| Crocomire Demo | Trunaur68 | Metroid: Zero Mission | Action > Platformer | GBA | GP | Complete | 1.0 | 07 Dec 2007 |
| Crocomire Hack | Trunaur68 | Metroid: Zero Mission | Action > Platformer | GBA | GP | Improvement | 0.9 | 07 Dec 2007 |
| Cross Fire De-Engrish Hack | Stardust Crusaders | Cross Fire | Action | NES | T | Bug Fix | 1.0 | 21 May 2009 |
| Crystal Beans - turhope mods | turhope | Crystal Beans from Dungeon Explorer | Role Playing > Action RPG | SNES | T, GP, O | Improvement | 2018-08-04 | 04 Aug 2018 |
| Crystalis - Sky Tower Exit | Red Mage Joe | Crystalis | Role Playing > Action RPG | NES | GP | Improvement | 0.1 | 10 Dec 2019 |
| Crystalis Audio Buzz Fix | Lonkelle | Crystalis | Role Playing > Action RPG | NES | S | Bug Fix | 1.0 | 09 Feb 2022 |
| Crystalis Computer Repair | Mister Xiado | Crystalis | Role Playing > Action RPG | NES | G | Improvement | 1.1 | 15 Nov 2018 |
| Crystalis Computer Repair (JP) | Red Mage Joe | Crystalis | Role Playing > Action RPG | NES | O | Improvement | 1.0 | 29 May 2019 |
| Crystalis Proofread | Mister Xiado | Crystalis | Role Playing > Action RPG | NES | T | Improvement | 1.0 | 14 Jul 2018 |
| Crystalis QOL & Ungrind | Mentil | Crystalis | Role Playing > Action RPG | NES | T, GP | Improvement | 1.01 | 01 Jan 2022 |
| Crystalis Rebalanced | Red X | Crystalis | Role Playing > Action RPG | NES | GP | Improvement | Final | 10 May 2012 |
| Crystalis Reduced Flashing | Miralupa | Crystalis | Role Playing > Action RPG | NES | G | Improvement | 1.0 | 23 Oct 2022 |
| Crystalis Refresh | LastduaL | Crystalis | Role Playing > Action RPG | NES | G | Improvement | 1.0 | 09 Aug 2017 |
| Crystalis Screen Shake Fix | Red Mage Joe | Crystalis | Role Playing > Action RPG | NES | G | Bug Fix | 1.0a | 22 Aug 2019 |
| CSTutor89's Adv Of Lolo 2 Hack | cstutor89 | Adventures of Lolo 2 | Puzzle | NES | G, L | Complete | 1.0 | 05 Sep 2010 |
| 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 |
