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I dont know if there is a topic already on this but I mean CO-OP online wouold be the best for Halo3. I wich they had it for Halo2 because More people would of been playin it for longer if there was CO-OP Online
Co-Op via Xbox Live would be a hot feature, considering that it was supposed to be in Halo 2, but I don't think they had enough time to add it or finish adding it, they didn't put it in. I hope they put it for H3.