G-Nome
7th Level
Once again, we've printed cheats for this in the past, but we've never seen these ones before. On the mission computer press Ctrl and F1 together. Now enter one or more of the following case sensitive codes. Correct codes are confirmed with a beep. 
Redtop Trod	Access all missions on the mission menu
Mother Mourn Us	Changes mountains on missions 1-5 to Mt Rushmore with programmers' faces
Chaste Coed	View end game sequence
O'Sarge	Gives Sergeant in training missions an Irish accent
Swiss Throat	Changes citadel building into 7th Level headquarters
A Mere Fart	Fart
A Scramble On	Take screenshots by pressing Shift, Ctrl, and right mouse click
Range Goes Gory	Access all levels and other goodies
Dunk It Here	Sound session out-takes
Horny Elk Leer	Activates all targets on radar key
Half Libel	Activates teleport key
Had A Nude On	Activates invincibility key
Brass Clue	Activates infinite ammo key
Rotted Drop	Activates destroy target
Oh No! Less Japan	Activates ion strike key
In-game cheats:
Ctrl+I	Invincibility
Ctrl+P	All targets on radar
Ctrl+X	Ion strike
Ctrl+Z	Ammo refills
Ctrl+F	Destroy current target
Ctrl+B	Teleport behind target