Use the following codes to activate the corresponding cheat function:
Invincibility: iddqd All weapons + keys + ammo + 200% armor: idkfa
Reset ammunition: idfa
Berserker strength: idbeholds
Temporary invincibility: idbeholdv
Temporary invisibility: idbeholdi
Full automap: idbeholda
Anti-radiation suit: idbeholdr
Light amplification visor: idbeholdl
Walk through walls: idclip
Chainsaw: idchoppers
Level select: idclev[level number 01-32]