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If Modern Warfare 2 to had aliens/zombies in it which would you think would be more challenging LOL
Zombie: Just run and slap you
Aliens: Aliens could have rays guun and like the the shit out of you
But then think of it imagine that they would have every single weapon from CoD4,W@W,MW2 + gernades bombs and everything I don't no if that could still be challenging or not