| Ojaru Maru - Tsuki Hikari Machi Tour de Ojaru (J)(Trashman) | |
| Okaitoku Series 5 - Puzzle & Tantei Collection (J)(Patience) | |
| Okuman Chouja Game (J)(Independent) | |
| One Piece - Going Baseball Haejeok Yaku (K)(Independent) | |
| One Piece - Mezase! King of Paris (J)(Cezar) | |
| One Piece - Nanatsu Shima no Daihihou (J)(Cezar) | |
| One Piece Dragon Dream (J)(Caravan) | |
| One Piece Going Baseball (J)(Eurasia) | |
| Onimusha Tactics (E)(Patience) | |
| Onimusha Tactics (J)(Eurasia) | |
| Onimusha Tactics (U)(Mode7) | |
| Onmyou Taisenki Zeroshiki (J)(Caravan) | |
| Open Season (E)(Rising Sun) | |
| Open Season (E)(Sir VG) | |
| Open Season (U)(Rising Sun) | |
| Operation Armored Liberty (U)(Rising Sun) | |
| Oriental Blue - Ao no Tengai (J)(Cezar) | |
| Original Sunset Wilds title card & sprites for MK - SC by SCD | |
| Oshaberi Inco Club (J)(Chakky) | |
| Oshare Princess (J)(Chakky) | |
| Oshare Princess 2 And Doubutsu Kyaranabi (J)(Mugs) | |
| Oshare Princess 3 (J)(Rising Sun) | |
| Oshare Princess 5 (J)(Supplex) | |
| Oshare Princess EX Primo Debut Monogatari & Renai Uranai Daisakusen (J)(Caravan) | |
| Start G | |
| ame | |
| Oshare Wanko (J)(Supplex) | |
| Ottifanten Pinball (G)(Rising Sun) | |
| Ougon no Taiyo (J)(Eurasia) | |
| Ougon no Taiyou - Shitsu Warate Jidai (J)(Eurasi | |
| a) | |
| Our Breeding Series - My Ameba (J)(Eurasia) | |
| Our Breeding Series - My Beetle (J)(Eurasia) | |
| Over the Hedge - Beesten Bij de Buren (N)(Independent) | |
| Over the Hedge - Hammy Goes Nuts (E)(Rising Sun) | |
| Over the Hedge - Hammy Goes Nuts (U)(Rising Sun) | |
| Over the Hedge (E)(Independent) | |
| Over the Hedge (U)(Trashman) | |
| Ozzy & Drix (U)(Independent) | |
| Paard & Pony - Mijn Manege (E)(sUppLeX) | |
| Paard & Pony - Paard in Galop (E)(sUppLeX) | |
| Pac-Man Collection (E)(Lightforce) | |
| Pac-Man Collection (J)(Cezar) | |
| Pac-Man Collection (U)(Mode7) | |
| Pac-Man Collection+ | |
| Pac-Man Pinball Advance (E)(Rising Sun) | |
| Pac-Man Pinball Advance (U)(TrashMan) | |
| Pac-Man World (E)(Rising Sun) | |
| Pac-Man World (U)(Venom) | |
| Pac-Man World 2 (E)(Trashman) | |
| Pac-Man World 2 (U)(Trashman) | |
| Paperboy & Rampage (E)(Supplex) | |