Type these codes in during gameplay to use them.

Invincibility OLER
Full health OLPOSTAL
All weapons and ammo OLASH
Unlimited ammo OLWIMPY
Instant reload OLJACKPOT
Adds inventory items OLOPEC
Adds oil OLGUSHER
Unlimited oil OLAIRHEAD
Fly mode OLREDLITE
Freezes enemies OLBOUNCE
Super jump mode OLCDS
Full map OLSCREENING
Show cutscenes OLFPS
Display frames per second OLGPS
Display current coordinates OLTOMBSTONE
Instant death OLZIP
Teleport Levels codes: OLHIDEOUT OLTOWN OLTRAIN OLCANYON OLMILL OLSIMMS OLMINER OLCLIFF OLRANCH.