| Hard Mode Items in Normal Mode + Palette | Androo_ | Castlevania: Aria of Sorrow | Role Playing > Action RPG | GBA | G, T, GP | Improvement | 1.3 | 08 Jan 2020 |
| Hard Mode of Contra | AzStar | Contra | Action > Shooter | NES | G, L, T | Complete | 2.2 | 02 Dec 2019 |
| Hardcore Tetris | PKMNwww411 | Tetris | Puzzle | GB | G, O | Improvement | Various | 06 Jan 2017 |
| Harder Final Boss | Kethinov | Secret of Mana | Role Playing > Action RPG | SNES | GP | Improvement | 1.4 | 01 Jan 2020 |
| Harder Quest | Zenopathy | The Legend of Zelda: Ocarina of Time | Action Adventure | N64 | T, GP, O | Improvement | 1.0 | 17 May 2022 |
| Harder Vanilla ft. More Doors | Luminatron | Castlevania: Aria of Sorrow | Role Playing > Action RPG | GBA | T, GP | Improvement | 0.96 | 02 Jan 2023 |
| Harmony of Dissonance - Localisation Fix | spiffy | Castlevania: Harmony of Dissonance | Role Playing > Action RPG | GBA | T | Improvement | 1.02 | 23 Jan 2018 |
| Harmony of Dissonance Dialogue Update | caminopreacher | Castlevania: Harmony of Dissonance | Role Playing > Action RPG | GBA | G, T | Improvement | 1.0 | 15 Apr 2019 |
| Harvest Moon - Increased Day time | mattdog1000000 | Harvest Moon | Simulation | SNES | GP | Addendum | 1.0 | 07 Apr 2022 |
| Harvest Moon - Intuitive Ranch Master | mattdog1000000 | Harvest Moon | Simulation | SNES | GP, O | Improvement | 2.5.1 | 02 Oct 2022 |
| Harvest Moon DS Cute - Pete Version | unx | Harvest Moon DS Cute | Simulation | NDS | G | Improvement | 1.0 | 23 Dec 2017 |
| Harvest Moon DS: Claire & Jill Version | unx | Harvest Moon DS | Simulation | NDS | G | Improvement | 1.0 | 17 Dec 2017 |
| Harvest Moon: A Proud Life | seangibbz | Harvest Moon: A Wonderful Life | Role Playing | GC | G, T, GP | Improvement | 1.0 | 12 Oct 2019 |
| Harvett Fox in the Mushroom Kingdom | HarvettFox96 | Super Mario Bros. | Action > Platformer | NES | G, T, GP, O | Improvement | 20200101.1 | 31 Dec 2019 |
| Hassle | Inventor | Front Line | Action > Shooter | NES | G | Improvement | 1.0 | 01 Jan 2001 |
| Hasty T-Rex | Leet Sketcher | Final Fantasy III | Role Playing | SNES | G | Bug Fix | 1.2 | 30 Jan 2018 |
| Havoc in Streets of Rage 2 | Metal64 | Streets of Rage 2 | Action > Beat 'Em Up | GEN | O | Improvement | 1.1 | 15 Oct 2017 |
| Haxor's Grocery Run | Jabem | Super Mario Bros. 3 | Action > Platformer | NES | G, L, GP | Improvement | 2.0 | 16 Jun 2020 |
| He Lucathicc's Bouncing Blitzkrieg | KK Hell | Mappy | Action > Platformer | NES | G | Improvement | v2 | 19 Dec 2022 |
| Heart of Chaos | radzo73 | Castlevania: Aria of Sorrow | Role Playing > Action RPG | GBA | S | Improvement | 1.0 | 22 Sep 2020 |
