PCCheats
Duke Nukem: Manhattan Project

Walkthroughs and Guides
Outside link to all the information you'll need on this game, and more!
Courtesy of: Gamefaqs.com

CHEATS

HOW TO ENABLE THE CHEATS
Press the ~ key to enable the cheat console, then type in the password below (exactly as written):
exec cheats.cfg
Now press the Enter key and the cheat mode will be enabled.
During play you can now type one of the letters below to enable the the Effect you require..
You can press the letter again to turn the effect off..

Letter .... Effect
I .... Invincible
L .... Extra Life
G .... Everything except jetpack and forcefield
H .... All ammo
J .... Jetpack
F .... Forcefield
P .... Matrix-Style Pause
K .... Seld-destruct

Submitted by: Joolz P