Duke Nukem: Manhattan Project cheats and cheat codes for PC

Cheat mode:
While playing the game, hit ~ (tilde) to bring up the console. 
Then, type any of the following cheat codes:

Effect - Code 
Switch camera to normal - Type "camera player" as a code.  
Spawn extra babe - Type "give bomb" as a code.  
Show map information - Type "toggle g_map_info" as a code.  
Show Debug mode - Type "toggle g_debug" as a code.  
Matrix-style pause - Type "pause" as a code.  
Mark secret found - Type "give secret" as a code.  
Kill yourself - Type "kill" as a code. 
Jet pack - Type "give jetpack" as a code.  
Get All keys - Type "give keys" as a code.  
Get 100 Ego - Type "give health" as a code.  
Get 10 nukes - Type "give nuke" as a code.  
Full ammunition - Type "give ammo" as a code.  
Force field - Type "give forcefield" as a code.  
Display game statistics - Type "toggle r_stats" as a code.  
Camera can explore level - Type "camera camera" as a code.  
Bonus life - Type "give life" as a code.  
All weapons and items available - Type "give all" as a code.  
Activate God mode - Type "toggle g_p_god" as a code.  
Unknown - Type "toggle r_timings" as a code.  

Cheat mode (alternate):
While playing the game, hit ~ (tilde) to bring up the console. 
Then, type exec cheats.cfg and hit [Enter] to activate cheat mode. 
After that, hit any of the following keys while playing the game:

Effect - Key 
Matrix-style pause - Press P 
Kill yourself - Press K 
Get Jet pack - Press J 
Force field - Press F 
Bonus life - Press L 
All weapons available - Press H 
All weapons and items available - Press G 
Activate God mode - Press I