| Region | Title | System | Version | Edition | Languages | Serial | Status |
|---|
 | Odium
ōdi·um | PC | | Original |  | CD-W58-1104-0 | ![2 and more dumps from original media [!]](/images/status/green.png "2 and more dumps from original media [!]") |
 | Official Formula 1 Racing | PC | | Original |     | | |
 | The Operative: No One Lives Forever (Disc 1) | PC | 1.004 | Game of the Year Edition (BestSeller Series) | | JCPL11, S0026695 | |
 | The Operative: No One Lives Forever (Disc 2) | PC | 1.004 | Game of the Year Edition, Game of the Year Edition (BestSeller Series), Game of the Year Edition (Covermount) | | JCPL11, S0026179, S0026696 | |
 | Oh!PC 1998-nen 8-gatsu-gou Tokubetsu Furoku CD-ROM
Ｏｈ！ＰＣ １９９８年 ８月号 特別付録ＣＤ－ＲＯＭ | PC | | | | OHPC-9808 |  |
 | Operation Flashpoint: Soprotivlenie
Operation Flashpoint: Сопротивление | PC | 1.85 | |  | | |
 | Oyungezer: Mart 2010 | PC | | | | | |
 | Oil Tycoon 2
Oil Tycoon 2: Il Ritorno di una Leggenda | PC | | EXA Games | | EXAG020 | |
 | The Operational Art of War II | PC | 1.01.02 | Xplosiv | | EI-1259-3 | |
 | Oddworld: Abe's Oddysee | PC | 2.0 | Original | | IB2G-ODDG5 | |
| Only One 2: Naomi: Ai no Inori ga Todoku Toki
オンリーワン２ なおみ 愛の祈りが届く時 | PC | 1.0.0.1 | Original |  | ON2-NAO | |
| The Orange Box (Disc 1) | PC | | Rerelease | | | |
| The Orange Box (Disc 2) | PC | | Rerelease | | | |
| Die Original Moorhuhn Jagd | PC | | Best of Moorhuhn | | | |
| Oscar der Ballonfahrer und die Geheimnisse des Waldes | PC | | | | | |
 | Over 1000 Games: The Complete Encyclopedia of Games: Volume II (Disc 1)
Over 1000 Games Volume 2 | PC | | Original | | | |
| Over 1000 Games: The Complete Encyclopedia of Games: Volume II (Disc 2)
Over 1000 Games Volume 2 | PC | | Original | | | |
| The Oxfordshire Golf Club | PC | | Original | | EAE05101006D | |
| Official Sega Dreamcast Magazine: Special Edition Preview PC CD-ROM | PC | | | | | |
| Odell Down Under | PC | | Original, SoftKey | | POD544AE-CD | |
| Operation Flashpoint: Gold Upgrade | PC | 1.30 | Original, Gold Edition | | MOFUCDEU00, MOFUCDUS00 | |
| Ot zakata do rassveta
От заката до рассвета | PC | | 1C: Igroteka | | | |
| Odin Klik
Один Клик | PC | | Original | | 301/2002 | |
| Opera Fatal | PC | | Original | | | |
| Opera Fatal | PC | | Tandem | | 1444 | |
| Operaciya "X" ili novye piklyucheniya Shuricha (Disc 1)
Операция "Х" или новые приключения Шурича | PC | | 1C: Kollekciya igrushek | | | |
 | Ollo in the Sunny Valley Fair | PC | | Original |     | | |
| Obscure II
ObsCure II | PC | 1.0.0.0 | Original | | | |
| Obscure II
ObsCure II | PC | 1.0 | Covermount | | | |
| Obscure II
ObsCure II | PC | | Original | | | |
| Obscure (Disc 5)
ObsCure | PC | 1.0 | Original | | PCO457CD | |
| Obscure (Disc 4)
ObsCure | PC | 1.0 | Original | | PCO457CD | |
| Obscure (Disc 3)
ObsCure | PC | 1.0 | Original | | PCO457CD | |
| Obscure (Disc 2)
ObsCure | PC | 1.0 | Original | | PCO457CD | |
| Obscure (Disc 4)
ObsCure | PC | | Original | | | |
| Obscure (Disc 3)
ObsCure | PC | | Original | | | |
