| PC/MS-Windows CD |  Greece Roma Sinhwa: Sinhwa-eui Jewang - Zeus vs Chronos | 2003 | OrangesofT Korea |
| Nintendo GBA cart. | Green Eggs and Ham by Dr. Seuss Model AGB-BUSE-USA | 2003 | NewKidCo International, Inc. |
| PC/MS-Windows CD | Grom | 2003 | CDV Soft. Ent. USA, Inc. |
| Nintendo GameCube disc | GrooveRider - Slot Car Thunder Model DOL-GVRE-USA | 2003 | Encore Soft., Inc. |
| LeapFrog Leapster cart. | Grundschule 1 | 2003 | LeapFrog |
| LeapFrog Leapster cart. | Grundschule 2 - Musik in Gefahr | 2003 | LeapFrog |
| Redemption mechanical game | GSA - Go Stop Area Gift | 2003 | Unknown Korea |
| Nintendo GBA cart. |  GT Advance 3 - Pro Concept Racing Model AGB-A2GE-USA | 2003 | T-HQ, Inc. Toy HeadQuarters |
| Nintendo GBA cart. | GT Advance 3 - Pro Concept Racing Model AGB-A2GP | 2003 | T-HQ, Inc. Toy HeadQuarters |
| Nintendo GameCube disc | GT Cube | 2003 | MTO, Inc. Japan |
| Sammy Atomiswave cart. | Guilty Gear X Version 1.5 | 2003 | Sammy Corp. Japan |
| Sega NAOMI GD-ROM | Guilty Gear XX #Reload Model GDL-0019 | 2003 | Sammy Corp. Japan |
| Konami System 573 disc+cart. | GuitarFreaks 10thMix | 2003 | Konami Corp. Japan |
| Konami System 573 disc+cart. | GuitarFreaks 9thMix Model GCD10 | 2003 | Konami Corp. Japan |
| PC/MS-Windows CD | Gun Metal | 2003 | Zoo Digital Publishing |
| Pachislot | Gunton | 2003 | Yama Japan |
| MSX cart. | Guru Logic Hb | 2003 | Karoshi Corp. |
| Pachislot | Gurukun | 2003 | Abilit Japan |
| PC MS-Windows/Macintosh CD | Gyaku Shaun Sai Hanri | 2003 | Cheshire |
| Pachinko | Gyaoh! Model FX | 2003 | Maruhon Japan |
| Pachinko | Gyaoh! Model HF14 | 2003 | Maruhon Japan |
| Pachinko | Gyaoh! Model HFX | 2003 | Maruhon Japan |
| Pachinko | Gyaoh! Model MX | 2003 | Maruhon Japan |
| Pachinko | Gyaoh! Model M | 2003 | Maruhon Japan |
| Nintendo GBA cart. | Hachiemon Model AGB-A8EJ-JPN | 2003 | NAMCO, Ltd. Japan |
| PC/MS-Windows CD | Haegemonia - The Solon Heritage | 2003 | Wanadoo Edition |
| PC/MS-Windows CD | Haesang-wang Jang Bogo | 2003 | JoyOn Korea |
| PC/MS-Windows pack. | Half-Life - Blue Shift Model 130 | 2003 | Steam Valve Corp. |
| PC/MS-Windows pack. | Half-Life - Opposing Force Model 50 | 2003 | Steam Valve Corp. |
| PC/MS-Windows pack. | Half-Life Model 70 | 2003 | Steam Valve Corp. |
| PC/MS-Windows CD | Halo - Combat Evolved | 2003 | Microsoft |
| Nintendo GBA cart. | Hamster Club 4 Model AGB-A4KJ-JPN | 2003 | Jorudan Co., Ltd. Japan |
| Nintendo GBA cart. | Hamster Monogatari 3EX, 4, Special Model AGB-BHSJ-JPN | 2003 | Culture Brain |
| Nintendo GBA cart. | Hamster Monogatari Collection Model AGB-BHCJ-JPN | 2003 | Culture Brain |
| Sony PlayStation CD |  Hamster Monogatari Model SLPS-03527 | 2003 | Culture Brain |
| Nintendo GBA cart. | Hamster Paradise - Pure Heart Model AGB-A82J-JPN | 2003 | Atlus Co., Ltd. Japan |
| Nintendo GBA cart. | Hamtaro - Ham-Ham Heartbreak Model AGB-AH3E-USA | 2003 | Nintendo of America, Inc. USA 45496 |
| Nintendo GBA cart. | Hamtaro - Ham-Ham Heartbreak Model AGB-AH3P | 2003 | Nintendo Co., Ltd. Japan |
| Nintendo Game Boy Color cart. | Hamtaro - Ham-Hams Unite! Model CGB-B86P-EUR | 2003 | Nintendo Co., Ltd. Japan |
| Nintendo GBA cart. | Hamtaro - Rainbow Rescue Model AGB-A84P | 2003 | Nintendo Co., Ltd. Japan |
