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Games
O'Mac Farmer - MSX
O'Riley's Mine - Commodore 64
O.D.T. - PC
Obee: Tale of the Circus - PlayStation
Obelix - Atari 2600
Obelix - Game Boy Color
Ocean Battle - Arcadia 2001
Ochaken no Heya DS 2 - DS
Octagon Squad - MSX
Octapolis - Commodore 64
Octopus - Atari 2600
Odenkun: Tanoshii Oden Mura - DS
Odyssey - Commodore 64
Off Your Rocker - Atari 2600
Oha Star Yamachan & Reimondo - Game Boy Color
Oi de Rascal - Game Boy Color
Oil's Well - Atari 8-bit
Oil's Well - Colecovision
Oils Well - Commodore 64
Oink! - Atari 2600
Ojaru Maru: Mitsunegai Jinja no Ennichi de Ojaru! - Game Boy Color
Ojaru-Maru DS: Ojaru to Okeiko Aiueo - DS
Olsen Banden - Mobile
Omega Race - Colecovision
Omikron: The Nomad Soul - PlayStation
Omikuji - MSX
On the Ball - SNES
One - PlayStation
One Man and His Droid - Commodore 64
One Piece Dragon Dream - Game Boy Advance
One Piece Mansion - PlayStation
One Piece Unlimited Cruise: Episode 1 - Wii
One Piece Unlimited Cruise: Episode 2 - Wii
One Piece: Niji no Shima Densetsu - WonderSwan Color
One Piece: Treasure Wars - WonderSwan Color
One Piece: Unlimited Adventure - Wii
One-On-One - Colecovision
Oneechanbara Revolution - Wii
Onslaught - Genesis
Ooedo Senryoubako - PSP
Ooga Booga - Dreamcast
Ookiku Furika Butte - DS
Open! Sesame - Atari 2600
Operation Air Assault 2 - PlayStation 2
Operation Armored Liberty - Game Boy Advance
Operation Creature Feature - PlayStation 3
Operation Gunship - Amstrad CPC
Operation Secret Storm - NES
Operation Tiger Hunt - PC
Operation Wolf - Amstrad CPC
Orb 3-D - NES
Orbz - PC
Orc Attack - Commodore 64
Order Up! - Wii
Ore no Shite Agake - PlayStation 2
Oretachi Game Center: Pooyan - PlayStation 2
Oscar's Trash Race - Atari 2600
Osomatsu-kun: Hachamecha Gekijou - Genesis
Osouji Sentai Clean Keeper - Wii
Osprey! - Commodore 64
Ostfrieslandgames - Commodore 64
Otenba Becky no Daibouken - MSX
Othello - Atari 2600
Otoboke Ninja Colosseum - SNES
Otonaryoku Kentei - DS
Out Of Control - Atari 2600
Out of This World! - Odyssey^2
Out of this World! / Helicopter Rescue! - Odyssey^2
Outback - Commodore 64
Outburst - PC
Outlander - Genesis
Outlander - SNES
Outlands - Amiga
Outlaw - Atari 2600
Outlaw Chopper - PC
Outlaw Chopper - Xbox
Outlaw Golf & SeaBlade Bundle - Xbox
Outlaws - PC
Outtrigger - Dreamcast
Owarai Yowiko no Game-dou: Oyaji Sagashite Sanchoume - Game Boy Color
Owarai Zunou Battle: Nobunaga no Yabou - DS
Oxxonian - Commodore 64
Oyaku de Asoberu DS Ehon: Ukkari Penelope - DS