Chili Con Carnage Cheats on PSP

Invincibility

Create a new Profile and type ERNESTO as your name.

Infinite Ammo

Finish a stage while keeping your combo meter from reaching zero. You'll unlock a "chili" at the end of the stage which will get you infinite ammo on a certain weapon.
It's recommended to get Bronze medals on the stages too, which will increase your health and combo time.

Effect - Code

Infinite AK-47 - chili on "Need a Ride" stage
Infinite Combat Shotgun (Spaz) - chili on "Ay Mama" stage
Infinite Grenade Launcher - chili on "Arena Del Toro" stage
Infinite Heavy Handgun (Python) - chili on "Muc

Skip Level with Gold Rank

During Gameplay, press X, Square, Triangle, Circle, then Select. You'll skip the level and complete it's challenge with a Gold Rank.