| CT: All Stat Tabs | phi | Chrono Trigger | Role Playing | SNES | GP | Improvement | 1.3 | 05 Apr 2021 |
| Cure Water Both Heals and Cures | Kethinov | Secret of Mana | Role Playing > Action RPG | SNES | GP | Improvement | 1.0 | 18 Oct 2019 |
| Cursed Tweak | Madsiur | Final Fantasy III | Role Playing | SNES | GP | Improvement | 1.1 | 28 Apr 2016 |
| Cursed: Legend of the Curse | Hanto | Super Mario RPG: Legend of the Seven Stars | Role Playing | SNES | L, T, GP, O | Complete | 1.0 | 22 Nov 2013 |
| Custom Classes Spellblade Fix | Chronosplit | Final Fantasy V Advance | Role Playing | GBA | GP | Addendum | 1.0 | 20 May 2016 |
| Custom Plumber Pack | eviemaybe | Super Mario Bros. | Action > Platformer | NES | G, T | Improvement | 1.0 | 03 Mar 2021 |
| Custom Robo Arena Redux | FMArthur | Custom Robo Arena | Role Playing > Action RPG | NDS | G, GP | Improvement | 1.0 | 08 Oct 2018 |
| Custom Tools | HatZen08 | Final Fantasy III | Role Playing | SNES | GP | Improvement | 1.0 | 11 Jun 2014 |
| Cute Zelda | Crabby Gabby | The Legend of Zelda | Action Adventure | NES | G, T | Improvement | 1.0 | 24 Feb 2001 |
| CV AOS: Future Alucard Hack | DarkPrinceAlucard | Castlevania: Aria of Sorrow | Role Playing > Action RPG | GBA | G, T, O | Improvement | 1.3 | 21 Oct 2016 |
| CV Dawn of Symphony (Alucard SOTN Hack) | DarkPrinceAlucard | Castlevania: Aria of Sorrow | Role Playing > Action RPG | GBA | G, S, T, O | Complete | 1.1 | 23 Mar 2017 |
| CVA Quick Fix | hiro1112 | Castlevania: The Adventure | Action > Platformer | GB | G, GP | Improvement | 1.0 | 22 Jun 2006 |
| CVLegends - Goodbye Pigtail | Chika Souko | Castlevania Legends | Action > Platformer | GB | G | Improvement | 1.1 | 06 Mar 2001 |
| CXSZELDA - Hyrule's Doom | The3Dude | The Legend of Zelda | Action Adventure | NES | G, L, T | Complete | 1.2 | 07 Jan 2017 |
| CyberTiger - Secret characters unlocked | gallaux | CyberTiger | Sports | N64 | GP | Improvement | 1.0 | 31 Dec 2022 |
| Cybie's Basics in Torture and Gibbing | Roebloz | DOOM | Action > Shooter | SNES | L, GP | Complete | 1.0 | 19 Sep 2022 |
| Da Hak | OmegaYoshi | Super Mario World | Action > Platformer | SNES | L, T, GP | Complete | 1.0 | 16 Jul 2016 |
| Da Hak 2 | OmegaYoshi | Super Mario World | Action > Platformer | SNES | L, T, GP | Complete | Final | 18 Jul 2016 |
| Dai-2-Ji Super Robot Taisen G Hack | Gigan | Dai-2-Ji Super Robot Taisen G | Strategy > Turn Based | GB | G, L, T | Improvement | 1.3 | 29 Jan 2023 |
| Dai-4-ji Super Robot Taisen - Touhou Atrangers | Gigan | Dai-4-Ji Super Robot Taisen | Strategy > Turn Based | SNES | G, L, T | Complete | 1.5 | 18 Feb 2022 |
