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Co-oping it.
I think that Halo ups the difficulty if you're on co-op. Like, if you're playing on Legendary solo, the difficulty is a fraction or two lower than if you're playing Co-op on Legendary. It always feels to me like Legendary is tougher Co-op than on solo, and if thats the case, than the difficulty level might not be a problem. I think the main problem with having 4 player co-op is that the story missions might not have the space or equipment to sustain the fighting preferences of more than two people. Of course, maybe I'm wrong, but from what I can tell from previous co-op missions on Halos 1 and 2, it would be tough to have more than to players on the mission.