Pause the game with P then hit Backspace. Now type:

Boufgod mode
Gunhedall guns and 100 ammo
Sablerun fast or walk normally
Badescort bird
Cstrikeairboard
Hocusnext level
Hookerbonus level
Kenexit the program 
Marklose level

Arjan HAHAHA displayed on the screen

Thanks to Revolution readers Jocke Liljeberg, Akshay, Kraig, Adrian “Fruitcake”

Moen Guthe, Neil Poulsen, and James M. McGuire!