50 levels
10 zombies are the most you can have in Zombie Cafe.
Their are three new nazi zombie maps that you can buy from the playstation store for 10 bucks and the original that you get at the end of the game.
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.
15 levels if you finish them you get a zombie map
In the game Plant Vs. Zombies, there are many zombie shooter "plants." There is no activation code required to use these plants. You need to beat levels in order to acquire more plants.
ALL zombie maps have infinite levels with increasing difficulty as the levels go on.
unlimited
There is two games with zombie mode. Call of Duty Black Ops and Call of Duty World at War. There are many other games that have zombies in them as characters. Zombie Mode is a survival type game mode that can not be won and you continue getting new harder levels until the zombies kill you.
There are an infinite number of levels. The game does not ever stop providing the next level when you have managed to kill all the zombies at the current level. Some of the level counters are only two positions, but that does not mean the levels stop at 99. It is called a survival mode and is not designed for someone to be able to beat the game. I am surprised you don't already understand that you are not able to win in zombie mode.
There is only one that comes with the game and then another that you need to download. That one is free. But i guess it kinda varies at times.
There are infinite number of levels because it is a survival format game for Zombies Mode and you continue to get a new levels until you do not survive. You do not win a survival format game and only last as long as you can. The are a number of different Zombie maps including 8 from purchasing the 4 DLCs for the game and 5 are included with the last DLC Rezurrection because it also provides for a download of the 4 WAW maps reworked for Black Ops.
It can be assumed that there are 18 levels on that game..