| G-LOC - Air Battle | BR | 1991 |
Sega Enterprises | Commercial |
| G-LOC - Air Battle | EU | 1992-01 |
Sega Enterprises | Commercial |
| GLUF Tesla Frog | WORLD | 2026-03 |
SMS Power! | Unlicensed |
| GP Rider | BR | 1993 |
Sega Enterprises | Commercial |
| GP Rider | EU | 1993 |
Sega Enterprises | Commercial |
| Gaegujangi Kkachi | KR | 1993-08 |
HiCom | Unlicensed |
| Gain Ground | BR | 1990 |
Sega Enterprises | Commercial |
| Gain Ground | BR | 1990 |
Sega Enterprises | Prototype |
| Gain Ground | EU | 1991-01 |
Sega Enterprises | Commercial |
| Gain Ground | EU | 1991-01 |
Sega Enterprises | Prototype |
| Galactic Protector | JP | 1988-02-21 |
Sega Enterprises | Commercial |
| Galactic Revenge | WORLD | 2018-03 |
| Unlicensed |
| Galaxian | KR | |
HiCom | Unlicensed |
| Galaxy Force | BR | 1989-10 |
Sega | Commercial |
| Galaxy Force | EU | 1989-10 |
Sega | Commercial |
| Galaxy Force | US | 1989-10 |
Sega | Commercial |
| Game Box Serie Esportes Radicais | BR | 1989 |
Tec Toy | Commercial |
| Game Chongjiphap 200 | KR | |
| Unlicensed |
| Game Mo-eumjip 188 Hap | KR | |
| Unlicensed |
| Game de Check! Koutsuu Anzen | JP | 1987 |
Tokio Marine | Prototype |
| Gangcheol RoboCop | KR | 1992 |
Sieco | Unlicensed |
| Gangster Town | BR | 1987-08 |
Sega of America | Commercial |
| Gangster Town | EU | 1987-08 |
Sega of America | Commercial |
| Gangster Town | US | 1987-08 |
Sega of America | Commercial |
| Garbagefield Saves Christmas | WORLD | |
| Unlicensed |
| Gaudream | WORLD | |
| Prototype |
| Gauntlet | BR | 1990-11 |
U.S. Gold | Commercial |
| Gauntlet | EU | 1990-11 |
U.S. Gold | Commercial |
| Gekioko PunPun Maru | WORLD | 2013-12 |
Future Driver | Prototype |
| Gemitas | WORLD | 2018-03 |
Cyttorak | Unlicensed |
| Geometry Blaster | WORLD | |
| Prototype |
| George Foreman's KO Boxing | BR | 1992 |
Flying Edge | Commercial |
| George Foreman's KO Boxing | EU | 1992 |
Flying Edge | Commercial |
| Geraldinho | BR | 1994 |
Tec Toy | Commercial |
| Ghost House | BR | 1986-04 |
Sega of America | Commercial |
| Ghost House | BR | 1986-04 |
Sega of America | Prototype |
| Ghost House | EU | 1987-08 |
Sega of America | Commercial |
| Ghost House | EU | 1987-08 |
Sega of America | Prototype |
| Ghost House | JP | 1986-04-21 |
Sega of America | Commercial |
| Ghost House | US | 1986-09 |
Sega of America | Commercial |
| Ghost House | US | 1986-09 |
Sega of America | Prototype |
| Ghostbusters | BR | 1989 |
Sega of America | Commercial |
| Ghostbusters | EU | 1989-10 |
Sega of America | Commercial |
| Ghostbusters | US | 1987-05 |
Sega of America | Commercial |
| Ghouls'n Ghosts | BR | 1988 |
Sega of America | Commercial |
| Ghouls'n Ghosts | EU | 1991-04 |
Sega of America | Commercial |
| Ghouls'n Ghosts | US | 1991-01 |
Sega of America | Commercial |
| Global Defense | BR | 1987-10 |
Sega of America | Commercial |
| Global Defense | BR | 1987-10 |
Sega of America | Prototype |
| Global Defense | EU | 1988-03 |
Sega of America | Commercial |
| Global Defense | EU | 1988-03 |
