| Gaia Blade | Xbox | RPG | To Be Announced |
| Galleon | Xbox | Action/Adventure | 8/3/2004 |
| Game Developer Conference 2004 | Xbox | Other | Cancelled |
| Gauntlet Dark Legacy | Xbox | Action | 4/23/2002 |
| Gauntlet: Seven Sorrows | Xbox | Action/Adventure | 12/12/2005 |
| Gene Troopers | Xbox | First Person Shooter | To Be Announced |
| Genma Onimusha | Xbox | Action/Adventure | 2/15/2002 |
| Ghost Master | Xbox | Action/Adventure | Cancelled |
| Gladiator: Sword of Vengeance | Xbox | Action | 11/4/2003 |
| Gladius | Xbox | Action/RPG | 10/28/2003 |
| Goblin Commander: Unleash the Horde | Xbox | Real Time Strategy | 11/11/2003 |
| Goblin Quest | Xbox | Adventure | Cancelled |
| Godzilla: Destroy All Monsters Melee | Xbox | Fighting | 4/16/2003 |
| Godzilla: Save the Earth | Xbox | Action/Adventure | 11/9/2004 |
| GoldenEye: Rogue Agent | Xbox | First Person Shooter | 11/22/2004 |
| Grabbed by the Ghoulies | Xbox | Action/Adventure | 10/28/2003 |
| Grand Theft Auto Double Pack | Xbox | Action/Adventure | 11/4/2003 |
| Grand Theft Auto: San Andreas | Xbox | Action/Adventure | 6/6/2005 |
| Gravity Games Bike | Xbox | Extreme Sports | 9/24/2002 |
| Greg Hastings' Tournament Paintball | Xbox | First Person Shooter | 11/16/2004 |
| Greg Hastings’ Tournament Paintball MAX’D | Xbox | First Person Shooter | 10/18/2005 |
| Grooverider Slot Car Thunder | Xbox | Racing/Driving | 10/1/2003 |
| Group S Challenge | Xbox | Racing/Driving | 9/23/2003 |
| Guilty Gear X2 #Reload | Xbox | Fighting | 9/14/2004 |
| Gumshoe | Xbox | Action | Cancelled |
| GUN | Xbox | Action/Shooter | 11/8/2005 |
| Gun Metal | Xbox | Action | 8/1/2002 |
| GunGriffon: Allied Strike | Xbox | Action/Shooter | 12/14/2004 |
| Gunvalkyrie | Xbox | Action | 3/30/2002 |