^{Da DVG - Il Dizionario dei Videogiochi}

• OFF ROAD CHALLENGE
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• OH MY GOD!
• OHGON NO SIRO
• OIGAS
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• OJANKO CLUB
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• OJOUSAN
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• ONE SHOT ONE KILL
• ONI - THE NINJA MASTER
• ONNA SANSIROU - TYPHOON GAL
• OPA OPA
• OPERATION BEAR
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• OPERATION WOLF
• OPERATION WOLF 3
• ORANGE CLUB - MARU-HI IPPATSU KAIHOU
• ORANGE CLUB - MARUHI KAGAI JUGYOU
• ORBIT
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• OUT RUN
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• OZMA WARS
• OZON I