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complete the campaign then you will unlock it
Beat theCampaign
by beating the game
by beating the game
You can't simpley unlock them, you have to buy them.
No, but when you beat the campaign on World at War, you do unlock zombies mode. You also unlock the map "Five" on Black Ops for completing the campaign, unless you use the terminal in the main menu room.
You have to do levels in the World Tour
Yes. You unlock the mode once you have completed all the missions.
Complete Solo Campaign on any Difficultly
yes, you just have to beat the game.
One of the last levels they come out.
If you mean for the Nintendo DS they had no Zombie Maps