Ultima Underworld: The Stygian Abyss

Ultima Underworld: The Stygian Abyss cheat codes: 
Enter one of the following codes during game
play to activate the cheat function.
[F10]+[G] - Unlimited strength
[F10]+[I] - More light
[F10]+[W] - Level skip
[F10]+[Z] - Stop time and monsters

Unlimited scrolls and potions:
Use a fireball spell on a potion or scroll. Collect the remnants
of the destroyed item and use it. The remnants will have the same
effect as the original potion or scroll and may be used an
unlimited amount of time.