Instructions
Select "Zombies" from the "Black Ops" main menu.
Select a map from the "Mission Select" screen.
Shoot the zombies as they appear on the map. Zombies appear from the boarded-up windows located in different locations on each map. A zombie can be killed before it tears down the boards and enters the map by shooting it.
Earn points by killing zombies, with additional points being earned by shooting a zombie in the head. Points are spent on doors to open additional parts of the map or on stronger weapons that are found hanging on the walls.
Press and hold "X" in front of an open window to replace the boards, hindering the zombies' ability to enter the map.
Revive a teammate by holding "X" near his collapsed body. If you are playing alone, you cannot be revived and the game ends if you are killed. In multi-player, the game ends when all players are killed. Players are brought back to life automatically at the end of a wave.
Progress to a new wave by killing every zombie in the current wave. Your current wave is listed in the bottom left corner of the screen.