| Arc Hound | chronix | Contra Force | Action > Shooter | NES | G | Improvement | 1.0 | 07 Aug 2022 |
| Contra III Slowdown Removal | Vitor Vilela | Contra III: The Alien Wars | Action > Platformer | SNES | GP | Improvement | 1.3 | 05 Oct 2019 |
| Contra III: The Alien Wars FastROM | MaxwelOlinda | Contra III: The Alien Wars | Action > Platformer | SNES | O | Improvement | 1.0 | 15 Nov 2021 |
| Super Probotector: Alien Rebels Code Restoration | RealGaea | Contra III: The Alien Wars | Action > Platformer | SNES | O | Improvement | 1.0 | 30 Jun 2017 |
| Contra III: The Alien Wars Restoration | SCD | Contra III: The Alien Wars | Action > Platformer | SNES | O | Improvement | Final | 29 Jun 2017 |
| 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 |
| Contra Hard Corps Hit Points Restoration Hack | MrNemesis | Contra: Hard Corps | Action > Platformer | GEN | GP | Improvement | 1.0 | 22 Aug 2011 |
| CONTRA HARD CORPS PROBOTECTOR | IT.GAMER | Contra: Hard Corps | Action > Platformer | GEN | G, GP | Complete | 1.1b | 06 Jan 2022 |
| Probotector (E) Hit Point Restoration Hack | MrNemesis | Contra: Hard Corps | Action > Platformer | GEN | GP | Improvement | 1.0 | 22 Aug 2011 |
| Contra - Hard Corps SRAM | BillyTime! Games | Contra: Hard Corps | Action > Platformer | GEN | O | Improvement | 2.0 | 12 Jun 2021 |
| Contra: Hard Corps Enhancement Hack | Jon Najar | Contra: Hard Corps | Action > Platformer | GEN | T, O | Improvement | Super Cham | 27 May 2012 |
| Cooly Skunk (PAL Region Fix) | Ice Man | Cooly Skunk | Action > Platformer | SNES | O | Improvement | 1.0 | 11 Oct 2020 |
| Cooly Skunk Enable Password Hack | denim | Cooly Skunk | Action > Platformer | SNES | O | Improvement | 1.1 | 27 Mar 2022 |
| Crack Down Arcade colors | fabio | Crack Down | Action > Shooter | GEN | G | Improvement | 1.0 | 02 May 2020 |
| Nazo no Kabe: Block Kuzushi (NES) | Kozakurainko | Crackout | Action | NES | G | Improvement | 1.0 | 21 Feb 2006 |
| 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 Computer Repair (JP) | Red Mage Joe | Crystalis | Role Playing > Action RPG | NES | O | Improvement | 1.0 | 29 May 2019 |
