no , but Call of Duty modern warfare reflex (cod4) has
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In Call of Duty: Black Ops, to go on multiplayer you have to go to multiplayer on the menu that says: CAMPAIGN MULTIPLAYER ZOMBIES OPTIONS
no
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there is no co-op in campain but if u mean multiplayer then multiplayer psycho!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
they have to get the kills first!