That campaign though. I've never felt the incentive to do the campaign for cod as it's never the best really, and once you do it or of you do it your most likely never going to touch it again.
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That's what I liked about this one so far. The 4 player coop campaign, and once you finish it you get nightmares mode. Which is the campaign with an alternate story and reality where the zombie virus got free. It changes all of the non-mechanical enemies into zombies, and they do use guns.