Start the game at the DOS prompt with these codes:
 /cryogod        God mode
 /cryocred       99 credits
 /cryosm         Level select
 /cryoeasy       No tourists easy mode
 /cryoeasy2      No mutants easy mode
 /cryomad        Flamethrower
 /cryood         OD car
 /cryosz         SZ surf
 /cryostevietour Mini car
 /cryoblur       Blurry graphics