Cheat mode:

Press T, then enter one of the following codes…

mpgod		God mode                     	 
mpkfa		Full ammo, armor, and health 	  
mphealth	Full health                  	  
mpammo		Full ammo                   	 
mparmor		Full armor
mptears		Unlimited ammo 
mpanime		Anime-style explosions               	  
mpclip		Toggle clipping              	  
mppos		Toggle coordinates    	  
mpcamera	Adjust camera                	  
mplightscape	Adjust lighting              	
mpmech		Use different mech
world(XXXX)	Level skip, where (XXXX) is one of the following names:

01_Ambush
02_Quarters
03_MCA_Dock
04_Shuttlebay
05_LZ_Minotaur
06_Entrance
07_Avernus1
08_Airshafts
09_Comm1
10_Comm2
12_Comm3
13_New_MCA
14_Maritropa1
15_Depot
16_Slums
17_Lost_Cat
18_Slums
19_Rendezvous
20_Maritropa1
21_Maritropa2
22_Tram
24_CMC_Sec1
25_CMC_Sec2
26_Tram
27_New_MCA
28_Airshipdock
29_Airship
30_Research
31_Avernus1
32_Museum
33_Quarters
34_Energy_Plant
34_Spires
35_Command
35_Fortress
36_Elevator
36_Kato_Center
37_Gabriel  

Thanks to Revolution readers Jilted, Codeace, Ryan Duke, Sanjuro, Jonathan

Dubose, Max, Colin Coffman, Tim Ecklin, and Ryan Berndt!