| Region | Title | System | Version | Edition | Languages | Serial | Status |
|---|
 | OutRun 2 SP
アウトラン２ スペシャルツアーズ | PS2 | 1.03 | Shokai Genteiban |  | SLPM 66628 | ![2 and more dumps from original media [!]](/images/status/green.png "2 and more dumps from original media [!]") |
 | OutRun 2006: Coast 2 Coast | PSP | 1.03 | Original |  | ULUS-10064 |  |
 | Official Demo Disc 1: Retail Edition November 01 | PS2 | 1.04 | Kiosk Demo | | SCED-50615 | |
| Oh-chan no Oekaki Logic for Palm
おーちゃんのお絵かきロジック ｆｏｒ Ｐａｌｍ | PALM | 1.04 | Original | | | |
 | OMSI: Der Omnibussimulator | PC | 1.04 | OMSI Bundle | | | |
| Ore ga Kantoku da! Volume 2: Gekitou Pennant Race
オレが監督だ！Ｖｏｌｕｍｅ．２ ～激闘ペナントレース～ | PS2 | 1.04 | Original | | SLPM 65056 | |
| Oretachi Geesen Zoku: Super Volleyball
オレたちゲーセン族 スーパーバレーボール | PS2 | 1.04 | Original | | SLPM 62660 | |
| Oretachi Geesen Zoku: Terra Cresta
オレたちゲーセン族 テラクレスタ | PS2 | 1.04 | Original | | SLPM 62661 | |
| Otome wa Boku ni Koishiteru
乙女はお姉さまに恋してる | PS2 | 1.05 | Original | | SLPM 66165 | |
 | Les Ours Berenstain: Comme des Grands | CDI | 1.05 | |  | 812 0063 | |
| Official Sega Dreamcast Magazine Vol. 6: July 2000 | DC | 1.050 | | | IGN6 | |
 | Ontdek het Onbekende Nederland | CDI | 1.06 | Original |  | 814 0104 | |
| Ochigee Designer Tsukutte Pon!
落ちゲー・デザイナー 作ってポン！ | SS | 1.090 | Original | | T-9108G | |
 | Obitel' t'my: Sumerki
Обитель тьмы: Сумерки | PC | 1.1 | Original |  | | |
 | Obscure
ObsCure | PC | 1.1 | Covermount |  | | |
| One Must Fall 2097
One Must Fall 2097 CD-ROM | PC | 1.1 | ROMWARE |  | ROM 10017 | |
| The Oregon Trail 4th Edition (Disc 1) | PC | 1.1 | Rerelease | | OTF744BE-CD1 | |
| The Oregon Trail 4th Edition (Disc 2) | PC | 1.1 | Rerelease | | OTF744BE-CD2 | |
| The Oregon Trail 4th Edition (Disc 3) | PC | 1.1 | Rerelease | | OTF744BE-CD3 | |
| The Oregon Trail 5th Edition: Adventures Along the Oregon Trail | PC | 1.1 | Rerelease, Southwestern School Set | | 380859B-CD | |
| The Oregon Trail | PC | 1.1 | Original | | #HCD606 | |
| Overclocked: Una Storia di Violenza | PC | 1.1 | Original | | | |
 | Official PlayStation 2 Magazine-UK Greatest Hits Volume 8: Special Edition: Racing Games
playstation 2 greatest hits volume 8 | PS2 | 1.10 | |  | SCED-50786 | |
| Operation WinBack | PS2 | 1.10 | Original | | SLES-50155 | |
| On-Robot
Он-Робот | PC | 1.14SB | 1C: Igrushki | | | |
| Oficery: Special'noe izdanie
Офицеры: Специальное издание | PC | 1.18.2 | Original | | | |
| OceanDive: Ocean Diving Adventure | PC | 1.2 | Hall of Game - 4Games Vol. 9 | | | |
 | Operation Neptun | PC | 1.2 | Original |  | ONT844AW-CD | |
| The Oregon Trail 3rd Edition: Pioneer Adventures (Disc 1) | PC | 1.2 | Original | | OTA744CE-CD1 | |
| The Oregon Trail 3rd Edition: Pioneer Adventures (Disc 1) | PC | 1.2 | Rerelease | | OTA744BE-CD1 | |
