| W-Item Bugfix | Ortew | Final Fantasy VII | Role Playing | PSX | O | Bug Fix | 1.1 | 27 Jan 2021 |
| Shop Menu Bugfix | Ortew | Final Fantasy VII | Role Playing | PSX | T, O | Bug Fix | 1.0 | 29 Sep 2019 |
| Pocket Alpha 3 | Ortew | Street Fighter Alpha 3 | Action > Fighting | PSX | O | Improvement | 1.1 | 07 Jan 2021 |
| Darkstalkers 3 - Uncensored Hack | Ortew | Darkstalkers 3 | Action > Fighting | PSX | G, O | Improvement | 1.0 | 18 Jan 2021 |
| Super Mario RPG: PAL Version | OrangeLightning86 | Super Mario RPG: Legend of the Seven Stars | Role Playing | SNES | G, T | Improvement | 1.0 | 18 Feb 2011 |
| Super Orb Bros. | Or4ng33xp0 | Super Mario Bros. 3 | Action > Platformer | NES | G, S, L, T, GP | Complete | 1.0 | 02 Sep 2020 |
| Guardian Legend Secret Edition | Optomon | The Guardian Legend | Action > Shooter | NES | L, T, GP | Complete | 3.3 | 20 Mar 2010 |
| Simon's Quest: Lame Edition | Optomon | Castlevania II: Simon’s Quest | Role Playing > Action RPG | NES | L, T, GP | Complete | 1.0 | 23 May 2010 |
| Castlevania: The Holy Relics | Optomon | Castlevania | Action > Platformer | NES | G, S, L, T, GP, O | Complete | 1.0 | 01 Dec 2017 |
| Opoona Re-localization Patch | Opoonaproject | Opoona | Role Playing | WII | T | Improvement | 1.1 | 11 Jun 2020 |
| Final Fantasy III - No experience patch | Oondipoondi | Final Fantasy III | Role Playing | SNES | GP | Improvement | 1.0 | 05 Jun 2018 |
| Castlevania PoR Saturn Richter | Oocities | Castlevania: Portrait of Ruin | Role Playing > Action RPG | NDS | G | Addendum | 1.0 | 26 Jan 2021 |
| Super Mario Bros: Death Moon | OnyxFusionHacks | Super Mario Bros. | Action > Platformer | NES | G, L, T, GP | Complete | 1.0 | 24 Jul 2018 |
| Ranger of Rage 2 | ONLYUSEmeFEET | Streets of Rage 2 | Action > Beat 'Em Up | GEN | G | Improvement | 1.0 | 08 Aug 2018 |
| Dr. Robotnik's MBM - 4 Colors for Battle | ONLYUSEmeFEET | Dr. Robotnik's Mean Bean Machine | Puzzle | GEN | G, GP | Improvement | 1.0 | 30 Sep 2020 |
| The New Mario World | OnlineVideoSurfer | Super Mario World | Action > Platformer | SNES | G, L, GP | Complete | 1.1 | 10 Sep 2009 |
| Magician | Onion Knight BR | Nuts & Milk | Action | NES | G, T | Improvement | 1.0 | 10 Sep 2012 |
| Metroid: SR387 | OneOf99 | Metroid: Zero Mission | Action > Platformer | GBA | G, S, L, T, GP, O | Complete | 1.0 | 06 Jul 2018 |
| SMB Score Hack | onefineday | Super Mario Bros. | Action > Platformer | NES | GP | Improvement | 1.0 | 27 Aug 2020 |
| Strider - Matic Unit | Omnizero | Strider | Action > Platformer | NES | G, T | Improvement | 1.0 | 30 Jun 2002 |
