PC

Galactic CivilizationsCheat Keys11/13/03
Pinball ArcadeMisc. Codes08/27/04
The Elder Scrolls III: MorrowindInfinite 1 Gold Training Sessions01/20/04

Xbox

Black Stone: Magic & SteelHidden Character Class01/02/04
SSX 3Characters and Items11/02/03
Star Wars: Knights of the Old RepublicItem Duping10/02/03
The Elder Scrolls III: Morrowind - Game of the Year EditionInfinite 1 Gold Training Sessions01/07/04

Xbox 360

YarisAchievements10/12/07