DS

Yakuman DSUnlocking Characters04/10/06

GameCube

Shadow the HedgehogLibrary Cutscenes11/23/05
Shadow the HedgehogUnlockable Songs11/23/05
Sonic Gems CollectionPasswords - Tails Adventure08/19/05
Sonic Gems CollectionSonic CD Codes - Sound Test Mode08/18/05
Sonic HeroesCG Theater01/09/04
Sonic HeroesMetal 2-Player Characters01/09/04
Sonic Mega CollectionBlue Sphere Passwords01/17/03
Sonic RidersUnlock Characters02/23/06

PlayStation 2

Sonic HeroesUnlockables01/30/04

Wii

Sonic and the Secret RingsUnlockable Awards02/27/07

Xbox

Sonic HeroesMetal 2-Player Characters02/02/04
Sonic HeroesUnlockables02/01/04

Xbox 360

Sonic GenerationsHow to Unlock Playable Super Sonic11/01/11