| Obscure (Disc 2)
ObsCure | PC | | Original | | | |
| Obscure (Disc 1)
ObsCure | PC | | Original | | | |
| Obscure
ObsCure | PC | 1.1 | Covermount | | | |
| Obscure
ObsCure | PC | | Software Pyramide | | | |
| Obscure
ObsCure | PC | | Original | | 71902134 | |
| Obscure
ObsCure | PC | 1.0 | Original | | 719 02 102 | |
| Obscure
ObsCure | PC | | Original | | | |
 | Obscure (Disc 4)
惊悚空间 | PC | 1.0 | Original |  | | |
| Obscure (Disc 3)
惊悚空间 | PC | 1.0 | Original | | | |
| Obscure (Disc 2)
惊悚空间 | PC | 1.0 | Original | | | |
| Obscure (Disc 1)
惊悚空间 | PC | 1.0 | Original | | | |
| Olympic Soccer | PC | | Kixx | | | |
| Oni | PC | 1.0 | Green Pepper | | | |
| Open Season
Boog & Elliot | PC | 1.0 | Demo | | | |
| Only You: Sekai no Namida to Shoujo no Hanashi: Prelude
Ｏｎｌｙ Ｙｏｕ －世界の涙と少女のハナシ－ Ｐｒｅｌｕｄｅ | PC | 1.00 | Trial Edition version:share II | | | |
| Oh!PC 1998-nen 10-gatsu-gou Tokubetsu Furoku CD-ROM
Ｏｈ！ＰＣ １９９８年 １０月号 特別付録ＣＤ－ＲＯＭ | PC | | | | OHPC-9810 | |
| The Orange Box (Disc 1) | PC | 4295 / 4539 | Rerelease |         | | |
| The Orange Box (Disc 2) | PC | 4295 / 4539 | Rerelease | | | |
 | Oro Negro: Juego de Guerra y Estrategia | PC | | Covermount | | | |
| Ohinasama: Shiawase wa Suigin no Aji
オヒナサマ ～しあわせは水銀の味～ | PC | 2.00 | Original | | SPCG-10001 | |
| Oh!PC 1998-nen 11-gatsu-gou Tokubetsu Furoku CD-ROM
Ｏｈ！ＰＣ １９９８年 １１月号 特別付録ＣＤ－ＲＯＭ | PC | | | | OHPC-9811 | |
| Outcast (Disc 1) | PC | | Limitierte Sonderausgabe | | OUTCAPC520/A1 | |
| Opsys | PC | | Original |  | | |
| Outcast (Disc 1) | PC | | Play the Games Vol. 3 | | | |
| Outcast (Disc 2) | PC | | Play the Games Vol. 3 | | | |
| Orchid Technology Kelvin MPEG Software Catalog | PC | | | | | |
| Open Season
Les Rebelles de la Forêt | PC | | Cheese Heads | | | |
| Outlaws (Disc 1) | PC | | M6 Multimedia | | M6IMM6 | |
| Outlaws (Disc 2) | PC | | M6 Multimedia | | M6IMM6 | |
| Operation Combat II | PC | 1.0 | Action CD-ROM 5 Pak | | | |
| Oryouri Jouzu: Kihon Kateiryouri-hen
お料理上手 基本家庭料理編 | PC | 1.2.0.5 | Original | | 0000037450 | |
| OS/2-Spiele Shareware | PC | | Original | | 62694 | |
| Overspeed: High Performance Street Racing | PC | | Original | | | |
| Ojarumaru: Pasokon Yarou Yo! Mouse de Jigsaw Puzzle
おじゃる丸 パソコンやろうよ！ マウスでジグソーパズル | PC | | Original | | | |
| On the Rain-Slick Precipice of Darkness: Episode One | PC | | Demo | | | |
| Oni | PC | 1.0 | Original | | | |
| Obscure
ObsCure | PC | | Best of Atari | | | |
| Obscure (Disc 1)
ObsCure | PC | 1.0 | Original | | PCO457CD | |
| Once Upon a Knight (Disc 1) | PC | | Original | | Part # 25196CD1 | |
| Once Upon a Knight (Disc 2) | PC | | Original | | Part # 25196CD2 | |
| The Orange Box (Disc 1) | PC | | Original, EA Value Games | | VAD07705811D | |
| The Orange Box (Disc 2) | PC | | Original, EA Value Games | | VAD07705811D2 | |
| Overlord | PC | 1.0 | Original | | MOVL1CDFC00 | |
| Original War (Disc 1) | PC | | Original, Gamer Collector | | | |
| Original War (Disc 2) | PC | | Original, Gamer Collector | | | |
| Overlord | PC | | Original | | MOVL1CDEU00 | |
| Omatase! Janbaraya
