Call of Duty: Black Ops

Cheat Codes
Press LT+RT at the main menu until Mason gets up out of the chair. Turn around to face the computer. Type any of the following commands into the computer for the desired cheat effect.

Code - Result:
doa - Zombie Killing Mini-Game
3arc intel - Unlock All Intel
3arc unlock - Unlock Dead Ops Arcade and Presidential Zombie Mode
zork - Play ZORK
dir - List audio files and pictures for use with CAT command
cat <filename>- Open corresponding file
who - List of login names for use with the RLOGIN command (requires passwords)
help - List commands