Title  | Released By | Genre | Platform | Status | Ver | Date | Lang |
|---|---|---|---|---|---|---|---|
| Underground Monster | Umbrella Terms | Action | PC88 | Fully Playable | 1.0 | 08 May 2022 | EN |
| Underground Mission | pacnsacdave | Action > Platformer | NES | Fully Playable | 1.0 | 21 Jan 2020 | EN |
| Undercover Cops | RPGONE | Action > Beat 'Em Up | SNES | Fully Playable | 1.0 | 03 Feb 2019 | EN |
| Undeadline: Genjuuki | Jon Najar | Action > Shooter | X68K | Fully Playable | 1.0 | 31 Oct 2007 | EN |
| Undead Line | Jon Najar | Action > Shooter | GEN | Fully Playable | 070903 | 06 Sep 2007 | EN |
| Umihara Kawase | satsu | Action > Platformer | SNES | Fully Playable | 0.90 | 02 Jun 2007 | EN |
| Umihara Kawase | Green Jerry | Action > Platformer | SNES | Addendum | 1.0 | 25 Dec 2020 | EN |
| Ultraman Club: Kaijuu Daikessen!! | Eric Engel | Action > Platformer | NES | Fully Playable | 1.0 | 08 Nov 2017 | EN |
| Ultraman Chou Toushi Gekiden | gorgyrip | Action | GB | Fully Playable | 1.0 | 12 Jul 2015 | EN |
| Ultraman Ball | Suicidal Translations | Action > Platformer | GB | Unfinished | 0.99 | 28 Feb 2003 | EN |
| Ultra Baseball Jitsumeiban | VX | Sports | SNES | Fully Playable | 1.04 Final | 22 Mar 2009 | EN |
| Uchuusen Cosmo Carrier | Gil Galad | Action > Shooter | NES | Unfinished | 0.25 | 13 Aug 2002 | EN |
| Uchuujin Tanaka Tarou de RPG Tsukuru GB2 | PentarouZero | Game Creation | GB | Unfinished | 0.50 | 25 Dec 2002 | EN |
| Uchuujin Tanaka Tarou de RPG Tsukuru GB2 | MageCraft Translations | Game Creation | GB | Unfinished | 0.20 | 11 Mar 2002 | EN |
| Uchuu no Kishi Tekkaman Blade | D | Action | SNES | Fully Playable | 1.0 | 03 Oct 2004 | EN |
| U-four-ia: The Saga | BMF54123 | Action > Platformer | NES | Fully Playable | 1.0 | 27 Feb 2013 | EN |
| Twinkle Tale | Jon Najar | Action > Shooter | GEN | Fully Playable | 070328 | 28 Mar 2007 | EN |
| TwinBee: Rainbow Bell Adventure | Aeon Genesis | Action > Platformer | SNES | Fully Playable | 1.01 | 28 Nov 2013 | EN |
| TwinBee 3: Poko Poko Dai Maou | Demiforce | Action > Shooter | NES | Unfinished | 1.02 | 11 Jan 1998 | EN |
| TwinBee 3: Poko Poko Dai Maou | Stardust Crusaders | Action > Shooter | NES | Fully Playable | 1.01 | 19 Mar 2014 | EN |
