World at War, when first release, unlocked Nazi Zombies after completing the campaign. But after an update, it was made available any time, even without playing the campaign at all. It only has one map though, with three others available separately.
you beat the game
you cant get zombie mode until you beat the game on solo mode
You have to beat nazi zombie mode.but if you use glitches the game goes for ever.if you dont the game just goes to level 100.
There currently is: Call of Duty World at War.
ya
Yes and No.If you update the game you automatically get a Nazi Zombies option in the lobby screen.
Finish the story mode and then after it you will start playing immediately. When you lose you can go back to it from the main menu.
Dont die
You have two choices with this you can either beat the whole game or buy the map packs. The Zombie mode is part of World at War and Black Ops call of Duty games and additional maps are on the DLCs to those games
it never ends
yes there is a zombie-survival-bonus-map You have to complete the game first tho
1/30 chance in World At War.