| Kirby Hack | GGHGH | Kirby's Adventure | Action > Platformer | NES | L | Complete | 1.0 | 20 Feb 2020 |
| Kirby in Sonic the Hedgehog | Lone Devil | Sonic the Hedgehog | Action > Platformer | GEN | G, T, GP | Improvement | 2.0 | 25 Oct 2015 |
| Kirby in Sonic the Hedgehog 2 | Lone Devil | Sonic the Hedgehog 2 | Action > Platformer | GEN | G, T, GP | Improvement | 1.0 | 25 Oct 2015 |
| Kirby Keeps Weapon | TonyOsh | Kirby's Adventure | Action > Platformer | NES | GP | Improvement | 1.0 | 31 Jan 2019 |
| Kirby! (A Gimmick! ROM Hack) | TYFc | Mr. Gimmick | Action > Platformer | NES | G | Complete | 1.0 | 13 Dec 2019 |
| Kirby's Adventure Restitched | Giga571 | Kirby's Adventure | Action > Platformer | NES | L | Addendum | 2.0 | 01 Oct 2019 |
| Kirby's Adventure UFO Fix | Dizzy9 | Kirby's Adventure | Action > Platformer | NES | GP | Improvement | 1.0 | 25 Nov 2010 |
| Kirby's Adventure: Debug Edition | SKCro | Kirby's Adventure | Action > Platformer | NES | GP, O | Improvement | 1.0 | 16 Oct 2019 |
| Kirby's Dank Course | h2643 | Kirby's Dream Course | Sports | SNES | L | Complete | 1.0 | 08 Jul 2016 |
| Kirby's Dream Land DX | GreenAndACat | Kirby's Dream Land | Action > Platformer | GB | G, T | Improvement | 1.3 | 21 Jun 2020 |
| Kirby's Dream Land DX Revised | ShadowOne333 | Kirby's Dream Land | Action > Platformer | GB | G, T | Addendum | 1.0 | 02 Jan 2021 |
| Kirby's Halloween Adventure | Kirb-Star | Kirby's Adventure | Action > Platformer | NES | G, L, T | Complete | 1.3 | 05 Oct 2020 |
| Kirby’s Adventure 2 | Darkdata-Systemlogoff | Super Mario Bros. | Action > Platformer | NES | G, L, T | Complete | 1.0 | 09 Jun 2007 |
| Klax E1M1: At Doom's Gate | Damian Yerrick | Klax | Puzzle | NES | S | Improvement | 1.0 | 21 Sep 2018 |
| Klowneer's Marble Madness | S. K. Dumbbus | Marble Madness | Action | NES | G, T, GP, O | Improvement | 1.0 | 25 Feb 2017 |
| Knight Rider - MMC1 to MMC3 | infidelity | Knight Rider | Racing | NES | O | Improvement | 1.0 | 16 Nov 2013 |
| Knuckles & Tails | SonicHalloween | Sonic 3 & Knuckles | Action > Platformer | GEN | GP | Improvement | 1.0 | 29 Nov 2006 |
| Knuckles in Sonic 1 | Stealth | Sonic the Hedgehog | Action > Platformer | GEN | G, S, L, T, GP | Complete | 1.1 | 12 Sep 2005 |
| KOF 99'Evo - Krizalid Boss Hack | [John] | The King of Fighters NESTS Collection | Action > Fighting | PS2 | GP, O | Improvement | 1.0 | 11 Mar 2019 |
| Koko Adventure (MMC3 Conversion) | Ice Man | Buzz & Waldog | Action > Platformer | NES | O | Improvement | 1.00 | 14 Jun 2017 |