| The Oregon Trail 3rd Edition: Pioneer Adventures (Disc 2) | PC | 1.2 | Original | | OTA744BE-CD2 | |
| The Oregon Trail 3rd Edition: Pioneer Adventures (Disc 3) | PC | 1.2 | Original | | OTA744BE-CD3 | |
| The Oregon Trail | PC | 1.2 | Original | | #HCD706 | |
| The Oregon Trail | PC | 1.2 | Original | | #HCD706 | |
 | Overlord | PC | 1.2 | Original |  | MOVL1CDPL00 (DVD), POVL1CDPL03 (Box) | |
| Overlord | PC | 1.2 | Original | | | |
| Oryouri Jouzu: Kihon Kateiryouri-hen
お料理上手 基本家庭料理編 | PC | 1.2.0.5 | Original | | 0000037450 | |
| The Omega Stone: Riddle of the Sphinx II (Disc 1) | PC | 1.2.3.2 | Original | | | |
| The Omega Stone: Riddle of the Sphinx II (Disc 2) | PC | 1.2.3.2 | Original | | | |
| The Omega Stone: Riddle of the Sphinx II (Disc 3) | PC | 1.2.3.2 | Original | | | |
| The Omega Stone: Riddle of the Sphinx II (Disc 4) | PC | 1.2.3.2 | Original | | | |
| Oregon Trail II + Logic Quest | PC | 1.2/1.0 | Original | | | |
| Official Sega Dreamcast Magazine Vol. 10: January 2001 | DC | 1.200 | | | IGN10 | |
| The Oregon Trail | PC | 1.21 | | | | |
| Operation Neptune | PC | 1.22 | Original | | ONT744CE-CD | |
| The Oregon Trail | PC | 1.22 | Smart Saver | | ORT844AE-CD | |
| Operation Neptune | PC | 1.23 | The ClueFinders: Math Ages 9-12 | | ONT744EE-CD | |
| The Oregon Trail 3rd Edition: Pioneer Adventures (Disc 1) | PC | 1.2a | Bundle Version Compaq Presario OEM | | | |
| The Oregon Trail 3rd Edition: Pioneer Adventures (Disc 1) | PC | 1.3 | The Learning Company | | OAE744BE-CD1 | |
| The Oregon Trail 3rd Edition: Pioneer Adventures (Disc 2) | PC | 1.3 | The Learning Company | | OAE744BE-CD2 | |
| The Oregon Trail 3rd Edition: Pioneer Adventures (Disc 3) | PC | 1.3 | The Learning Company | | OAE744BE-CD3 | |
| Oregon Trail II | PC | 1.3 | Smart Saver | | 0TT744AE-CD | |
| Oregon Trail II | PC | 1.3 | Rerelease | | #HCD744AE-CD | |
| Oregon Trail II | PC | 1.3 | Smart Saver | | 381032-CD/i401ha | |
| Oregon Trail II: 25th Anniversary Limited Edition | PC | 1.3 | Original, SoftKey | | #OTR744AE-CD | |
| Overlord: Raising Hell | PC | 1.3 | Original | | MOVLRCDEU00 | |
| Overlord: Raising Hell | PC | 1.3 | Original | | | |
| Operation Flashpoint: Gold Upgrade | PC | 1.30 | Original | | MOFUCDUS00 | |
 | Operation Flashpoint: Gold Upgrade | PC | 1.30 | Original, Gold Edition | | MOFUCDEU00, MOFUCDUS00 | |
| Oregon Trail II | PC | 1.31 | Rerelease | | HCD744BE-CD | |
| Oregon Trail II | PC | 1.31 | Rerelease | | #HCD744AE-CD | |
| Okudera Yasuhiko no Sekai o Mezase! Soccer Kids: Nyuumon-hen
奥寺康彦の世界をめざせ! サッカー・キッズ 入門編 | SS | 1.310 | Original | | T-26001G | |
| Oregon Trail II | PC | 1.32 | Rerelease | | #HCD744CE-CD | |
| Over the Monochrome Rainbow featuring Shogo Hamada | PS2 | 1.40 | Original | | SLPM 65271 | |
