| Off Road Challenge (v1.63) |
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| Off the Wall (2/3-player upright) |
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| Off the Wall (Sente) |
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| Office Yeo In Cheon Ha (version 1.2) |
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| Oh My God! (Japan) |
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| Oishii Puzzle Ha Irimasenka |
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| Ojanko Club (Japan) |
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| Ojanko High School (Japan) |
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| Ojanko Yakata (Japan) |
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| Ojanko Yakata 2bankan (Japan) |
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| Ojousan (Japan 871204) |
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| Old Timer |
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26,83 Kb |
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| Oli-Boo-Chu |
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| Omega Fighter |
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| Omega Race |
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| Omotesandou (Japan 890215) |
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| One + Two |
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| One Shot One Kill |
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| Onna Sansirou - Typhoon Gal (set 1) |
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| Opa Opa (MC-8123, 317-0042) |
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| Operation Thunder Hurricane (ver EAA) |
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Vedi Set |
| Operation Thunderbolt (World) |
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| Operation Tiger |
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| Operation Wolf (World, set 1) |
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| Operation Wolf 3 (World) |
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| Orange Club - Maruhi Kagai Jugyou (Japan 880213) |
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| Orbit |
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| Orbitron |
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| Orbs (10/7/94 prototype?) |
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| Ordyne (Japan, English Version) |
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| Oriental Legend / Xi You Shi E Zhuan (ver. 126) |
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| Oriental Legend Special / Xi You Shi E Zhuan Super (ver. 101, Korean Board) |
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| Oriental Legend Special Plus / Xi You Shi E Zhuan Super Plus |
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| Osman (World) |
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| Otenami Haiken (V2.04J) |
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| Otenami Haiken Final (V2.07JC) |
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| Otenki Kororin (V2.01J) |
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| Othello (version 3.0) |
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| Othello Derby (Japan) |
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| Othello Shiyouyo (J 980423 V1.002) |
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| Otogizoushi Urashima Mahjong (Japan) |
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| Otona no Mahjong (Japan 880628) |
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| Out Run (Mega-Tech, SMS based) |
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139,81 Kb |
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| Out Run (sitdown/upright, Rev B) |
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| Out Zone (set 1) |
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| Outfoxies (World, OU2) |
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| OutRunners (World) |
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| OutTrigger (JPN, USA, EXP, KOR, AUS) |
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| Over Drive |
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| Over Rev (Revision A) |
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| Over Top |
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| Ozma Wars (set 1) |
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| Ozon I |
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