To enter these, simply scroll down to "Extra Content" and pull the right trigger, or push the R1 button. A keypad will appear.
Game Cheats
Take Less Damage: 548975
Use less PSI power: 456456
AllPowers: 537893
Unlimited Ammo: 978945
No Head: 987978
Playing Modes
Arcade Mode: 05051979
Coop Mode: 07041979
Survival Mode: 7734206
Dark Mode: 465486
Nick Models
Training Nick: 564689
Urban Nick: 484646
Wasteland Nick: 975466
Stealth Nick: 456498
Sara Models
Sara: 135488
Psi Sara: 468799
Suicide Sara: 678999
Barett Models
Barrett: 497878
Training Barret1: 196001
Training Barret2: 196002
Training Barret3: 196003
Training Barret4: 196004
Training Barret5: 196005
Training Barret6: 196006
Wei Lu Models
Wei LuL: 231324
Dragon Wei Lu: 978789
Tranquility WeiLu: 654654
General Models
General: 459797
Clown General: 431644
Other Models
Marlena: 489788
Tonya: 136876
Fetish Pyro: 231644
Bikini Pyro: 135454
Saranae: 65496873
Jov: 468987
MP1: 321646
MP2: 698799
MP3: 654659
Jack: 698798
Soldier: 365498
Burned Soldier: 454566
Labcoat: 998789
Dock Worker: 364654
Komiko: 978798
Scorpion: 546546
Extra Missions
Pitfall: 05120926
PanicRoom: 76635766
Up And Over: 020615
Stop Lights: 945678
Gasoline: 9442662
Bottomless Pit: 154897
TK Alley: 090702
Gear Gauntlet: 154684
Tip The Buddha: 428584
Psi Pool: 565485
Aura Pool: 659785
Bouncy Bouncy: 568789
Gnomotron: 456878