dont know how many of you know about this but theres an extra game on black ops if you press the trigger buttons while sitting on the main screen you can stand up and walk to another computer and play black ops arcade

https://www.youtube.com/watch?v=n5UUotdxCNI&feature=fvst

if you enter "doa" to play the game or if you want to unlock all the zombie levels "3arc unlock"

Hmmmm, interesting....

Interesting. Will have to try this tonight.

Follow up question. How do you unlock the third zombie map?
I have the "The Five" unlocked but there is still one grayed out.

the third level is the arcade game but you can play coop i entered both and it unlocked for me?