| Region | Title | System | Version | Edition | Languages | Serial | Status |
|---|
 | Obsidian (Disc 5) | PC | | Original |  | | ![2 and more dumps from original media [!]](/images/status/green.png "2 and more dumps from original media [!]") |
 | Obsidian (Disc 1) | PC | | Original, Complimentary Copy |  | 11008 | |
| Obsidian (Disc 2) | PC | | Original, Complimentary Copy | | 11008 | |
| Obsidian (Disc 3) | PC | | Original, Complimentary Copy | | 11008 | |
| Obsidian (Disc 4) | PC | | Original, Complimentary Copy | | 11008 | |
| Obsidian (Disc 5) | PC | | Original, Complimentary Copy | | 11008 | |
| Oddworld: Abe's Exoddus (Play) | PC | | Original | | 04-15993CD2 | |
| Odell Down Under | PC | | Original, SoftKey | | POD544AE-CD | |
| Odium
ōdi·um | PC | | Original | | CD-W58-1104-0 | |
 | Odyssey: The Search for Ulysses (Disc 1) | PC | | Original | | ODY-ENCD1 | |
| Odyssey: The Search for Ulysses (Disc 2) | PC | | Original | | ODY-ENCD2 | |
| Official Formula 1 Racing | PC | | Original |    | | |
| The Official Guide to Babylon 5
The Official Guide to J. Michael Straczynski's Babylon 5 | PC | | Original | | | |
| Official Sega Dreamcast Magazine: Special Edition Preview PC CD-ROM | PC | | | | | |
| Ohio Distinctive Software Vol. I | PC | | | | | |
 | Oksfordzka Encyklopedia Historii Świata | PC | | Covermount |  | SELL 0103 | |
 | Olympic Soccer | PC | | CD-ROM Classic Collection 2 | | | |
 | One Must Fall 2097
One Must Fall | PC | | Covermount | | D.L.: M-8684-97 | |
| Onimusha 3 | PC | | Original | | 5004561 | |
| Open Kart | PC | | I Videogiochi del "Giornalino" | | | |
 | Operaciya "Plastilin" (Disc 1)
Операция "Пластилин" | PC | | 1C: Kollekciya igrushek |  | | |
| Operaciya "Plastilin" (Disc 2)
Операция "Пластилин" | PC | | 1C: Kollekciya igrushek | | | |
| Operacja Pustynny Grom / The Partners | PC | | Covermount | | | |
| Operation | PC | | General Mills | | AM801R5 | |
 | Operation Flashpoint: Cold War Crisis | PC | | The Games Collection | | | |
| Operation Flashpoint: Dragon Rising | PC | | Original | | MOFP2CDEU00 | |
| The Operational Art of War: Century of Warfare | PC | | Original | | | |
| The Operative: No One Lives Forever (Disc 1) | PC | | Game of the Year Edition | | | |
| The Orange Box (Disc 1) | PC | | Original |      | VAX07705811D | |
| The Orange Box (Disc 1) | PC | | Original, EA Value Games | | VAD07705811D | |
| The Orange Box (Disc 2) | PC | | Original, EA Value Games | | VAD07705811D2 | |
| The Orange Box (Disc 1) | PC | | Original | | VAI07705811D | |
| The Orange Box (Disc 2) | PC | | Original | | VAI07705811D2 | |
| 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 | |
 | The Orange Box (Disc 2) | PC | | Original, EA Classics | | VAE07705811D2/ENG, VAE07707118D2/ENG, VAX07705811D2, VAX07705811D2/AUS | |
| The Oregon Trail 3rd Edition: Pioneer Adventures (Disc 2) | PC | | Original | | OTA744AE-CD2 | |
| The Oregon Trail 3rd Edition: Pioneer Adventures (Disc 3) | PC | | Original | | OTA744AE-CD3 | |
 | 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 | |
| The Original Links | PC | | Solid Gold Edition | | | |
| Die Original Moorhuhn Jagd | PC | | Best of Moorhuhn | | | |
 | Original War (Disc 1) | PC | | Original, Gamer Collector | | | |
| Original War (Disc 2) | PC | | Original, Gamer Collector | | | |
| Orion Burger | PC | | Gold Games 2 (CD 11) | | SPI 046 | |
| Oscar | PC | | Original | | | |
| Oscar | PC | | Jackson Libri | | | |
| Othello | PC | | Original |  | | |
| Otorva v shkole
Оторва в школе | PC | | Original | | | |
| Otverzhennye: Tajna temnoj rasy (Disc 1)
