To unlock the second one you need to beat the game on any difficulty. You unlock the third one like this: when you start the game, it says press start. press start then with the right analog stick look down and press all the triggers buttons. you should break free. then find a computer that lets you press square or X, and you see a keyboard. type cd, press enter. type doa (for dead ops arcade) then press enter. done.
U can also type 3ARC UNLOCK to get five and dead ops arcade
AND---you can get the FOURTH one by buying it off of playstation network or on the Xbox thing (i dont know what the Xbox thing is, i only have a ps3)
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ALL zombie maps have infinite levels with increasing difficulty as the levels go on.
There is no limit to levels on Zombie Mode in Black Ops. It is a survival type game mode and does not end except when you die. There could not be a number of levels because it is infinite with new levels continuing until the game ends when you die.
The Nintendo Wii can only get 3 of the 9 possible zombie maps for Black Ops. see related zombie mode for identification and information on all of the 9 zombie maps
I've been looking around online, and it says that you can't unlock the other 2 levels for the wii, you can only have the one map that is included when you start the game.
zombie mode is in black ops because of public demand. tryarch was to help make black ops and in world war tryarch made nazi zombies so when they made black ops they included it in