Oshare Princess EX Primo Debut Monogatari & Renai Uranai Daisakusen (Japan) Gameboy Advance GAME ROM ISO

Oriental Legend Special – Xi Yo Gi Shi Re Zuang Super (V103, China, Tencent) (unprotected) Arcade GAME ROM ISO

Octapolis.English (USA) Commodore 64 GAME ROM ISO

Operation Wolf_Disk2 (USA) Amiga 500 GAME ROM ISO

Oscarj1 (USA) MAME 037b11 GAME ROM ISO

Ozumou Damashii (Japan) Super Nintendo GAME ROM ISO

Ooedo Senryoubako (Japan) Playstation Portable GAME ROM ISO

Otogirisou (Japan) Super Nintendo GAME ROM ISO

Overtop (USA) MAME 037b11 GAME ROM ISO

Omega (1984)(SGM)[k-file] (USA) Atari 800 GAME ROM ISO

Ojanko Yakata 2bankan (Japan) MAME 2003 Plus GAME ROM ISO

Our House (US)(Suxxors) (USA) Nintendo DS GAME ROM ISO