Type ‘t’, then enter the code, and press enter.

healme        - heal
die           - kill all enemies
warpme        - choose level
lukeyboy      - be luke skywalker!!
Hannyboy      - be han solo!!
leialeialeia  - be leia
chewie        - be chewbacca
iamagod       - uberjedi
diediedie     - all weapons
gimmestuff    - full inventory
gameover      - level jump
trainme       - force level up
boinga        - God mode (type boinga1 for mode on or boinga0 for mode off)
trixie        - full mana
  

Thanks to Revolution reader Dave S!