Game Boy

Mario's PicrossUnlock the Star Course.06/28/05

Game Boy Advance

Scooby-Doo 2: Monsters UnleashedExtra modes.05/10/05
Scooby-Doo 2: Monsters UnleashedLevel passwords05/10/05

NES

After BurnerHarder mode.07/06/05
Moai-KunStage Passwords07/22/05
PuzzleFinish levels very easily.05/31/05

PC

Theme HospitalGet rid of garbage easily.05/12/05
Theme ParkMake the people you hired go back to work when they're striking, without paying them.06/09/05

Xbox 360

Banjo-Kazooie: Nuts & Bolts - L.O.G.'s Lost ChallengesAchievements07/06/09
Costume QuestAchievements10/21/10
Crystal DefendersAchievements03/11/09
Dragon Ball Z: Burst LimitAchievements06/02/08
PeggleAchievements03/11/09