Отверженные: Тайна темной расы | PC | | 1C: Igrushki | | SNOW OT21 0110 IR | |
| Oudou Yuusha
王道勇者 | PC | | Original | | ALS-0029 | |
| Outcast | PC | | DVD-ROM | | | |
| Outcast (Disc 1) | PC | | Original | | OUTCAPC52G/A1 | |
| Outcast (Disc 2) | PC | | Original | | OUTCAPC52G/A2 | |
| Outcast (Disc 1) | PC | | Play the Games Vol. 3 | | | |
| Outcast (Disc 1) | PC | | Limitierte Sonderausgabe | | OUTCAPC520/A1 | |
| Outcast (Disc 2) | PC | | Play the Games Vol. 3 | | | |
| Outcast (Disc 1) | PC | | Covermount | | | |
| Outcast (Disc 2) | PC | | Covermount | | | |
| Outcast (Disc 1) | PC | | Original | | 42831-9110TC | |
| Outlaws (Disc 1) | PC | | Original | | | |
| Outlaws (Disc 1) | PC | | M6 Multimedia | | M6IMM6 | |
| Outlaws (Disc 2) | PC | | Original | | | |
| Outlaws (Disc 2) | PC | | M6 Multimedia | | M6IMM6 | |
| Outpost | PC | | Original | | S725430 | |
| OutRun 2006: Coast 2 Coast | PC | | Gamer's Choice | | THQ70690 | |
| OutRun 2006: Coast 2 Coast | PC | | eXtra Klasyka XK HIT | | TS OCC PL | |
| OutRun 2006: Coast 2 Coast (Disc 1) | PC | | Original | | | |
| OutRun 2006: Coast 2 Coast (Disc 2) | PC | | Original | | | |
| Outward | PC | | Day One Edition | | 1024669LAINT, 103699 | |
 | Over 10 Tetrix Games | PC | | Original | | | |
| Over 1000 Games: The Complete Encyclopedia of Games (Disc 1) | PC | | Rerelease | | | |
| Over 1000 Games: The Complete Encyclopedia of Games (Disc 2) | PC | | Rerelease | | | |
| Overboard! | PC | | Original | | | |
| Overboard! | PC | | Dice | | DCG 005752, DMM 005776 | |
 | Overlord | PC | | Original | | MOVL1CDEU00 | |
| Overwatch | PC | | Game of the Year Edition, Legendary Edition | | 73052010US, S7302210 | |
| Overwatch | PC | | Origins Edition, Legendary Edition | | 73052101EU | |
| Pac-Man
パックマン | PC | | Ultra 2000/Ultra Series, Yuuyuu Series | | MKW-100 | |
| Pac-Man no Desktop Daisakusen
パックマンのデスクトップ大作戦 | PC | | Original | | NMC2013 | |
| Pac-Man World 2 | PC | | Original | | | |
| Pac-Man: Adventures in Time | PC | | Original, Bundle Version Tiny OEM | | 51384.1020.DL | |
 | Pack 5 Racing Games (Disc 1) | PC | | Original | | | |
| Pack 5 Racing Games (Disc 2) | PC | | Original | | | |
| Painkiller: Battle out of Hell (Disc 1) | PC | | Original | | PKXPMULTICD1 | |
| Painkiller: Battle out of Hell (Disc 2) | PC | | Original | | PKXPMULTICD2 | |
| Painkiller: Battle out of Hell (Disc 1) | PC | | dobra GRA | | | |
| Painkiller: Battle out of Hell (Disc 1) | PC | | Original | | PCO427CD | |
| Painkiller: Battle out of Hell (Disc 2) | PC | | Original | | PCO427CD | |
| Painkiller: Complete Collection (Disc 1)
Painkiller Collection | PC | | Original | | | |
| Painkiller: Complete Collection (Disc 2)
Painkiller Collection | PC | | Original | | | |
| Painkiller: Heaven's Got a Hitman (Disc 3) | PC | | Original | | PCO391CD, PCO391CD3 | |
| Painkiller: Universe (Disc 1) | PC | | Original | | ROPAINOVER0009LAB1 | |
| Painkiller: Universe (Disc 2) | PC | | Original | | ROPAINOVER0009LAB2 | |
| Pajama Sam 2: Thunder and Lightning Aren't So Frightening | PC | | Original | | 04-00000H1678 | |
 | Pajama Sam 2: Thunder and Lightning Aren't So Frightening | PC | | Original | | PETT 201261, Part No. 04-00000H1678 | |
| Pajama Sam: Doe Niet Onder voor Bliksem en Donder!
Pajama Sam 2 | PC | | Original | | | |
| Pajama Sam: Games to Play on Any Day | PC | | Original | | Part # 04-22971CD | |
 | Pajama Sam: Je Bent Wat Je Eet, 'T Is Maar Dat Je Het Weet | PC | | Rerelease | | | |
| Pajama Sam: Je Bent Wat Je Eet, 'T Is Maar Dat Je Het Weet
Pajama Sam 3 | PC | | Original | | | |
