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i found this video and couldnt find this any where on here so i thought id post it
[ame=https://www.youtube.com/watch?v=V6PlyR4DSUE&feature=feedu]YouTube - Call of Duty Black Ops Zombies Glitch Not Patched[/ame]
If you dont press any of the defcon switches, and kill the scientist without having him take away a single gun he will drop a fire sale for the pack-a-punch machine making it only cost 1000 and the doors will not open and it will say 115 Access denied
Hmm..but now crawlers bleed out and a new zombie comes. and when ever the people die they sometimes spawn upstairs....unless maybe all three people need to die for it to work?
Oh and you could also do the three crawlers building a window to keep the zombies at bay, there's only two windows so it should be easy enough.