If you have a PS3, X-Box 360, or Wii, you have to have an internet connection. PS3 requires you to make an internet connection and create a PSN account, then you can play online. X-Box 360 requires an internet connection, then you have to sign up for X-Box Live for online play. And as for Wii, you have to make an internet connection, and that's it.
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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 , but call of duty modern warfare reflex (cod4) has
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Up to 4 players can play simultaneously in call of duty black ops multiplayer.
there is no co-op in campain but if u mean multiplayer then multiplayer psycho!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!