Cheat Codes:
------------
At the main menu, use the Right Analog-stick to look down at your hands
and see you are locked up. Repeatedly press LT + RT to escape from the
chair (unlocks the "Just Ask Me Nicely" secret achievement). After
breaking free, move around to the area behind your chair to find an old
computer terminal you can use to access the Central Intelligence Agency
Data System. Type one of the following codes to access early unlockables
and hidden features in the game. *Note:* You can also plug a USB
keyboard into your Xbox 360 to enter the codes and play the Zork
text-based adventure game.

-=Mission select=-
Enter "3ARC UNLOCK" as a code to unlock the "Five" Zombies mode map, Dead
Ops Arcade game, Zork: The Great Underground Empire text-based adventure
game, and all missions.

-=All Intel=-
Enter "3ARC INTEL" as a code to unlock all Intel.

-=Alicia game=-
Enter "ALICIA" as a code to unlock the Alicia virtual therapist
game.

-=Dead Ops Arcade game=-
Enter "DOA" as a code to unlock the Dead Ops Arcade game, which
is a zombie killing mini-game similar to Smash TV.

-=Zork game=-
Enter "ZORK" or "HELLO SAILOR" as a code to unlock the Zork:
The Great Underground Empire text-based adventure game.

-=Display all commands=-
Enter "HELP" as a code to display a list of system commands in
the terminal and Pentagon user e-mail access.

-=Open corresponding file=-
Enter "CAT [filename]" or "PRINT [filename]" as a code to open
the corresponding file.

-=List audio files and pictures=-
Enter "DIR" as a code to display a list of audio files and
pictures for use with "CAT" command.

-=List of login names=-
Enter "WHO" as a code to display a list of login names for use
with the "RLOGIN" command (requires passwords).

-=Login=-
Enter "LOGIN" as a code to login with a corresponding username
and password.

-=Open mail folder for current user=-
Enter "MAIL" as a code to open the mail folder for the current user.

-=Display contents of current directory=-
Enter "DIR" or "LS" as a code to display the contents of the
current directory.

-=Encode a string using the CIA's cypher=-
Enter "ENCODE" as a code to encode a string using the CIA's cypher.

-=Decode a string using the CIA's cypher=-
Enter "DECODE" as a code to decode a string using the CIA's cypher.

-=Display "Fee Fie Foe Foo!"=-
Enter "FOOBAR" as a code to display "Fee Fie Foe Foo!". 

  منبع:www.SamiTM1.LXB.IR