Ultima VII: The Black Gate/Secrets

Trinsic Cheat Room
This is accessible at the very beginning of the game, before you've even done the copy-protection test (this can therefore be used to bypass it). Simply take the crates from Christopher's smithy and stack them to make a staircase up to the roof. Walk onto the roof and behind the chimney to enter the cheat room.

You'll end up in the room inset to the bottom-left of the picture. Hit the switch to open the metal door. Take what you want from the chests, or step onto the teleporter to end up in another corridor. Go along that corridor to enter the larger room.

The numbers refer to sextant coordinates (or ones as close as can be determined, some areas are inside where the sextant naturally doesn't work).

All items on teleporters act identical to their legal ingame equivalents; the gold can be spent, the Cadellite Helm worn, etc. etc. etc.