Not sure about the single player, but you can play co-op zombies right away.
#3dwragon90Posted 6/10/2011 8:38:40 PM
On an un-patched retail install, I had to finish the single player campaign (any difficulty) to unlock Nazi Zombies. I haven't played co-op yet though so I can't comment on that and I only recently patched to the latest version (1.7).
#4liamgrovePosted 6/21/2011 1:44:00 AM
my downloaded maps have just gone and i can't play online black ops or world at war
#5PiTPenguins2787Posted 7/19/2011 5:58:21 PM
if you have a pirated version zombies is already installed with all the maps.
#6GenFrangoPosted 7/19/2011 8:19:35 PM
lol penguin --- Watch out fer the bigfoot hunters! They're EVERYWHERE!!