| Karate Champed | S. K. Dumbbus | Karate Champ | Action > Fighting | NES | G, T, O | Improvement | 1.0 | 26 Jan 2017 |
| Karnov - Hack by LANCUSTER | lancuster | Karnov | Action > Platformer | NES | G, L, T, GP, O | Improvement | 1.0 | 27 Jun 2016 |
| Smash Bros. | emotionengine | Kart Fighter | Action > Fighting | NES | G, T | Improvement | 1.0 | 01 Aug 2016 |
| Kart Fighter Improvement | Doomkid | Kart Fighter | Action > Fighting | NES | G | Improvement | 1.2 | 10 May 2020 |
| Sansuu 1 Toshi: Keisan Game - Kaeidzuka | DASTARD | Keisan Game: Sansuu 1 Toshi | Other | NES | G | Improvement | 1.0 | 01 Feb 2008 |
| Adoventoro Tcheco | MacBee | Kero Kero Keroppi no Daibouken 2: Donuts Ike ha Oosawagi! | Action > Platformer | NES | G, L, T | Complete | 1.0 | 21 Jul 2007 |
| Kid Icarus ZZ | Zalbag | Kid Icarus | Action > Platformer | NES | G, L, T | Improvement | 1.0 | 04 Jul 2011 |
| Kid Icarus in NES Land Journey | Redrum | Kid Icarus | Action > Platformer | NES | G | Improvement | 1.0 | 01 Aug 2008 |
| Kid Icarus - Retold | dACE | Kid Icarus | Action > Platformer | NES | G | Improvement | 1.2 (240) | 29 Mar 2014 |
| Kid Icarus MMC1 to MMC3 Hack | infidelity | Kid Icarus | Action > Platformer | NES | O | Improvement | 1.0 | 07 Jun 2015 |
| King's Quest V - SCI Font | Big Hairy Marty | King's Quest V: Absence Makes the Heart Go Yonder | Adventure | NES | G | Improvement | 1.0 | 11 Feb 2017 |
| Kirby's Adventure UFO Fix | Dizzy9 | Kirby's Adventure | Action > Platformer | NES | GP | Improvement | 1.0 | 25 Nov 2010 |
| Warioland 2 | pacnsacdave | Kirby's Adventure | Action > Platformer | NES | G, T, GP | Complete | 1.0 | 27 Jun 2015 |
| Vegetable Valley Nightmare | RhysOwens101 | Kirby's Adventure | Action > Platformer | NES | G, S, L, GP | Complete | 1.05 | 08 Jan 2017 |
| Kirby's Adventure Restitched | Giga571 | Kirby's Adventure | Action > Platformer | NES | L | Addendum | 2.0 | 01 Oct 2019 |
| Kirby Keeps Weapon | TonyOsh | Kirby's Adventure | Action > Platformer | NES | GP | Improvement | 1.0 | 31 Jan 2019 |
| Kirby's Halloween Adventure | Kirb-Star | Kirby's Adventure | Action > Platformer | NES | G, L, T | Complete | 1.3 | 05 Oct 2020 |
| Squeaky Clean Adventure | Polargames | Kirby's Adventure | Action > Platformer | NES | G, L | Improvement | 2.0 | 13 Jan 2021 |
| Kirby's Adventure: Debug Edition | SKCro | Kirby's Adventure | Action > Platformer | NES | GP, O | Improvement | 1.0 | 16 Oct 2019 |
| Kirby Hack | GGHGH | Kirby's Adventure | Action > Platformer | NES | L | Complete | 1.0 | 20 Feb 2020 |
