Type these codes during the game:
olash: unlimited ammo
olpostal: all weapons and full ammo
oljackpot: adds inventory
olredlite: freezes enemies
olcds: full map
olairhead: fly mode (use jump/crouch keys to fly up/down)
olzip: teleport
olfps: shows frame rate
olgps: displays coordinates
Level Codes
olhideout
oltown
oltrain
olcanyon
olmills
olsimms
olminer
olcliff
olranch