Oozumou – The Grand Sumo (DECO Cassette) (Japan) Arcade GAME ROM ISO

Oyaku De Asoberu DS Ehon – Ukkari Penelope (Japan) Nintendo DS GAME ROM ISO

Onna Sansirou – Typhoon Gal Arcade GAME ROM ISO

Onizuka Katsuya Super Virtual Boxing (Japan) Super Nintendo GAME ROM ISO

Othello World (Japan) Super Nintendo GAME ROM ISO

Over Top Arcade GAME ROM ISO

On Cue – Snooker (19xx)(-)[cr Mr.Bacardi] (USA) Atari 800 GAME ROM ISO

Ozmawars (USA) MAME 037b11 GAME ROM ISO

One Piece – Gear Spirit (Coolpoint) (Korea) Nintendo DS GAME ROM ISO

Out Run Europa_Disk1 (USA) Amiga 500 GAME ROM ISO

Operationneptun (USA) Commodore 64 GAME ROM ISO

Osawari Tantei – Ozawa Rina (Japan) Nintendo DS GAME ROM ISO