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                   Versioni americane                   Versioni europee   Versioni giapponesi
• Obitus
• Ogre Battle - The March of the Black Queen
• Olympic Summer Games
• On the Ball
• Operation Europe - Path to Victory 1939-45
• Operation Logic Bomb
• Operation Thunderbolt
• Oscar
• Out of This World
• Out to Lunch
• Outlander
• Olympic Summer Games
• On the Ball
• Operation Starfish
• Operation: Logic Bomb
• Oscar
• Out to Lunch, Pierre le Chef is....
• Outlander
• Ochan no Oekaki Logic
• Oda Nobunaga: Haou no Gundan
• Odekake Lester: Lelele no Le
• Oekaki Logic
• Oekaki Logic 2
• Okamoto Ayako to Match Play Golf
• Olivia's Mystery
• Ongaku Tsukūru: Kanadeeru
• Onita Atsushi FMW
• Onizuka Katsuya Super Virtual Boxing
• Oomono Black Bass Fishing: Jinzouko Hen
• Oraga Land Shusai: Best Farmer Shuukaku-Sai
• Ossu!! Karatebu
• Othello World
• Otoboke Ninja Colosseum
• Otogirisou
• Outer World
• Ōzumō Spirit