| Region | Title | System | Version | Edition | Languages | Serial | Status |
|---|
 | Outlaws (Disc 2) | PC | 1.0 | Original |  | 9511831 | ![2 and more dumps from original media [!]](/images/status/green.png "2 and more dumps from original media [!]") |
| Outlaws (Disc 1) | PC | 1.0 | Original | | 9511830 | |
 | One Unit Whole Blood | PC | 1.21 | Original | | 04-16459CD1 | |
 | Operation Flashpoint: Holodnaja vojna
Операция Flashpoint: Холодная война | PC | 1.46 | Original |  | | |
| Oni
Они | PC | 1.0 | | | | |
| Oddworld: Abe's Oddysee | PC | 2.0 | Original | | 04-12608CD | |
| OutRun 2006: Coast 2 Coast | PC | 1.0 | Original |     | SEGA-PC029 | |
| The Orange Box (Disc 2) | PC | | Original |      | 985217 | |
 | The Orange Box (Disc 1) | PC | | Original, EA Classics | | 985207, VAE07705811D, VAE07705811D/ENG, VAE07707118D/ENG, VAX07705811D/AUS | |
| Otverzhennye: Tajna temnoj rasy (Disc 1)
Отверженные: Тайна темной расы | PC | | 1C: Igrushki | | SNOW OT21 0110 IR | |
| Obscure II
ObsCure II | PC | 1.0.0.0 | Original | | | |
| Oregon Trail II | PC | 1.31 | Rerelease | | #HCD744AE-CD | |
| The Oregon Trail | PC | 1.2 | Original | | #HCD706 | |
| The Oregon Trail 3rd Edition: Pioneer Adventures (Disc 3) | PC | | Original | | OTA744AE-CD3 | |
| The Oregon Trail 3rd Edition: Pioneer Adventures (Disc 2) | PC | | Original | | OTA744AE-CD2 | |
| The Oregon Trail 3rd Edition: Pioneer Adventures (Disc 1) | PC | 1.0 | Original | | OTA744AE-CD1 | |
 | Outlaws (Disc 1) | PC | 1.0 | Original | | | |
| Outlaws (Disc 2) | PC | 1.0 | Original | | | |
| Official Sega Dreamcast Magazine: Special Edition Preview PC CD-ROM | PC | | | | | |
| Outpost | PC | 1.5 | Rerelease, SierraOriginals | | | |
| Operation Flashpoint: Cold War Crisis | PC | 1.0 | Original | | MOPFCDUS00 | |
| Outcast | PC | | DVD-ROM |  | | |
| Obscure
ObsCure | PC | | Software Pyramide | | | |
| Outcast (Disc 1) | PC | | Original | | 42831-9110TC | |
| Othello | PC | | Original | | | |
| Orion Burger | PC | | Gold Games 2 (CD 11) | | SPI 046 | |
 | Operation Flashpoint: Cold War Crisis | PC | | The Games Collection | | | |
| 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, S0026707 | |
| The Operative: No One Lives Forever (Disc 1) | PC | 1.004 | Game of the Year Edition | | | |
| Over 1000 Games: The Complete Encyclopedia of Games (Disc 1) | PC | | Rerelease | | | |
| Over 1000 Games: The Complete Encyclopedia of Games (Disc 2) | PC | | Rerelease | | | |
| Outcast (Disc 1) | PC | | Original | | OUTCAPC52G/A1 | |
| Outcast (Disc 2) | PC | | Original | | OUTCAPC52G/A2 | |
| The Oregon Trail 5th Edition: Adventures Along the Oregon Trail | PC | 1.0 | Original | | 380859-CD | |
 | 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 | |
| The Oregon Trail | PC | 1.2 | Original | | #HCD706 | |
| Oregon Trail II | PC | 1.31 | Rerelease | | HCD744BE-CD | |
 | The Orange Box (Disc 2) | PC | | Original, EA Classics | | VAE07705811D2/ENG, VAE07707118D2/ENG, VAX07705811D2, VAX07705811D2/AUS | |
| OutRun 2006: Coast 2 Coast | PC | | Gamer's Choice | | THQ70690 | |
| The Original Links | PC | | Solid Gold Edition | | | |
| Operation Flashpoint: Cold War Crisis | PC | 1.0 | Original, Gold Edition | | MOPFCDEU00 | |
| Operation Flashpoint: Gold Upgrade | PC | 1.30 | Original, Gold Edition | | MOFUCDEU00, MOFUCDUS00 | |
| Oddworld: Abe's Oddysee | PC | 2.0 | Original | | IB2G-ODD5 | |
| Oddworld: Abe's Exoddus (Play Disc) | PC | 2.0 | Budget, Covermount | | MMICDR 5280 | |
| Overboard! | PC | | Dice | | DCG 005752, DMM 005776 | |
 | Omar Sharif Bridge | PC | 1.0 | Original | | | |
