Ultima Underworld - The Stygian Abyss

Cheat Codes:
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Enter one of the following codes during game play to activate the cheat function.

Result                    Code 
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Unlimited strength      - [F10]G  
More light              - [F10]I 
Level skip              - [F10]W 
Stop time and monsters  - [F10]Z  


Unlimited scrolls and potions:
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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.


Tip:
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The spell VAS ORT YLEM can add some magic to your inventory.


Barter Opportunity Exploit:
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When a barter attempt with a non-player character (NPC) reveals a poor
selection of items owned by the NPC, cancel the barter, save the game,
and try again. Apparently, each time the game is saved, items up for 
barter by the NPC will be a slightly different selection (either new 
items, same items with different quality, or different quantity). 
However, this does not affect items that the player has bartered off,
they will remain up for barter in the NPC's inventory regardless.