| Xenosaga Episode III Uncensored Patch | Phoenix_NewMoon | Xenosaga Episode III: Also sprach Zarathustra | Role Playing | PS2 | G, S, L | Improvement | 1.0 | 05 Jan 2023 |
| Xevious Alternate | Makimura Manufacturing | Xevious | Action > Shooter | NES | G, O | Improvement | 2.0.1 | 07 Jul 2012 |
| Xevious Hard Mode hack | Guyver (X.B.M.) | Xevious | Action > Shooter | NES | GP | Complete | 1.0 | 20 Sep 2021 |
| Xexyz - SRAM Saving Edition | 8-bit fan | Xexyz | Action > Platformer | NES | T, O | Improvement | 1.0 | 12 Jan 2018 |
| Xiao Ma Li palette fix | Guyver (X.B.M.) | Xiao Ma Li | Other | NES | G | Bug Fix | 1.0 | 17 Oct 2016 |
| Xtra Promo Super Mario Bros | S. K. Dumbbus | Super Mario Bros. | Action > Platformer | NES | G, L, T | Complete | 1.0 | 07 Jul 2007 |
| XXXX | 79 | Super Mario Bros. | Action > Platformer | NES | G, S, L, T | Complete | 1.0 | 15 Oct 2003 |
| Y Equip Relics | Leet Sketcher | Final Fantasy III | Role Playing | SNES | O | Improvement | 1.2 | 19 Dec 2016 |
| Yamame | DASTARD | Dig Dug | Action | NES | G, T | Improvement | 1.0 | 01 Jun 2008 |
| Yami Yugi with summons playable in Castlevania:Dawn of Sorrow | Shametal | Castlevania: Dawn of Sorrow | Role Playing > Action RPG | NDS | G, S, T, GP | Complete | 1.0 | 04 Mar 2023 |
| YASH - Yet Another SMB Hack | Jp32 | Super Mario Bros. | Action > Platformer | NES | G, L, T, GP | Complete | 1.5 | 21 Mar 2014 |
| Yellow Toad | Turtlar | Super Mario Bros. | Action > Platformer | NES | G | Improvement | 1.0 | 12 Mar 2023 |
| Yet Another SMW Hack | Jp32 | Super Mario World | Action > Platformer | SNES | G, S, L, T | Complete | 1.0 | 30 Jul 2017 |
| Yie Ar Kung-Fu control hack | Guyver (X.B.M.) | Yie Ar Kung-Fu | Action > Fighting | NES | GP | Improvement | 1.0 | 19 Sep 2021 |
| YoonA: The Raid of the Black Girls' Generation | w7n | Super Mario Bros. | Action > Platformer | NES | G, S, L, T | Complete | 1.01 | 07 Aug 2011 |
| Yoshi LDX | amaturehr | Yoshi | Puzzle | GB | G, S | Improvement | 1.0 | 22 Feb 2023 |
| Yoshi's Cookie Title Screen Hack | Q | Yoshi's Cookie | Puzzle | SNES | G, O | Improvement | 1.0 | 08 Nov 2018 |
| Yoshi's Island (SMA 3) Colour Restoration | ShadowOne333 | Yoshi's Island: Super Mario Advance 3 | Action > Platformer | GBA | G, O | Improvement | 2.0 | 19 Oct 2015 |
| Yoshi's Island - Kamek's Revenge | S.N.N. | Super Mario World 2: Yoshi’s Island | Action > Platformer | SNES | G, S, L, T, O | Complete | 1.0 | 30 Sep 2007 |
| Yoshi's Island - No Crying, Improved SFX and Red Coins | Trisma | Super Mario World 2: Yoshi’s Island | Action > Platformer | SNES | G, S | Improvement | 1.0 | 30 Mar 2018 |
