Dreamcast

Game Boy

TetrisMore Choice Pieces07/06/05
Tetris 2More Choice Pieces07/07/05

Game Boy Color

Hamtaro: Ham-Hams Unite!Gameboy Change10/03/03
Spider-ManPasswords01/12/02
Tetris DXMore Tetris Pieces10/14/04

GameCube

Shadow the HedgehogHidden Vehicles11/21/05
Shadow the HedgehogLibrary Cutscenes11/23/05
Sonic Gems CollectionVectorman In-Game Codes03/15/06
The Legend of Zelda: Ocarina of Time / Master QuestFree faeries11/24/04

Genesis

Ecco Jr.Level Passwords05/27/03
Sonic & KnucklesWalk through walls04/19/06
Sonic the Hedgehog 3Frame by frame07/08/05

NES

TetrisMore Choice Pieces07/07/05
Tetris (Tengen)More Choice Pieces07/07/05
Tetris 2More Choice Pieces07/07/05

PC

SoldatF1 Codes01/09/06

PlayStation 2

Shadow the HedgehogLibrary Cutscenes11/28/05

PlayStation 3

Uncharted 2: Among ThievesTweaks on a difficulty you haven't finished.10/21/09

Wii

Driver: Parallel LinesCollecting Stars07/19/07
Metroid Prime 3: CorruptionSecret Message from Iwata.08/29/07

Xbox

Shadow the HedgehogLibrary Cutscenes11/28/05