Ultima Underworld 2 Cheats (PC)

During the game push F10 KEY where KEY is:
  G - Unlimited strength
  I - For more light
  W - Level jump
  Z - Stop time and monsters

  Delete, rename or move the LIGHTS.DAT file in the DATA folder to make all the dark
places become bright.

  Repeatedly throw a potion or scroll against a wall (or just send a Fireball at it if
you're impatient) until the item turns in 
  a pile of debris. It would seem to be a wasted, but when you pick it up, you'll find
that you can use it infinitely. Get one of Heal, Fly, Restore Mana, Light, and Smite Foe,
and you're nearly invincible.