![]() Five large campaigns from the Cooperative, Versus and Survival modes.New storyline with new characters and new dialogs. ![]() Collaborative playability developed by the creators of games of the likes of Half-Life, Portal, Counter-Strike, and Team Fortress.Play on the side of the zombies and find out what it's like to be a baddie.New game modes that make the most of the first installment's cooperative system. ![]()
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