Sega of America | Prototype |
| Global Defense | US | 1988-03 |
Sega of America | Commercial |
| Global Defense | US | 1988-03 |
Sega of America | Prototype |
| Global Gladiators | BR | 1993-04 |
Virgin | Commercial |
| Global Gladiators | EU | 1993-04 |
Virgin | Commercial |
| Goblin Kart Rescue | WORLD | 2024-05 |
raphnet | Unlicensed |
| Gokuaku Doumei Dump Matsumoto | JP | 1986-07-20 |
Sega | Commercial |
| Golden Axe | BR | 1989 |
Sega of America | Commercial |
| Golden Axe | EU | 1990-03 |
Sega of America | Commercial |
| Golden Axe | US | 1990-03 |
Sega of America | Commercial |
| Golden Axe Warrior | BR | 1991-04 |
Sega of America | Commercial |
| Golden Axe Warrior | EU | 1991-05 |
Sega of America | Commercial |
| Golden Axe Warrior | US | 1991-04 |
Sega of America | Commercial |
| Golfamania | BR | 1990 |
Sega Enterprises | Commercial |
| Golfamania | BR | 1990 |
Sega Enterprises | Prototype |
| Golfamania | EU | 1990 |
Sega Enterprises | Commercial |
| Golfamania | EU | 1990 |
Sega Enterprises | Prototype |
| Golvellius - Valley of Doom | BR | 1988-08 |
Sega Enterprises | Commercial |
| Golvellius - Valley of Doom | EU | 1988-08 |
Sega Enterprises | Commercial |
| Golvellius - Valley of Doom | US | 1988-12 |
Sega Enterprises | Commercial |
| Gommy - Medieval Defender | WORLD | |
| Unlicensed |
| Goodzilla | WORLD | |
| Unlicensed |
| Gotris | WORLD | |
| Prototype |
| Gotris | WORLD | |
| Unlicensed |
| Grail of the Gods | WORLD | |
| Unlicensed |
| Gravity Beam - Master Gaiden | WORLD | |
| Unlicensed |
| Grazers | WORLD | |
| Prototype |
| Great Baseball | EU | 1987-03 |
Sega Enterprises | Commercial |
| Great Baseball | JP | 1985-12-15 |
Sega Enterprises | Commercial |
| Great Baseball | US | 1987-03 |
Sega Enterprises | Commercial |
| Great Basketball | WORLD | 1987-03-29 |
Sega of America | Commercial |
| Great Football | WORLD | 1987-04-29 |
Sega of America | Commercial |
| Great Golf | JP | 1986-12-20 |
Sega of America | Commercial |
| Great Golf | KR | 1987-10 |
Sega of America | Unlicensed |
| Great Golf | WORLD | 1986-12-20 |
Sega of America | Prototype |
| Great Golf | WORLD | 1987-10 |
Sega of America | Commercial |
| Great Ice Hockey | JP | 1987 |
Sega of America | Commercial |
| Great Ice Hockey | US | 1986-12 |
Sega of America | Commercial |
| Great Soccer | EU | 1985-10 |
Sega Enterprises | Commercial |
| Great Soccer | JP | 1985-10-27 |
Sega Enterprises | Commercial |
| Great Soccer | TW | 1985-10 |
Sega Enterprises | Unlicensed |
| Great Tennis | JP | 1985-12-22 |
Sega of America | Commercial |
| Great Volleyball | BR | 1987-03 |
Sega of America | Commercial |
| Great Volleyball | EU | 1987-03 |
Sega of America | Commercial |
| Great Volleyball | JP | 1987-03-29 |
Sega of America | Commercial |
| Great Volleyball | US | 1987-08 |
Sega of America | Commercial |
| Green Beret | WORLD | 2022-03 |
SMS Power! | Unlicensed |
| Grime Z80 | WORLD | |
| Unlicensed |
| Gun.Smoke | KR | 1990 |
Prosoft | Unlicensed |
| Guntus | WORLD | |
| Unlicensed |