| Operation Flashpoint: Cold War Crisis | PC | 1.46 | Sold Out Software | | | |
| Operation Flashpoint: Cold War Crisis | PC | 1.46 | Sold Out Software | | | |
| Operation Flashpoint: Holodnaja vojna
Операция Flashpoint: Холодная война | PC | 1.46 | Original | | | |
| The Operative: No One Lives Forever | PS2 | 1.50 | Original | | SLUS 20028 | |
| Operation Flashpoint: Resistance | PC | 1.75 | Original | | MOFRCDEU00 | |
| Operation Flashpoint: Resistance | PC | 1.75 | Original | | MOFRCDUS00 | |
| Operation Flashpoint: Soprotivlenie
Operation Flashpoint: Сопротивление | PC | 1.85 | | | | |
| Oxford Handbook of Clinical Medicine for PDAs: Seventh Edition | PALM | 10.0.05/2007.9.7 | | | | |
 | Oddworld: Abe's Exoddus (Instalar) | PC | 2.0 | Original | | | |
| Oddworld: Abe's Exoddus (Jugar) | PC | 2.0 | Original | | | |
| Oddworld: Abe's Exoddus (Play Disc) | PC | 2.0 | Budget, Covermount | | MMICDR 5280 | |
| Oddworld: Abe's Exoddus (Install Disc) | PC | 2.0 | Original | | | |
| Oddworld: Abe's Exoddus (Play Disc) | PC | 2.0 | Original | | | |
| Oddworld: Abe's Exoddus (CD Installieren) | PC | 2.0 | Original | | | |
| Oddworld: Abe's Exoddus (CD Abspielen) | PC | 2.0 | Original | | | |
| Oddworld: Abe's Exoddus (Installatie Disk) | PC | 2.0 | Budget | | MMICDR 5280 | |
| Oddworld: Abe's Exoddus (Install) | PC | 2.0 | Original | | 04-15993CD1 | |
| Oddworld: Abe's Oddysee | PC | 2.0 | Original | | IB2G-ODD5 | |
| Oddworld: Abe's Oddysee | PC | 2.0 | Original | | IB2G-ODDG5 | |
| Oddworld: Abe's Oddysee | PC | 2.0 | Covermount | | IB2G-ODDI5 | |
| Oddworld: Abe's Oddysee | PC | 2.0 | Channelware | | 04-15303 | |
| Oddworld: Abe's Oddysee | PC | 2.0 | Original | | 04-12608CD | |
| Ore no Shikabane o Koete Yuke
俺の屍を越えてゆけ | PSP | 2.00 | PSP the Best, PSP the Best Low Price | | UCJS 18052 … | |
| Ougon Musou Kyoku Cross
黄金夢想曲 ＣＲＯＳＳ | PC | 2.00 | Original | | | |
| Olympic Soccer | SS | 2.000 | Original | | T-7904H-09, T-7904H-50 | |
| Olympic Soccer | SS | 2.000 | Original | | T-07904H-18 | |
| Olympic Soccer | SS | 2.000 | Original | | T-7904H | |
 | OutRun 2 | CHIHIRO | 2.000 | Original | | GDX-0004A | |
| One Must Fall 2097 | PC | 2.1 | The Smile Edition | | CDR3016 | |
| Oscar Wilde's The Selfish Giant | PC | 2.10 | Original | | MQ 13-004-144 | |
| One Must Fall: Battlegrounds | PC | 2090 | Original | | | |
| One Must Fall: Battlegrounds | PC | 2090 | Original | | | |
| The Oregon Trail | PC | 3.0.1 | Slash | | CDRM1239790 | |
| The Oregon Trail: Classic Edition | PC | 3.0.1 | SoftKey | | POT144CE-CD | |
| The Orange Box (Disc 1) | PC | 4295 / 4539 | Rerelease |           | | |
| The Orange Box (Disc 2) | PC | 4295 / 4539 | Rerelease | | | |
| ODS Robot Challenge | PC | 5.0.1r26 | Teacher's Edition | | | |
