't trust that site as it's all speculation. The game isn't finished yet and is subject to change.