| Guardian Legend Secret Edition | Optomon | The Guardian Legend | Action > Shooter | NES | L, T, GP | Complete | 3.3 | 20 Mar 2010 |
| Guardian Legend - SRAM Saving Edition | 8-bit fan | The Guardian Legend | Action > Shooter | NES | T, O | Improvement | 1.0 | 10 Nov 2017 |
| Grump's Dream Course | MowseChao | Kirby's Dream Course | Sports | SNES | G, S, L, T | Complete | 1.01 | 31 Aug 2016 |
| Green Dizzy | Berion | The Fantastic Adventures of Dizzy | Action Adventure | NES | G, L, T | Complete | 1.1 | 26 Jun 2008 |
| Green Beret (NES) | Kozakurainko | Rush'n Attack | Action > Platformer | NES | G | Improvement | 1.0 | 21 Feb 2006 |
| Grave of the Fireflies (Adventure Island NES Hack) | Supergamerguy | Adventure Island | Action > Platformer | NES | G, T | Complete | 0.99 | 11 Mar 2021 |
| Graros - Seicross to Gradius Conversion | ZZZ+Kaison | Seicross | Action > Shooter | NES | G | Improvement | 1.0 | 29 Apr 2002 |
| Grandoplex Shooter | HarvettFox96 | Hogan's Alley | Action > Shooter | NES | G, T | Complete | 1.1.0 | 25 Mar 2014 |
| Grandma Got Ran Over By a Reindeer | Megafield64 | Super Mario Bros. | Action > Platformer | NES | G | Complete | 12.25 | 20 Dec 2013 |
| Grandia Voices & Video cutscenes Undub NTSC-U English | Etsuna | Grandia | Role Playing | PSX | S, O | Improvement | 2.0 | 03 Aug 2018 |
| Grandia Voices & Video cutscenes Undub German | Etsuna | Grandia | Role Playing | PSX | S, O | Improvement | 1.0 | 24 May 2018 |
| Grandia Voices & Video cutscenes Undub French | Etsuna | Grandia | Role Playing | PSX | S, O | Improvement | 2.0 | 29 May 2018 |
| Grand Theft Auto: London 1969 - Standalone Patch | MrMario2011 | Grand Theft Auto: The Director's Cut | Action Adventure | PSX | O | Improvement | 2.0 | 07 Dec 2019 |
| Grand Dad Overthrows Bowser | Googie | Super Mario Bros. | Action > Platformer | NES | G, S, L, T, GP, O | Complete | 1.0 | 12 Nov 2020 |
| Gradius Resurrection | Evgeny | Gradius | Action > Shooter | NES | GP | Improvement | 4 | 03 Jul 2020 |
| Gradius II - no upgrade loss | Her-Saki | Gradius II | Action > Shooter | NES | GP | Improvement | 1.0 | 03 Mar 2018 |
| Gradius II - Arrangement Chronicle Death | Messatu | Gradius II | Action > Shooter | NES | G, O | Complete | 2.0 | 23 Jun 2018 |
| Gradius AC 2000 | Kasion | Gradius | Action > Shooter | NES | G, S, GP | Improvement | 1.0 | 13 Apr 2000 |
| Gradius 2 Enhancements | FRS | Gradius 2 | Action > Shooter | MSX | O | Improvement | 1.0 | 04 Apr 2009 |
| Gradius - MSX Conversion (Twinbee Version) | Messatu | Gradius | Action > Shooter | NES | G | Improvement | 1.0 | 17 Jul 2012 |