| The Operative: No One Lives Forever (Disc 1) | PC | 1.0 | Original | | | |
| Outlaws (Disc 1) | PC | 2.0 | LucasArts Classics | | 3000009.101.UK | |
| Outlaws (Disc 2) | PC | 2.0 | LucasArts Classics | | 3000009.102.UK | |
| Overboard! | PC | | Original | | | |
| O.D.T. | PC | | Original | | | |
| Odyssey: The Search for Ulysses (Disc 2) | PC | | Original | | ODY-ENCD2 | |
| Odyssey: The Search for Ulysses (Disc 1) | PC | | Original | | ODY-ENCD1 | |
| The Operative: No One Lives Forever (Disc 1) | PC | 1.0 | Original |  | FXX08903223D1 | |
| Oddworld: Abe's Exoddus (Install Disc) | PC | 2.0 | Original | | | |
| Oddworld: Abe's Exoddus (Play Disc) | PC | 2.0 | Original | | | |
 | Outlaws (Disc 1) | PC | | Original | | | |
| Outlaws (Disc 2) | PC | | Original | | | |
| Outwars (Disc 1) | PC | 1.0 | Original | | 0298 Part No. X03-63527 | |
| Outwars (Disc 2) | PC | 1.0 | Original | | 0298 Part No. X03-57509 | |
| Operation Flashpoint: Gold Upgrade | PC | 1.30 | Original | | MOFUCDUS00 | |
| Outlaws: Die Gesetzlosen (Disc 1) | PC | 1.1 | Rerelease | | | |
| Outlaws: Die Gesetzlosen (Disc 2) | PC | 1.1.1 | Rerelease | | | |
| Oscar | PC | | Original | | | |
| Overwatch | PC | | Origins Edition, Legendary Edition |  | 73052101EU | |
| Outcast (Disc 1) | PC | | Limitierte Sonderausgabe | | OUTCAPC520/A1 | |
| Onimusha 3 | PC | | Original | | 5004561 | |
| Outlive | PC | 1.01 | Original | | | |
| Outcast (Disc 1) | PC | | Play the Games Vol. 3 | | | |
| Outcast (Disc 2) | PC | | Play the Games Vol. 3 | | | |
| The Operative: No One Lives Forever (Disc 2) | PC | 1.0 | Original | | FXX08903223D2 | |
| The Operative: No One Lives Forever (Disc 1) | PC | 1.004 | Game of the Year Edition (BestSeller Series) | | S0026178 | |
| Outlaws (Disc 1) | PC | 2.0 | Rerelease | | 9511830 | |
| Outlaws (Disc 2) | PC | 2.0 | Rerelease | | 9511831 | |
| Odell Down Under | PC | | Original, SoftKey | | POD544AE-CD | |
| Obscure
ObsCure | PC | | Original | | 71902134 | |
| Oregon Trail II | PC | 1.0 | Original | | | |
| Oddworld: Abe's Oddysee | PC | 2.0 | Original | | IB2G-ODDG5 | |
| Oni | PC | 1.0 | Original | | | |
| Outpost | PC | | Original | | S725430 | |
| The Operative: No One Lives Forever (Disc 2)
In the Lounge with No One Lives Forever | PC | 1.0 | Original | | | |
| Oregon Trail II: 25th Anniversary Limited Edition | PC | 1.3 | Original, SoftKey | | #OTR744AE-CD | |
| The Oregon Trail 5th Edition: Adventures Along the Oregon Trail | PC | 1.1 | Rerelease, Southwestern School Set | | 380859B-CD | |
 | Operacja Pustynny Grom / The Partners | PC | | Covermount | | | |
| Oni | PC | 1.0 | Original | | | |
| Outpost 2: Divided Destiny | PC | 1.2.0.5 | Original | | | |
 | Operation Flashpoint: Dragon Rising | PC | 1.0 | Original | | MOFP2CDEU00 | |
| Operation Flashpoint: Resistance | PC | 1.75 | Original | | MOFRCDEU00 | |
| Operation Flashpoint: Red River | PC | 1.0 | Original | | MOFP3CDEU00 | |
 | Orgaslave (Side-1)
オルガスレイブ | PC | | Original | | H PT 003-1 | |
| Orgaslave (Side-2)
オルガスレイブ | PC | | Original | | H PT 003-2 | |
| Odium
ōdi·um | PC | | Original | | CD-W58-1104-0 | |
| The Official Guide to Babylon 5
The Official Guide to J. Michael Straczynski's Babylon 5 | PC | | Original | | | |
| Official Formula 1 Racing | PC | | Original | | | |
 | Oddworld: Abe's Exoddus (Installazione) | PC | 1.0 | Replay | | ABEXPCREI/A1 | |
| Oddworld: Abe's Exoddus (Gioco) | PC | 1.0 | Replay | | ABEXPCREI/A2 | |
| Omikron: The Nomad Soul (Disc 1) | PC | 1.0 | Original | | | |
| Omikron: The Nomad Soul (Disc 2) | PC | 1.0 | Original | | | |
| Omikron: The Nomad Soul (Disc 3) | PC | 1.0 | Original | | | |
