| Twin Cobra/Kyuukyoku Tiger Arcade tiles/sprites/colors | fusaru | Twin Cobra | Action > Shooter | GEN | G | Improvement | 2.00 | 14 Jul 2016 |
| Turtles on Turtle Shell Isle | Kethinov | Secret of Mana | Role Playing > Action RPG | SNES | GP | Improvement | 1.0 | 25 Oct 2019 |
| Turtle Soup Mod | Maror | Teenage Mutant Ninja Turtles II: The Arcade Game | Action > Beat 'Em Up | NES | GP | Complete | 1.0 | 24 Dec 2013 |
| Turrican Fixed | Linkuei | Turrican | Action > Platformer | GEN | G, GP | Bug Fix | 1.5 | 06 Sep 2015 |
| Turrican - health fix and unlimited continue | NinjAkira | Turrican | Action > Platformer | GEN | GP | Improvement | 1.0 | 01 Jun 2019 |
| Turn Around | Leet Sketcher | Final Fantasy III | Role Playing | SNES | G, L | Bug Fix | 1.0 | 17 May 2016 |
| Turma da Mônica na Terra dos Monstros (Wonder Boy in Monster World) Improvement | Anime_World | Wonder Boy in Monster World | Action > Platformer | GEN | G, T, O | Improvement | 1.1 | 14 May 2018 |
| Turbo Outrun Enhanced Colors | Dolsilwa | Turbo Outrun | Racing | GEN | G | Improvement | 1.0 | 02 May 2020 |
| Truxton/Tatsujin Arcade colors/sprites/backgrounds | fusaru | Truxton | Action > Shooter | GEN | G | Improvement | 1.00 | 27 Mar 2016 |
| True Duel | HatZen08 | Final Fantasy III | Role Playing | SNES | GP | Improvement | 1.0 | 03 Jan 2013 |
| True Color Mothra | CharMish | Godzilla: Monster of Monsters! | Action | NES | G | Bug Fix | 1.0 | 07 May 2019 |
| Trojan UNROM to MMC3 | BZK | Trojan | Action > Platformer | NES | O | Improvement | 001 | 11 Oct 2016 |
| Trog! NES - Fair PvP hack | nattou | Trog! | Action | NES | GP | Improvement | 1.0 | 24 Mar 2020 |
| Trog Famicom 2P | nattou | Trog! | Action | NES | O | Improvement | 1.0 | 10 Mar 2020 |
| Tritoch Animation Fix | bydoless | Final Fantasy III | Role Playing | SNES | G | Bug Fix | 1.0 | 19 Oct 2016 |
| Tritoch Animation Fix | bydoless | Final Fantasy VI Advance | Role Playing | GBA | G | Bug Fix | 1.0 | 02 Nov 2016 |
| Trip World Casual Mode | llakssz | Trip World | Action > Platformer | GB | G, GP, O | Improvement | 1.0 | 03 Oct 2019 |
| Trigger Happy | Leet Sketcher | Final Fantasy III | Role Playing | SNES | L | Bug Fix | 1.0 | 31 Jul 2017 |
| Tricky Mario Neo | Ultimesiah | Super Mario Bros. | Action > Platformer | NES | G, L, T | Complete | 1.0 | 01 Jan 2005 |
| Tricked Out from the Start | Kethinov | Secret of Mana | Role Playing > Action RPG | SNES | GP | Improvement | 1.0 | 02 Apr 2019 |
