How do I unlock all the levels of black ops zombie maps?

I have tired the cheat code 3arc unlock and it didn't workHow do I unlock all the levels of black ops zombie maps?
if you want the maps from world at war you had to buy the hardened or prestige edition. 3arc unlock will give you "Five" and Dead Ops Arcade. Kino der Toten is unlocked by default. Those are all the maps for Black Ops. They may release the others later for DLC.
Kino Der Toten=Default (already have)

Five=Beat the campaign

Dead Ops Arcade=Type in DOA on computer

Shi No Numa, Der Reise, Nacht Der Untoten=Buy the Hardened Edition or Prestige Edition of Call of Duty: Black OpsHow do I unlock all the levels of black ops zombie maps?
Beat the game to unlock all the zombie maps and join the website I put as my source for more tips if you have an xbox 360.
you get five by completing the story and try typing DOA in the little computer see if that worksHow do I unlock all the levels of black ops zombie maps?
Just beat Campaign mode

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