arcade ：Olympus (Z Games, version 10)

arcade ：Olympic 5 (V112US)

arcade ：Olympic 5 (V107US)

arcade ：Olympic Soccer '92 (set 1)

arcade ：Olympic Soccer '92 (set 2)

arcade ：Olympic Soccer '92 (set 3)

arcade ：Omar I

arcade ：Omar II

arcade ：Omega (earlier)

arcade ：Omega (bootleg?)

arcade ：Omega Fighter Special

arcade ：Omega Race (set 2)

arcade ：Omega Race (set 3, 7/27)

arcade ：Omni

arcade ：One + Two (earlier)

arcade ：Onliner Touch Party

arcade ：Onna Sanshirou - Typhoon Gal (bootleg)

arcade ：Open 5 Cards

arcade ：Opa Opa (Rev A, unprotected)

arcade ：Konami's Open Golf Championship (ver EAD)

arcade ：2 On 2 Open Ice Challenge (rev 1.2A)

arcade ：Open Mahjong (Japan)

arcade ：Operation Tiger (Ver 2.10 O)

arcade ：Operation Tiger (Ver 2.09 J)

arcade ：Operation Tiger Second Mission (Ver 2.02 J)

arcade ：Operation Wolf 3 (Japan)

arcade ：Operation Wolf 3 (US)

arcade ：Operation Wolf (World, rev 2, set 2)

arcade ：Operation Bear (bootleg of Operation Wolf)

arcade ：Operation Wolf (Japan, rev 2)

arcade ：Operation Wolf (Japan, SC)

arcade ：Operation Wolf (Japan, prototype)

arcade ：Operation Wolf (US, rev 2)

arcade ：Orange Club - Maru-hi Ippatsu Kaihou (Japan 880221)

arcade ：Orbatak (prototype)

arcade ：Orchid Mist (0100849V, NSW/ACT)

arcade ：Orchid Mist (0101241V, New Zealand)

arcade ：Ordyne (Japan)

arcade ：Ordyne (Japan, English Version)

arcade ：Orius (ver UAA)

arcade ：Oriental Legend 2 (V101, Oversea)

arcade ：Xiyou Shi E Zhuan 2 (V101, China)

arcade ：Saiyuu Shakuyakuden 2 (V101, Japan)

arcade ：Oriental Legend 2 (V103, Oversea)

arcade ：Xiyou Shi E Zhuan 2 (V103, China)

arcade ：Saiyuu Shakuyakuden 2 (V103, Japan)

arcade ：Xiyou Shi E Zhuan 2 (V104, China)

arcade ：Saiyuu Shakuyakuden 2 (V104, Japan)

arcade ：Oriental Legend / Xiyou Shi E Zhuan (ver. 105, Korean Board)

arcade ：Oriental Legend / Xiyou Shi E Zhuan (ver. 105, Taiwanese Board)

arcade ：Oriental Legend / Xiyou Shi E Zhuan (ver. 111, Chinese Board)

arcade ：Oriental Legend / Xiyou Shi E Zhuan (ver. 111, Korean Board)

arcade ：Oriental Legend / Xiyou Shi E Zhuan (ver. 111, Taiwanese Board)

arcade ：Oriental Legend / Xiyou Shi E Zhuan (ver. 112, Chinese Board)

arcade ：Oriental Legend / Xiyou Shi E Zhuan (ver. ???, Chinese Board)

arcade ：Oriental Legend / Xiyou Shi E Zhuan (ver. 112)

arcade ：OutRunners (Japan)

arcade ：OutRunners (US)

arcade ：Oscar (0100348V, NSW/ACT)

arcade ：Psycho-Nics Oscar (World revision 0, bootleg)