おまたせ！ 雀バラや♪ | PC | | Shokai Genteiban | | | |
 | Ori and the Blind Forest: Definitive Edition | PC | 5.3.2.9582331 | Original, Limited Edition | | | |
 | Of Orcs and Men | PC | | Original | | | |
| Out of This World | PC | | Valueware | | CD-ICD-142-0 | |
| Obscure: The Aftermath
ObsCure: The Aftermath | PC | | Original | | | |
| Order of War | PC | | Original | | OOW/LAB1 | |
| Operaciya Silent Storm: Chasovye (Disc 1)
Операция Silent Storm: Часовые | PC | | 1C: Igroteka | | | |
| Operaciya Silent Storm: Chasovye (Disc 2)
Операция Silent Storm: Часовые | PC | | 1C: Igroteka | | | |
 | Ontdek de Boerderij met Barabas de Boekenbij | PC | | Original | | | |
| Onsen Ping-Pong
温泉卓球 | PC | | Event Oyobi Tsuushin Hanbaiban | | | |
| OceanDive: Ocean Diving Adventure | PC | 1.2 | Hall of Game - 4Games Vol. 9 | | | |
| The Operative: No One Lives Forever (Disc 1) | PC | 1.0 | Original | | | |
| The Operative: No One Lives Forever (Disc 2)
In the Lounge with No One Lives Forever | PC | 1.0 | Original | | | |
| Oh No! More Creatures | PC | | Tewi | | Bestell-Nr. 27665 | |
| Oregon Trail II | PC | 1.3 | Rerelease | | #HCD744AE-CD | |
| OMSI 2 | PC | 2.2.032 | Original | | | |
| The Operative: No One Lives Forever (Disc 1) | PC | | Game of the Year Edition | | | |
| Outlaws: Die Gesetzlosen (Disc 2) | PC | 1.1.1 | Rerelease | | | |
| Outlaws: Die Gesetzlosen (Disc 1) | PC | 1.1 | Rerelease | | | |
| Operation Body Count | PC | | Original | | | |
 | Overwatch | PC | | Origins Edition | | | |
| Owlboy | PC | 0.0.6152.604 | IndieBox | | | |
| Our House Featuring The Family Circus | PC | | Original | | | |
| One Unit Whole Blood | PC | 1.21 | Original | | 04-16459CD1 | |
| Oh!PC 1999-nen 1-gatsu-gou Tokubetsu Furoku CD-ROM
Ｏｈ！ＰＣ １９９９年 １月号 特別付録ＣＤ－ＲＯＭ | PC | | | | OHPC-9901 | |
| Oh!PC 1999-nen 2-gatsu-gou Tokubetsu Furoku CD-ROM
Ｏｈ！ＰＣ １９９９年 ２月号 特別付録ＣＤ－ＲＯＭ | PC | | | | OHPC-9902 | |
| Oh!PC 1999-nen 3-gatsu-gou Tokubetsu Furoku CD-ROM
Ｏｈ！ＰＣ １９９９年 ３月号 特別付録ＣＤ－ＲＯＭ | PC | | | | OHPC-9903 | |
| Oh!PC 1998-nen 12-gatsu-gou Tokubetsu Furoku CD-ROM
Ｏｈ！ＰＣ １９９８年 １２月号 特別付録ＣＤ－ＲＯＭ | PC | | | | OHPC-9812 | |
 | Outlaws (Disc 1)
アウトロー | PC | 1.0 Build 3 | Original | | 9511830 | |
| Outlaws (Disc 2)
アウトロー | PC | 1.0 Build 3 | Original | | 9511831 | |
| Over Luna Clock | PC | | C81 Test Version | | | |
| Of Light and Darkness: The Prophecy: Premonitions Disk | PC | | | | CD-C95-166-DM | |
 | Omikron: The Nomad Soul (Disc 1)
오미크론: 노매드 소울 | PC | 1.00.000 | Original | | | |
| Omikron: The Nomad Soul (Disc 2)
오미크론: 노매드 소울 | PC | 1.00.000 | Original | | | |
| Omikron: The Nomad Soul (Disc 3)
오미크론: 노매드 소울 | PC | 1.00.000 | Original | | | |
| Oh!PC 1999-nen 4-gatsu-gou Tokubetsu Furoku CD-ROM (Disc A) (FreeBSD 2.2.8-RELEASE Install Disc)
Ｏｈ！ＰＣ １９９９年 ４月号 特別付録ＣＤーＲＯＭ | PC | | | | OHPC-9904A | |
| Oh!PC 1999-nen 4-gatsu-gou Tokubetsu Furoku CD-ROM (Disc B) (FreeBSD 2.2.8-RELEASE Packages & Applications)
Ｏｈ！ＰＣ １９９９年 ４月号 特別付録ＣＤーＲＯＭ | PC | | | | OHPC-9904B | |
| Oh!PC 1999-nen 5-gatsu-gou Tokubetsu Furoku CD-ROM
