| Title |
Year |
Genre |
| Off Road Challenge |
1997 |
Racing |
| Off the Wall |
1991 |
Breakout |
| Offensive |
1981 |
Shooter |
| Office Yeo In Cheon Ha |
2001 |
Arcade |
| Oh My God! |
1993 |
Puzzle |
| Oh! Paipee |
1989 |
Puzzle |
| Oishii Puzzle Ha Irimasenka |
1993 |
Puzzle |
| Ojanko Club |
1986 |
Mahjong |
| Ojanko High School |
1988 |
Mahjong |
| Ojanko Yakata |
1986 |
Mahjong |
| Ojanko Yakata 2bankan |
1987 |
Mahjong |
| Ojousan |
1987 |
Mahjong |
| Ojousan |
1987 |
Mahjong |
| Oli-Boo-Chu |
1981 |
Arcade |
| Olivmandingo |
1982 |
Arcade |
| Omega |
???? |
Shooter |
| Omega Fighter |
1989 |
Shooter |
| Omega Race |
1981 |
Shooter |
| Omotesandou |
1989 |
Cards |
| One + Two |
1997 |
Puzzle |
| One Shot One Kill |
???? |
Gun shooter |
| Onna Sansirou - Typhoon Gal |
1985 |
Fighting |
| OOPArts |
1992 |
Breakout |
| Oozumou - The Grand Sumo |
1984 |
Sports |
| Opa Opa |
1987 |
Arcade |
| Open Mahjong |
1981 |
Mahjong |
| Open Mahjong |
1981 |
Mahjong |
| Operacion Defender |
1981 |
Shooter |
| Operation Thunder Hurricane |
1997 |
Gun shooter |
| Operation Thunderbolt |
1988 |
Gun shooter |
| Operation Tiger |
1998 |
Gun shooter |
| Operation Wolf |
1987 |
Gun shooter |
| Operation Wolf 3 |
1994 |
Gun shooter |
| Orange Club - Maru-hi Ippatsu Kaihou |
1988 |
Mahjong |
| Orange Club - Maruhi Kagai Jugyou |
1988 |
Mahjong |
| Orbit |
1978 |
Shooter |
| Orbite |
1979 |
Shooter |
| Orbitron |
???? |
Shooter |
| Orbs |
1994 |
Puzzle |
| Ordyne |
1988 |
Shooter |
| Oriental Legend / Xi Yo Gi Shi Re Zuang |
1997 |
Beat em up |
| Oriental Legend 2 |
2007 |
Beat em up |
| Oriental Legend Super / Xiyou Shi E Chuan Super |
1998 |
Beat em up |
| Orius |
1991 |
Shooter |
| Osman |
1996 |
Action |
| Otakara Itadaki Luffy Kaizoku-Dan! |
2001 |
Arcade |
| Otenami Haiken |
1999 |
Puzzle |
| Otenki Kororin |
2001 |
Puzzle |
| Othello |
1984 |
Puzzle |
| Othello Derby |
1995 |
Puzzle |
