| MAME Name | Description | Official | Alternate | VC WS | ||
 | uballoon | Ultra Balloon | - | - | 157 kB 06-Aug-2022 Download | |
 | uccops | Undercover Cops (World) | - | - | 1.65 MB 06-Aug-2022 Download | |
| uccopsar | Undercover Cops - Alpha Renewal Version (World) | - | - | 158 kB 06-Aug-2022 Download | |
| ufosensi | Ufo Senshi Yohko Chan (MC-8123, 317-0064) | - | - | 117 kB 06-Aug-2022 Download | |
| ultennis | Ultimate Tennis | - | - | 68.2 kB 06-Aug-2022 Download | |
| ultraman | Ultraman (Japan) | - | - | 122 kB 06-Aug-2022 Download | |
 | ultratnk | Ultra Tank | - | 3.21 MB 06-Aug-2022 Download | 76.3 kB 06-Aug-2022 Download | |
| ultrax | Ultra X Weapons / Ultra Keibitai | - | - | 551 kB 06-Aug-2022 Download | |
| umanclub | Ultraman Club - Tatakae! Ultraman Kyoudai!! | - | - | 233 kB 06-Aug-2022 Download | |
 | umk3 | Ultimate Mortal Kombat 3 (rev 1.2) | 8.77 MB 06-Aug-2022 Download | - | 1.38 MB 19-May-2023 Download | |
 | unclepoo | Uncle Poo | - | - | 315 kB 06-Aug-2022 Download | |
 | undrfire | Under Fire (World) | - | - | 409 kB 06-Aug-2022 Download | |
 | unicornd | Unicorn Dreaming (0100791V, NSW/ACT) | - | 629 kB 06-Aug-2022 Download | - | |
 | unicorndnz | Unicorn Dreaming (0101228V, New Zealand) | - | 629 kB 06-Aug-2022 Download | - | |
 | uniwars | UniWar S | - | - | 1.28 MB 06-Aug-2022 Download | |
 | unsquad | U.N. Squadron (USA) | 15.7 MB 06-Aug-2022 Download | - | 4.60 MB 06-Aug-2022 Download | |
 | uopoko | Puzzle Uo Poko (World) | 929 kB 06-Aug-2022 Download | - | 3.16 MB 06-Aug-2022 Download | |
 | upndown | Up'n Down (315-5030) | 352 kB 06-Aug-2022 Download | - | 7.44 MB 06-Aug-2022 Download | |
| upscope | Up Scope | - | - | 168 kB 06-Aug-2022 Download | |
| upyoural | Up Your Alley | - | - | 145 kB 06-Aug-2022 Download | |
 | usclssic | U.S. Classic | - | - | 8.26 MB 06-Aug-2022 Download | |
 | usvsthem | Us vs. Them | 790 kB 06-Aug-2022 Download | - | 335 kB 06-Aug-2022 Download | |
| utoukond | Ultra Toukon Densetsu (Japan) | - | - | 76.6 kB 06-Aug-2022 Download | |