Ｏｈ！ＰＣ １９９９年 ５月号 特別付録ＣＤ－ＲＯＭ | PC | | | | OHPC-9905 | |
 | Oil Pipes | PC | | Original | | | |
| Oh!PC 1999-nen 6-gatsu-gou Tokubetsu Furoku CD-ROM
Ｏｈ！ＰＣ １９９９年 ６月号 特別付録ＣＤ－ＲＯＭ | PC | | | | OHPC-9906 | |
 | Opowieści z Narnii: Lew, Czarownica i stara szafa
The The Chronicles of Narnia: The Lion Witch and The Wardrobe | PC | | Dookoła Filmu | | P_17791_03A_PL | |
 | Oil Tycoon | PC | 1.01 | Original | | | |
| Ostrov drakonov: Bashnya znanij 2
Остров драконов. Башня знаний 2 | PC | | Original | | | |
| Oddworld: Abe's Exoddus (Instalar) | PC | 2.0 | Original | | | |
| Oddworld: Abe's Exoddus (Jugar) | PC | 2.0 | Original | | | |
| The Outforce | PC | 1.0.1.0 | Original | | 04-22008CD | |
| Operation Mania | PC | 1.0.5.64r | Original | | 1912507 | |
| Only One 3in1
オンリーワン ３ｉｎ１ | PC | | PC Game Bundle | | | |
| Only One + R: Higyaku no Mermaid Minano
オンリーワン＋Ｒ ～被虐のマーメイド美奈乃～ | PC | | Original | | | |
| Obratnyj otschet
Обратный отсчет | PC | v.1 1.06.10.22 | Original | | | |
| Overboard! | PC | | Dice | | DCG 005752, DMM 005776 | |
| Overboard! | PC | | Dice | | DCG 005752, DMM 005776 | |
| Overboard! | PC | | Original | | | |
| Open Season (Disc 1)
Сезон Охоты | PC | | Original | | | |
| Open Season (Disc 2)
Сезон Охоты | PC | | Original | | | |
| Open Season (Disc 3)
Сезон Охоты | PC | | Original | | | |
| O.D.T. | PC | | Original | | | |
| 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 | | | |
| Oh!PC 1999-nen 7-gatsu-gou Tokubetsu Furoku CD-ROM
Ｏｈ！ＰＣ １９９９年 ７月号 特別付録ＣＤ－ＲＯＭ | PC | | | | OHPC-9907 | |
| Oh!PC 1999-nen 8-gatsu-gou Tokubetsu Furoku CD-ROM
Ｏｈ！ＰＣ １９９９年 8月号 特別付録ＣＤ－ＲＯＭ | PC | | | | OHPC-9908 | |
| Operation Flashpoint: Cold War Crisis | PC | 1.46 | Sold Out Software | | | |
 | Overlord
BGamer 153 (Side A) | PC | | Covermount | | | |
| The Oregon Trail 3rd Edition: Pioneer Adventures (Disc 3) | PC | 1.3 | The Learning Company | | OAE744BE-CD3 | |
| 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 1) | PC | 1.3 | The Learning Company | | OAE744BE-CD1 | |
| One Must Fall 2097 | PC | | Shareware | | CDR2022 | |
| Over 1000 Games: The Complete Encyclopedia of Games (Disc 1) | PC | | Rerelease | | | |
| Over 1000 Games: The Complete Encyclopedia of Games (Disc 2) | PC | | Rerelease | | | |
| Over 1000 Games: The Complete Encyclopedia of Games (Disc 1) | PC | | Original | | | |
| Over 1000 Games: The Complete Encyclopedia of Games (Disc 2) | PC | | Original | | | |
| Osananajimi wa Pet Yakuza!
幼なじみはペットヤクザ！ | PC | | Taikenban | | | |
| Otome Koigokoro Prister
乙女恋心プリスター | PC | | Taikenban | | | |
| Operacja Pustynny Grom / The Partners | PC | | Covermount | | | |
| Operation | PC | | General Mills | | AM801R5 | |
| OfficeGames | PC | | Original | | | |
| Oh!PC 1999-nen 9-gatsu-gou Tokubetsu Furoku CD-ROM
Ｏｈ！ＰＣ １９９９年 ９月号 特別付録ＣＤ－ＲＯＭ | PC | | | | OHPC-9909 | |
| Oh!PC 1999-nen 11-gatsu-gou Tokubetsu Furoku CD-ROM
Ｏｈ！ＰＣ １９９９年 １１月号 特別付録ＣＤ－ＲＯＭ | PC | | | | OHPC-9911 | |
| Oh!PC 1999-nen 10-gatsu-gou Tokubetsu Furoku CD-ROM
Ｏｈ！ＰＣ １９９９年 １０月号 特別付録ＣＤ－ＲＯＭ | PC | | | | OHPC-9910 | |
