Cheat mode:

Press T, then enter one of the following codes…

mpgodGod mode                      
mpkfaFull ammo, armor, and health   
mphealthFull health                    
mpammoFull ammo                    
mparmorFull armor
mptearsUnlimited ammo 
mpanimeAnime-style explosions                 
mpclipToggle clipping                
mpposToggle coordinates      
mpcameraAdjust camera                  
mplightscapeAdjust lighting              
mpmechUse 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!