| 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 |
| Pachinko | Osomatsukun | 2004 | Daiichi Denshi |
| Slot Machine | Othello | 2004 | IGT International Game Technologies Reno, NV, USA |
| Pachinko | Otoko no Hanamichi | 2004 | Takao Co., Ltd. Japan |
| Arcade Video game | Out Run 2 SP - Special Tours | 2004 | SEGA Corp. |
| Microsoft XBOX disc | Outlaw Golf 2 | 2004 | Unknown |
| Microsoft XBOX disc | OutRun 2 | 2004 | Unknown |
| Dedicated Console | OutRun 2019 | 2004 | Radica Games |
| PC/MS-Windows CD | Oyaji no Chousen Otoko no Internet-Jutsu | 2004 | MediaKite Japan |
| PC/MS-Windows CD | Oyaji no Chousen Otoko no Word-jutsu | 2004 | MediaKite Japan |
| PC/MS-Windows CD | Oyaji no chousen Pro-Mahjong Kiwame Tengen-sen-hen Model MKO-007 | 2004 | MediaKite Japan |
| PC/MS-Windows CD | Oyaji no Golf - Sukidesu Golf Model MKO-016 | 2004 | MediaKite Japan |
| PC/MS-Windows CD | Oyaji no Himatsubushi - Space Invaders Model MKO-019 | 2004 | MediaKite Japan |
| PC/MS-Windows CD | Oyaji no Katsuryoku Chou Unou-Ryoku Game Model MKO-008 | 2004 | MediaKite Japan |
| PC/MS-Windows CD | Oyaji no Katsuryoku Otoko no Sokudoku-jutsu | 2004 | MediaKite Japan |
| PC/MS-Windows CD | Oyaji no katsuryoku Oyaji no Keisan Drill Model MKO-009 | 2004 | MediaKite Japan |
| PC/MS-Windows CD | Oyaji no Katsuyou-jutsu Dejikame Henshuu-chou Model MKO-011 | 2004 | MediaKite Japan |
| PC/MS-Windows CD | Oyaji no katsuyou-jutsu Oyaji no Kinko-ban Model MKO-012 | 2004 | MediaKite Japan |
| PC/MS-Windows CD | Oyaji no Shumi Oyaji no Bass Fishing Model MKO-015 | 2004 | MediaKite Japan |
| PC/MS-Windows CD | Oyaji no Shumi Oyaji no Karaoke - Segakara for PC | 2004 | MediaKite Japan |
| Arcade Video game | P's Attack | 2004 | Uniana Seoul, Koera |
| PC/MS-Windows CD | Pac-Man World 2 | 2004 | HIP Games |
| PC/MS-Windows CD | Pac-Man World 2 | 2004 | LSP Light & Shadow Production |
| Nintendo GBA cart. | Pac-Man World Model AGB-BPAE-USA | 2004 | NAMCO, Ltd. Japan |
| Nintendo GBA cart. |  Pac-Man World Model AGB-BPAP-EUR | 2004 | Zoo Digital Publishing |
| Nintendo GBA cart. | Pac-Man NES Classic + 6 Model AGB-FPMP | 2004 | Nintendo Co., Ltd. Japan |
| Pachinko | Pachinko Appare Ouendan II TR | 2004 | Kyoraku Sangyo Japan |
| Pachinko | Pachinko Do Tsu Kazan KR | 2004 | Kyoraku Sangyo Japan |
| Pachinko | Pachinko Kamen Rider Hane Mono HW | 2004 | Kyoraku Sangyo Japan |
| Sony PlayStation 2 disc | Pachitte Chonmage Tatsujin 5 Model SLPS-20366 | 2004 | Hack Berry Japan |
| Sony PlayStation 2 disc | Pachitte Chonmage Tatsujin 6 Model SLPS-20388 | 2004 | Hack Berry Japan |
| Sony PlayStation 2 disc | Pachitte Chonmage Tatsujin 7 Model SLPS-20397 | 2004 | Hack Berry Japan |
| PC/MS-Windows CD | Pacific Fighters | 2004 | Ubisoft Ent. Montreuil sous Bois, France |
