Game Boy

Burai Fighter DeluxeSpecial passwords10/25/10
Castle QuestLevel Passwords04/10/06
Fortified ZoneJapanese Version Passwords11/19/10
Ikari no Yousai 2Animation & ending07/26/10
Ikari no Yousai 2SD mode07/26/10
Krusty's Fun HouseLevel Codes03/11/02
True LiesPasswords10/25/10

Game Boy Color

Genesis

Fido DidoLevel passwords06/08/04
Slaughter SportUnlock Fighters04/22/02

NeoGeo

The King of Fighters '96Holiday Easter Egg10/11/05

NeoGeo Pocket Color

SNK Gals FightersFight Yuki10/21/05

NES

Batman ReturnsCredits Easter Egg07/20/02
Day Dreamin' DaveyPasswords03/26/03
G.I. Joe: A Real American HeroStage Passwords05/05/03
Godzilla: Monster of Monsters!Level Passwords12/09/02
KickMasterPasswords05/27/01
Krusty's Fun HousePasswords12/09/02
The Uncanny X-MenCheat Codes12/09/02
Toxic CrusadersLevel Passwords12/18/01

Super Nintendo

Bobby's WorldPasswords06/18/09
Dream T.V.99 lives08/02/10
Spider-Man: Lethal FoesSpecial passwords08/06/12
Super Back to the Future 2View cut-scenes10/25/10
Super Bomberman 3Codes01/14/02