If you shoot ALL of the heads off the two dozen or so mannequins that spawn in random positions every round in the Multiplayer map 'Nuketown' the Rolling Stones classic 'Sympathy for the Devil' will play for the rest of the match.
The following procedure involves editing a game file so it is advised that you create a backup copy of the file before proceeding. Locate the 'config.cfg' file in the 'players' directory in the game folder and use a text editor to change the value of the seta monkeytoy '1' line to seta monkeytoy '0'. Save the file and change its attributes to read-only. Then press the '~' (tilde) key at 'Main' menu to display the console window and enter one of the following case sensitive codes to start at the corresponding map.
Kino Der Toten: /devmap zombie_theater
Pentagon: /devmap zombie_pentagon
When the map has loaded press the '~' (tilde) key again to display the console window and enter one of the following codes (without the quotes) to activate the corresponding effect.
God Mode: Type '/god'
Juggernaut: Type '/demigod'
Ammunition: Type '/give ammo'
No Clipping Mode: Type '/noclip'
Flight Mode: Type '/ufo'
Extra Weapons: Type '/give all'
Set Player Speed: Type '/g_speed '
Unlimited Ammunition: Type '/player_sustainammo 1'
Login to the Dreamland Server (Usernames and Passwords)
Access the Central Intelligence Agency Data System and enter the case sensitive command 'rlogin' (without the quotes). When prompted to login with an account with MJ12 access enter the following usernames and passwords to continue.
Login as Robert Oppen: Username: roppen Password: trinity
Login as Vannevar Bush: Username: vbush Password: majestic1
Access the Central Intelligence Agency Data System and type the case sensitive command 'login' (without the quotes). You will then be prompted to login with an account. Enter the following usernames and passwords. You can then access their documents with the 'dir' command or email with the 'mail' command.
Bruce Harris Username: bharris Password: goskins
D. King Username: dking mfk
Adrienne Smith Username: asmith Password: roxy
Vannevar Bush Username: vbush Password: manhattan
Frank Woods Username: fwoods Password: philly
Grigori 'Greg' Weaver Username: gweaver Password: gedeon
J. Turner Username: Jturner Password: condor75
Jason Hudson Username: jhudson Password: bryant1950
John McCone Username: jmccone Password: berkley22
Joseph Bowman Username: jbowman Password: uwd
John F. Kennedy Username: jfkennedy Password: lancer
Lyndon B. Johnson Username: lbjohnson Password: ladybird
Richard Nixon Username: rnixon Password: checkers
Richard Helms Username: rhelms Password: lerosey
Richard Kain Username: rkain Password: sunwu
Ryan Jackson Username: rjackson Password: saintbridget
To be able to access early unlockables and hidden features in the game escape from the chair at the 'Title' screen and move around to the area behind the chair to find an old computer terminal that you can type one of the following case sensitive codes (without the quotes) to enable the corresponding effect.
Unlock ALL Missions, 'Five' Zombie Mode Mission, Dead Ops Arcade Game, Zork Game: Enter '3arc Unlock' as a code.
Unlock ALL Intel: Enter '3arc Intel' as a code.
Display ALL Commands: Enter 'help' as a code. This displays a list of system commands in the terminal and Pentagon user e-mail access.
Unlock Dead Ops Arcade Game: Enter 'DOA' as a code. This feature is a zombie killing mini-game similar to Smash TV.