機種名	タイトル
SNES	Obitus
GBUSA	Oddworld Adventures
GBCUSA	Oddworld Adventures II
GBAUSA	Oddworld - Munch's Oddysee
SNES	Ogre Battle: March of the Black Queen
GENESIS	Oh Mummy
GBCUSA	O'Leary Manager 2000
GGUSA	Olympic Gold
GENESIS	Olympic Gold: Barcelona '92
SNES	Olympic Summer Games
GBUSA	Olympic Summer Games
GENESIS	Olympic Summer Games: Atlanta 1996
GBAUSA	One Piece
GBAUSA	Onimusha Tactics
GENESIS	Onslaught
SNES	On the Ball
GBAUSA	Open Season
GBAUSA	Operation Armored Liberty
GBUSA	Operation C
SNES	Operation Europe: Path to Victory
SNES	Operation Logic Bomb
SNES	Operation Thunderbolt
NES	Operation Wolf
NES	Orb-3D
TG16	Order of the Griffon
TG16	Ordyne
SNES	Oscar
NES	Othello
GBUSA	Othello
GBUSA	Otto's Ottifanten - Baby Bruno's Nightmare
SNES	Outlander
GENESIS	Outlander
GBUSA	Out of Gas
SNES	Out of This World
GENESIS	OutRun
GGUSA	Out Run
GENESIS	OutRun 2019
GGUSA	Out Run Europa
SNES	Out to Lunch
NES	Over Horizon
NES	Overlord
GBAUSA	Over the Hedge
GBAUSA	Over the Hedge - Hammy Goes Nuts!
GBAUSA	Ozzy & Drix