In game set gamespeed to pause and press the button
(its opening a screen were you can save your game and load one)
In the screen that open type:
funexplore - You see the hole map.
FUNCOLORS - Toggle the display colors between grey, brownish, light grey and normal
FUNLARRY - Play all game sounds very fast, enter again to return to normal
FUNOUTTAKE - Plays the outtake.mp3 from the CD
Unlock missions by typing one of the following codes at the campaign selection screen. You will hear a sound if the code was entered correctly and also the level will appear on the map.