Title  | Released By | Genre | Platform | Status | Ver | Date | Lang |
|---|---|---|---|---|---|---|---|
| Kaiketsu Yanchamaru 2: Karakuri Land | D | Action > Platformer | NES | Fully Playable | 1.2 | 03 Apr 2004 | EN |
| Kaiketsu Yanchamaru 2: Karakuri Land | Zynk Oxhyde | Action > Platformer | NES | Fully Playable | 1.0 | 30 May 2020 | EN |
| Kaijuu Monogatari | KingMike's Translations | Role Playing | NES | Fully Playable | 1.0beta2 | 16 Apr 2006 | EN |
| Kaguya Hime Densetsu | snark | Adventure | NES | Fully Playable | 0.99 | 30 Nov 2009 | EN |
| Kaettekita Mario Bros. | MrRichard999 | Action > Platformer | FDS | Fully Playable | 0.98 | 21 Aug 2016 | EN |
| Kaettekita Mario Bros. | FCandChill | Action > Platformer | FDS | Fully Playable | 1.0 | 30 Nov 2021 | EN |
| Kaeru no Tame ni Kane wa Naru | ryanbgstl | Role Playing > Action RPG | GB | Fully Playable | 1.0 | 10 Jul 2011 | EN |
| Kaeru no Tame ni Kane wa Naru | Hamikon | Role Playing > Action RPG | GB | Addendum | 1.0 | 11 Apr 2022 | EN |
| Kabuki Quantum Fighter | Stardust Crusaders | Action > Platformer | NES | Fully Playable | 1.01 | 06 Nov 2013 | EN |
| Juvei Quest | Stardust Crusaders | Role Playing | NES | Fully Playable | 1.01 | 15 Apr 2013 | EN |
| Juuouki | aka translations | Action > Beat 'Em Up | NES | Fully Playable | 1.0 | 13 Jun 2005 | EN |
| Jutei Senki | Aeon Genesis | Strategy > Turn Based | SNES | Fully Playable | 1.00 | 03 Apr 2003 | EN |
| Just Breed | obsolete translation | Strategy > Turn Based | NES | Unfinished | 0.001 beta | 11 Jul 2000 | EN |
| Just Breed | Stealth Translations | Strategy > Turn Based | NES | Fully Playable | 1.00 | 11 Jan 2004 | EN |
| Jumpin' Kid: Jack to Mame no Ki Monogatari | RistarTheStar | Action > Platformer | NES | Fully Playable | 1.0 | 27 Jan 2020 | EN |
| Jump Ultimate Stars | JUS Translation | Action > Fighting | NDS | Fully Playable | 03/05/08 | 03 May 2008 | EN |
| Joy Mech Fight | AlanMidas | Action > Fighting | NES | Fully Playable | joy.mech | 15 Dec 2000 | EN |
| JoJo no Kimyou na Bouken: Phantom Blood | Hudgyn Sasdarl | Action > Beat 'Em Up | PS2 | Fully Playable | 1.1 | 15 Aug 2021 | EN |
| JoJo no Kimyou na Bouken: Ougon no Kaze | JoJo's Colored Adventure | Action > Beat 'Em Up | PS2 | Fully Playable | 1.0 | 20 Oct 2018 | EN |
| JoJo no Kimyou na Bouken: Ougon no Kaze | Hudgyn Sasdarl | Action > Beat 'Em Up | PS2 | Fully Playable | 3.002 | 12 Mar 2022 | EN |
