Can you get all the zombie maps in black ops?

Black Ops comes with Kino der Toten, Five and Dead Ops Arcade.

Kino is availalble straight away but to get the other 2 simply get out of the chair on the main menu (Keep hitting R2/L2, RT/LT, Space depending on platform) and go to the computer and type in 3arc unlock.

To get the World at War maps (Nacht der Untoten, Shi No Numa, Der Riese, Verrukt) you will need Hardened Edition.

To get Ascension you will need the First Strike DLC available on Xbox Live Marketplace at time of writing and will be on PC and PS3 from March.