| Sony PlayStation 2 disc |  Official PlayStation 2 Magazine Demo 49 Model SCED-52164 | 2004 | Future Publishing, Ltd. UK |
| Sony PlayStation 2 disc | Official PlayStation 2 Magazine Demo 49 Model SCED-52728 | 2004 | Future Publishing, Ltd. UK |
| Sony PlayStation 2 disc | Official PlayStation 2 Magazine Demo 50 Model SCED-52090 | 2004 | Future Publishing, Ltd. UK |
| Sony PlayStation 2 disc | Official PlayStation 2 Magazine Demo 50 Model SCED-52165 | 2004 | Future Publishing, Ltd. UK |
| Sony PlayStation 2 disc | Official PlayStation 2 Magazine Demo 50 Model SCED-52785 | 2004 | Future Publishing, Ltd. UK |
| Sony PlayStation 2 disc | Official PlayStation 2 Magazine Demo 50 Model SCED-52796 | 2004 | Future Publishing, Ltd. UK |
| Sony PlayStation 2 disc | Official PlayStation 2 Magazine Demo 50 Model SCED-52855 | 2004 | Future Publishing, Ltd. UK |
| Sony PlayStation 2 disc | Official PlayStation 2 Magazine Demo 51 Model SCED-52091 | 2004 | Future Publishing, Ltd. UK |
| Sony PlayStation 2 disc | Official PlayStation 2 Magazine Demo 51 Model SCED-52166 | 2004 | Future Publishing, Ltd. UK |
| Sony PlayStation 2 disc | Official PlayStation 2 Magazine Demo 51 Model SCED-52786 | 2004 | Future Publishing, Ltd. UK |
| Sony PlayStation 2 disc | Official PlayStation 2 Magazine Demo 52 Model SCED-52092 | 2004 | Future Publishing, Ltd. UK |
| Sony PlayStation 2 disc | Official PlayStation 2 Magazine Demo 52 Model SCED-52167 | 2004 | Future Publishing, Ltd. UK |
| Sony PlayStation 2 disc | Official PlayStation 2 Magazine Demo 52 Model SCED-52938 | 2004 | Future Publishing, Ltd. UK |
| Sony PlayStation 2 disc | Official PlayStation 2 Magazine Demo 52 Model SCED-52981 | 2004 | Future Publishing, Ltd. UK |
| Sony PlayStation 2 disc | Official PlayStation 2 Magazine Demo 53 Model SCED-52080 | 2004 | Future Publishing, Ltd. UK |
| Sony PlayStation 2 disc | Official PlayStation 2 Magazine Demo 53 Model SCED-52168 | 2004 | Future Publishing, Ltd. UK |
| Sony PlayStation 2 disc | Official PlayStation 2 Magazine Demo 53 Model SCED-52990 | 2004 | Future Publishing, Ltd. UK |
| Sony PlayStation 2 disc | Official PlayStation 2 Magazine Demo 53 Model SCED-52991 | 2004 | Future Publishing, Ltd. UK |
| Sony PlayStation 2 disc | Official PlayStation 2 Magazine Germany Special Edition 01-2004 | 2004 | Future Publishing, Ltd. UK |
| Sony PlayStation 2 disc | Official PlayStation 2 Magazine Sonderausgabe 03-2004 | 2004 | Future Publishing, Ltd. UK |
| Sony PlayStation 2 disc | Official PlayStation 2 Magazine Special Noel 2004 | 2004 | Future Publishing, Ltd. UK |
| Arcade Video game |  Ollie King | 2004 | SEGA Amusements Europe, Ltd. Chessington, England |
| Sony PlayStation CD | Omega Assault Model SLES-04051 | 2004 | Phoenix Games |
| Pachislot | Omigoto! Sabu-chan | 2004 | Olympia Co., Ltd. Japan |
| Pachislot | Omigoto! Sabu-chan Alt. Art | 2004 | Olympia Co., Ltd. Japan |
| Nintendo GBA cart. | One Piece - Going Baseball - Haejeok Yaku | 2004 | Bandai Co., Ltd. Japan |
| Nintendo GBA cart. | One Piece - Going Baseball - Kaizoku Yakyuu Model AGB-BO8J-JPN | 2004 | Bandai Co., Ltd. Japan |
| Dedicated Console | One Piece - Punch Battle | 2004 | Bandai Co., Ltd. Japan |
| Slot Machine | One Touch Bonanza | 2004 | IGT International Game Technologies Reno, NV, USA |
| Slot Machine | One, Two, Three Fortune | 2004 | IGT International Game Technologies Reno, NV, USA |
| PC/MS-Windows CD | Onedarimilk Princess | 2004 | Ignition Ent., Ltd. |
| Sony PlayStation 2 disc |  Onimusha 3 - Demon Siege Model SLUS-20694 | 2004 | Capcom Ent., Inc. USA 13388 |
| Sony PlayStation 2 disc | Onimusha 3 Model SLPM-65413 | 2004 | Capcom Co., Ltd. Japan |
| Nintendo GBA cart. | Onmyou Taisenki Zeroshiki Model AGB-BITJ-JPN | 2004 | Bandai Co., Ltd. Japan |
| Slot Machine | Oola Moolah | 2004 | IGT International Game Technologies Reno, NV, USA |
| Nokia N-Gage card | Operation Shadow | 2004 | Nokia |
| Slot Machine | Opponent Poker | 2004 | IGT International Game Technologies Reno, NV, USA |
| Slot Machine | Orlando | 2004 | Bally Wulff |
| Sega NAOMI cart. | Oshare Majo Love and Berry | 2004 | SEGA Corp. |
| Nintendo GBA cart. | Oshare Wanko Model AGB-A5SJ-JPN | 2004 | MTO, Inc. Japan |
