when you load up COD black ops and you have the menu screen. If you look down then press L2 and R2 a few times he'll break free of the chair and be able to walk about the room.
There is a computer screen in one of the corners. Go to it and enter the codes to get the following things unlocked.
3ARC INTEL-unlock all intel, WARNING:will disable the achievement for finding all intel
3ARC UNLOCK-unlock all missions and the zombie maps
DOA-unlock dead ops arcade and an achievement
ZORK-achievement
There is a computer screen in one of the corners. Go to it and enter the codes to get the following things unlocked.
3ARC INTEL-unlock all intel, WARNING:will disable the achievement for finding all intel
3ARC UNLOCK-unlock all missions and the zombie maps
DOA-unlock dead ops arcade and an achievement
ZORK-achievement