| Impossible? Zombies Ate My Neighbors | Joseph K | Zombies Ate My Neighbors | Action | SNES | G, L, T | Complete | 1.0 | 24 Jun 2019 |
| Implausible Pac-Man | S. K. Dumbbus | The Universe Soldiers | Action | NES | G, T, O | Complete | 1.1 | 04 Oct 2017 |
| Imperial Camp Dialogue Bugfix | DrakeyC | Final Fantasy III | Role Playing | SNES | T | Bug Fix | 1.2 | 01 Oct 2022 |
| Impact Wrestling | pacnsacdave | Pro Wrestling | Sports | NES | G, L, T, GP | Complete | 2.0 | 17 Sep 2019 |
| Imp's Retort | Leet Sketcher | Final Fantasy III | Role Playing | SNES | GP | Bug Fix | 1.5 | 29 Jan 2018 |
| Imp's Rage | Leet Sketcher | Final Fantasy III | Role Playing | SNES | GP | Bug Fix | 1.1 | 29 Jan 2018 |
| Imp's Call | Leet Sketcher | Final Fantasy III | Role Playing | SNES | GP | Bug Fix | 1.1 | 04 Feb 2018 |
| Imp Skimp | Leet Sketcher | Final Fantasy III | Role Playing | SNES | G | Bug Fix | 1.4 | 03 Mar 2017 |
| Imp 1.0 | Rootrick | Demon's Crest | Action > Platformer | SNES | G, T, GP | Improvement | 1.0 | 01 Jan 2021 |
| Immune Byte Bugfixes | Grimoire LD | Final Fantasy II | Role Playing | SNES | O | Bug Fix | 1.1 | 08 Dec 2014 |
| Immortal, The - no-dim hack | Cluster | The Immortal | Action Adventure | NES | O | Improvement | 1.0 | 23 Jun 2021 |
| Imitation Art | HatZen08 | Final Fantasy III | Role Playing | SNES | G | Improvement | 1.0 | 15 Mar 2013 |
| Imbued Magic | HatZen08 | Final Fantasy III | Role Playing | SNES | GP | Improvement | 1.1 | 16 Oct 2013 |
| Ikkyu | DASTARD | Ikki | Action > Shooter | NES | G | Improvement | 1.0 | 19 Sep 2009 |
| Ike Ike! Nekketsu Hockey Bu: VS Menu Hack | BalinDMK | Ike Ike! Nekketsu Hockey Bu: Subette Koronde Dairantou | Sports | NES | G, GP | Improvement | 3.0a | 01 Nov 2014 |
| Ike Ike! Nekketsu Hockey Bu: Team Hack | BalinDMK | Ike Ike! Nekketsu Hockey Bu: Subette Koronde Dairantou | Sports | NES | G, GP | Improvement | 33 | 14 Nov 2015 |
| Ike Ike! Nekketsu Hockey Bu Super hack | Pangyu | Ike Ike! Nekketsu Hockey Bu: Subette Koronde Dairantou | Sports | NES | G, L, T, GP | Complete | 2.0 | 03 Jun 2013 |
| Ike Ike! Nekketsu Hockey 16 teams | DANGER X | Ike Ike! Nekketsu Hockey Bu: Subette Koronde Dairantou | Sports | NES | G, L, GP | Complete | 40 | 29 Jan 2016 |
| Ikari Warriors Proofread | Mister Xiado | Ikari Warriors | Action > Shooter | NES | T | Improvement | 1.0 | 30 Jul 2018 |
| Ikari III MMC1 to MMC3 | chronix | Ikari III: The Rescue | Action > Beat 'Em Up | NES | O | Improvement | 1.0 | 15 Dec 2018 |
