During gameplay type gabbagabbahey listed below to enable cheats or none of the others will work.
Enabling cheat mode will reset your score to 0 unless a new game is started and of course they can't be used for multiplayer. Saved games will be tagged with a cheat status as well.
Descent PC Cheats
CHEAT CODE RESULT
GABBAGABBAHEY Enable cheats!
RACERX God mode On/Off
BIGRED Super wowie zowie weapons
MITZI Gives you all keys
FLASH Quick exit
TWILIGHT Recharges shields to 100%
GUILE Cloaking device On
BRUIN Another Life
FARMERJOE Warps to level of your choice
BUGGIN Turbo Mode (registered only)
LUNACY Robots move fast, fire seldom (registered only)
SCOURGE WowieZowie Weapons (all Shareware Version weapons)
PORGYS Rapidfire weapons v1.4 only
POBOYS Starts reactor self-destruct sequence v1.4 only
AHIMSA Robots stop firing v1.4 only
ASTRAL Ghostly mode v1.4 only
* Updated game trainers and cheats daily
* Get notified when new cheats are added
* Request which games get new trainers
* Priority support with any problem