Hold [Left Shift] and press [Keypad Minus]
at the indicated screen. Release the keys, then type one of the
following codes to activate the corresponding cheat function.

Screen Code
God mode Any iwillbetheone
Saves game Game play
savegame
End current mission Game play
endmission
All missions unlocked Main menu
campaign
Show elevations on map Main menu
topography
Trainer: +1 v1.06 by CyberMan
Trainer: +1 v1.07 by CyberMan