| Title | Year | Genre |
|---|---|---|
| Ochan no Oekaki Logic | 1995 | Puzzle |
| Ochige Designer Tsukutte Pon! | 1997 | Other |
| Off-World Interceptor Extreme | 1995 | Racing |
| Ojousama o Nerae!! | 1998 | Adventure |
| Ojousama Tokkyuu Express | 1998 | Adventure |
| Okudera Yasuhiko no Sekai o Mezase! Soccer Kids - Nyuumon Hen | 1996 | Soccer |
| Olympic Soccer - Atlanta 1996 | 1996 | Sports |
| Olympic Soccer | 1996 | Soccer |
| Omakase! Taimawaza | 1996 | Adventure |
| Ooedo Renaissance | 1997 | Strategy |
| Oracle no Houseki - Jewels of the Oracle | 1996 | Adventure |
| Ousama Game | 1998 | Arcade |
