| Metroid99 | Maximum Potion | Metroid | Action Adventure | NES | GP | Improvement | 1.0 | 17 Jan 2009 |
| Metroid: Deep Freeze | Captain Glitch | Metroid: Zero Mission | Action > Platformer | GBA | G, L, T, GP | Complete | 1.4 | 27 Feb 2017 |
| Metroid: Spooky Mission | MAGConst | Metroid: Zero Mission | Action > Platformer | GBA | G, S, L, T, GP | Complete | 1.2 | 26 Feb 2018 |
| Metroid: SR387 | OneOf99 | Metroid: Zero Mission | Action > Platformer | GBA | G, S, L, T, GP, O | Complete | 1.0 | 06 Jul 2018 |
| Metroid: Wart's Invasion | AlexAR | Metroid | Action Adventure | NES | G, L, T | Complete | 1.0 | 21 May 2006 |
| Metroid: Zero Mission - AP Boss Rush | Trivial Man | Metroid: Zero Mission | Action > Platformer | GBA | L, T | Complete | 1.0 | 27 Jul 2016 |
| Metroid: Zero Mission - Chozo Hint Statue Removal | spiffy | Metroid: Zero Mission | Action > Platformer | GBA | GP, O | Improvement | 1.0 | 12 Feb 2017 |
| Mgos City | Mgos | Battle City | Action | NES | G, L, T, O | Complete | 1.01 | 01 Jan 2013 |
| Miami Vice: The Videogame | Crying Onion | Mottomo Abunai Deka | Action | NES | G, T | Improvement | 1.1 | 12 Dec 2019 |
| Mickey's Wild Adventure PAL to NTSC | Sakitoshi | Mickey's Wild Adventure | Action > Platformer | PSX | O | Improvement | 1.1 | 05 Feb 2018 |
| Midnight Resistance Color Hack | Pyron | Midnight Resistance | Action > Shooter | GEN | G | Improvement | 1.0 | 20 Jul 2014 |
| Might and Magic Fixer | Reiska | Might and Magic: Secret of the Inner Sanctum | Role Playing | NES | T | Bug Fix | 1.0 | 31 Dec 2014 |
| Might and Magic Restoration | Sanedan56 | Might and Magic: Secret of the Inner Sanctum | Role Playing | NES | G, T, GP, O | Complete | 1.0 | 19 Sep 2020 |
| Mighty Final Fight for 2 players | wangsitan | Mighty Final Fight | Action > Beat 'Em Up | NES | GP, O | Complete | 4.4 | 01 Apr 2013 |
| Mighty Final Fight: The Ultimate Confrontation | Sorinkun | Mighty Final Fight | Action > Beat 'Em Up | NES | L, T, GP | Addendum | 1.3 | 06 Jan 2017 |
| Mighty Morphin Power Rangers: The Movie - Enhanced Colors | Pyron | Mighty Morphin Power Rangers: The Movie | Action > Beat 'Em Up | GEN | G | Improvement | 1.0 | 26 Mar 2016 |
| Mighty the Armadillo in Sonic the Hedgehog | E-122-Psi | Sonic the Hedgehog | Action > Platformer | GEN | G, GP | Improvement | 1.1 | 25 Nov 2011 |
| Mike Tyson 2015 Remix | dougeff | Mike Tyson's Punch Out!! | Sports | NES | G, GP | Complete | 1.0 | 17 Jun 2015 |
| Mike Tyson's Punch-Out!! Restoration | SCD | Mike Tyson's Punch Out!! | Sports | NES | G, T, GP | Improvement | Final | 23 May 2017 |
| Mike Tyson's Punch-out!!?? | Hexadecimal Mantis | Mike Tyson's Punch Out!! | Sports | NES | G, T, GP, O | Complete | 1.1 | 07 Apr 2019 |
