| 93' Optimized | AzStar | Contra | Action > Shooter | NES | G, L, GP | Complete | 1.41a | 17 Sep 2020 |
| Contra jump control | Evgeny | Contra | Action > Shooter | NES | GP | Improvement | 1.0 | 18 Sep 2020 |
| Contra: Easy Mode | iridium_ionizer | Contra | Action > Shooter | NES | GP | Improvement | 1.0 | 15 Feb 2021 |
| Contra III: The Alien Wars Restoration | SCD | Contra III: The Alien Wars | Action > Platformer | SNES | O | Improvement | Final | 29 Jun 2017 |
| Super Probotector: Alien Rebels Code Restoration | RealGaea | Contra III: The Alien Wars | Action > Platformer | SNES | O | Improvement | 1.0 | 30 Jun 2017 |
| Contra III Slowdown Removal | Vitor Vilela | Contra III: The Alien Wars | Action > Platformer | SNES | GP | Improvement | 1.3 | 05 Oct 2019 |
| Contra: Hard Corps Enhancement Hack | Jon Najar | Contra: Hard Corps | Action > Platformer | GEN | T, O | Improvement | Super Cham | 27 May 2012 |
| Contra Hard Corps Hit Points Restoration Hack | MrNemesis | Contra: Hard Corps | Action > Platformer | GEN | GP | Improvement | 1.0 | 22 Aug 2011 |
| Probotector (E) Hit Point Restoration Hack | MrNemesis | Contra: Hard Corps | Action > Platformer | GEN | GP | Improvement | 1.0 | 22 Aug 2011 |
| Contra: Hard Corps - INVASION v3.3 | IT.GAMER | Contra: Hard Corps | Action > Platformer | GEN | G, S, L, T, GP, O | Improvement | 3.3 | 02 Oct 2020 |
| Contra Hard Corps: Stationary Fire+ | DUSTINODELLOFFICIAL | Contra: Hard Corps | Action > Platformer | GEN | GP | Improvement | 1.0 | 04 Sep 2019 |
| Cooly Skunk (PAL Region Fix) | Ice Man | Cooly Skunk | Action > Platformer | SNES | O | Improvement | 1.0 | 11 Oct 2020 |
| Crack Down Arcade colors | fabio | Crack Down | Action > Shooter | GEN | G | Improvement | 1.0 | 02 May 2020 |
| 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 Rebalanced | Red X | Crystalis | Role Playing > Action RPG | NES | GP | Improvement | Final | 10 May 2012 |
| Crystalis Refresh | LastduaL | Crystalis | Role Playing > Action RPG | NES | G | Improvement | 1.0 | 09 Aug 2017 |
| Crystalis Proofread | Mister Xiado | Crystalis | Role Playing > Action RPG | NES | T | Improvement | 1.0 | 14 Jul 2018 |
| 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 | G | Addendum | 1.0 | 29 May 2019 |
