Black ops small issue...

Martin 71

Distinguished
Mar 30, 2010
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Hey, I just got black ops, and I beat the sp campaign... and it let me play zombies in the pentagon for a little while. Then I decided to get off, so I quit out and left the game. When I go back and try to play zombies from the main menu it tells me that it "cannot connect to black ops servers." I just want to play offline... Is there any way I can do that? or do I have to be in a match w/ other people? If I can just play alone, then why must it connect to the server? This is really bugging me.