| ODS Air Explorer | PC | 5.0r134 | Teacher's Edition | | | |
| ODS Air Explorer | PC | 5.0r134 | Teacher's Edition | | | |
| ODS Amazing Art Corner | PC | 5.0r134 | Teacher's Edition | | | |
| ODS Carnival Math | PC | 5.0r134 | Teacher's Edition | | | |
| ODS Carnival Math | PC | 5.0r134 | Teacher's Edition | | | |
 | Ori and the Blind Forest: Definitive Edition | PC | 5.3.2.9582331 | Original, Limited Edition | | | |
| Oz: The Magical Adventure | PC | 7.0.0.198 | Rerelease | | 92785 | |
| Operaciya Silent Storm (Disc 1)
Операция Silent Storm | PC | Aug 11 2003 | 1C: Igroteka | | | |
| Operaciya Silent Storm (Disc 2)
Операция Silent Storm | PC | Aug 11 2003 | 1C: Igroteka | | | |
| OnHand Chess / Sega Swirl Lite | PALM | PDA103-01 | Original | | PDA103-01 | |
| OnHand Sports Games / Sega Swirl Lite | PALM | PDA105-01 | OnHand Double Pack (Sports Games/Astrologer) | | PDA105-01 | |
| OnHand Complete Astrologer
OnHand Complete Astrologer: Horoscopes & More! | PALM | PDA108-01 | OnHand Double Pack (Sports Games/Astrologer) | | PDA108-01 | |
| Out of This World | 3DO | RE | 3DO Maniac Pack | | | |
| Oddworld: Abe's Oddysee | PSX | Rev 1 | Original, Greatest Hits | | SLUS-00190 | |
| Once Upon a Time | WII | Rev 1 | Original | | RVL-SUTE-USA-B0 | |
| One Piece: Unlimited Cruise: Episode 1: Nami ni Yureru Hihou
ワンピース アンリミテッドクルーズ エピソード1 波に揺れる秘宝 | WII | Rev 1 | Minna no Osusume Selection | | RVL-ROUJ-JPN-B0 | |
| One Piece: Unlimited Cruise: Episode 2: Mezameru Yuusha
ワンピース アンリミテッドクルーズ エピソード２ 目覚める勇者 | WII | Rev 1 | Original | | RVL-RIUJ-JPN-B0 | |
| Onechanbara: Bikini Zombie Slayers | WII | Rev 1 | Original | | RVL-RONP-EUR | |
| Onside Complete Soccer | PSX | Rev 1 | Original | | SLES-00079 | |
| Oops! Prank Party | WII | Rev 1 | Original | | RVL-SPIE-USA-B0 | |
| Option: Tuning Car Battle
オプション チューニングカーバトル | PSX | Rev 1 | PlayStation the Best | | SLPS 91037 | |
| Order Up! | WII | Rev 1 | Original | | RVL-ROXE-USA | |
| OverBlood 2 (Disc 1) | PSX | Rev 1 | Original | | SLES-01879 … | |
| OverBlood 2 (Disc 2) | PSX | Rev 1 | Original | | SLES-11879 … | |
| OverBlood 2 (Disc 1) | PSX | Rev 1 | Original | | SLES-02187 … | |
| OverBlood 2 (Disc 2) | PSX | Rev 1 | Original | | SLES-12187 … | |
| Oddworld: Abe's Oddysee | PSX | Rev 2 | Greatest Hits | | SLUS-00190 | |
| Oshare Cooking
おしゃれクッキング | FMT | Rev A | Original | | HMA-267A | |
| Oshare Cooking II
おしゃれクッキングⅡ | FMT | Rev B | Original | | HMA-267B | |
| Ore no Shita de Agake
俺の下であがけ | PC | System3.9 Ver.5.43 | Original | | ALB-005 | |
| Obratnyj otschet
Обратный отсчет | PC | v.1 1.06.10.22 | Original | | | |
| Outcry (Disc 1)
Outcry: The Dawn | PC | Version DPV 1.0 | Original | | PCO596CD | |
| Outcry (Disc 2)
Outcry: The Dawn | PC | Version DPV 1.0 | Original | | PCO596CD | |
