Ultima 6: The False Prophet

Cheat mode:
Talk to Iolo, say "spam" then press [Enter], "spam" then press [Enter], "spam" then press [Enter], and "humbug" then press [Enter]. The cheat menu will be displayed. The cheat options are:
Information in this section was contributed by dandkfl.

Get Items (allows you to get any item)
Set Flags
View NPCs (allows you view anything about an NPC)
Edit Party (allows you to add/removes player from party)
Edit Player (allows you add/subtract Karma)

Get drunk for less:
If your character drinks enough in the game he will become drunk. Here are the locations of all the pubs and how much it costs to buy some drinks at each one.

Britain
Wine: 6 coins
Ale: 3 coins
Mead: 4 coins

Paws
Wine: 5 coins
Ale: 2 coins (free if you mention duck to Dr. Cat)
Mead: 3 coins

Trinsic
Wine: 5 coins
Ale: 5 coins
Mead: 2 coins

Jhelom
Wine: 6 coins
Ale: 3 coins
Mead: 4 coins

Yew
Wine: 6 coins
Ale: 3 coins
Mead: 4 coins

Moonglow
Wine: 6 coins
Ale: 7 coins
Mead: 5 coins

New Magincia
Wine: 4 coins
Ale: 2 coins
Mead: 3 coins

Buccanneer's Den
Wine: 4 coins
Ale: 3 coins
Mead: 5 coins

Serpent's Hold
Wine: 4 coins
Ale: 4 coins
Mead: 4 coins

Sherry:
Sherry is a mouse that can join your party as a character. To find her, enter the kitchen in Lord British's castle in the east wing. Get the cheese, then enter the east wing room with the potions and crystal ball. Locate the mouse, and talk to it. Say "SHERRY" and she will ask for cheese. Answer "Y", then "Y" again. Say "JOIN" and she will become part of your party. She can be used to collect items that are unreachable by the other members of your party due to her small size (for example, the Rune of Valor).