| Name | Description | SW | HW | Pub |
|---|---|---|---|---|
| Tenkyuhai series | Based on the Chinese board game Tien Gow | 4 | 0 | 0 |
| Uchiyama Aki no Sexy Voice Series | System House Oh!'s official classification of their games featuring graphics by… | 4 | 0 | 0 |
| Ultima series | The Ultima series by Origin Systems. | 5 | 0 | 0 |
| Uwasa no Coliseum series | MSX Disk Communication issues featuring the Uwasa no Coliseum (Eng: rumored coli… | 3 | 0 | 0 |
| Veilig Leren Lezen | A serie of educational programs to learn the dutch language at school. Besides t… | 9 | 0 | 0 |
| Who chan series | Studio Esutoria's official designation of its games featuring the girl Who chan:… | 4 | 0 | 0 |
| Xak Series | Xak is a series of medieval-themed action role-playing games by Micro Cabin. | 2 | 0 | 0 |
| Xak universe | Contains Xak series as well as spin-offs set in the same universe. | 8 | 0 | 0 |
| Yaritai Hodai series | 5 | 0 | 0 | |
| Yoshida series | These shmup creators are titled as the growing construction company; Koumuten, J… | 3 | 0 | 0 |
| Ys series | YS is a series of RPG games by Falcom | 4 | 0 | 0 |
| Zanac series | 2 | 0 | 0 |