| Region | Title | System | Version | Edition | Languages | Serial | Status |
|---|
 | NYR: New York Race | PC | | Original |       | NYR 001 - CD, NYR 019 - CD | ![2 and more dumps from original media [!]](/images/status/green.png "2 and more dumps from original media [!]") |
 | O.D.T. | PC | | Original | | | |
| Obsidian (Disc 1) | PC | | Original | | | |
| Obsidian (Disc 2) | PC | | Original | | | |
| Obsidian (Disc 3) | PC | | Original | | | |
| Obsidian (Disc 4) | PC | | Original | | | |
| Obsidian (Disc 5) | PC | | Original | | | |
 | 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 | |
| Oddballz: Your Wacky Computer Petz | PC | 1.0 | Original | | CS090370 | |
| 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 (Installazione) | PC | 1.0 | Replay | | ABEXPCREI/A1 | |
| Oddworld: Abe's Exoddus (Gioco) | PC | 1.0 | Replay | | ABEXPCREI/A2 | |
| Oddworld: Abe's Exoddus (Play) | PC | | Original | | 04-15993CD2 | |
| 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 | Original | | 04-12608CD | |
| Odell Down Under | PC | | Original, SoftKey | | POD544AE-CD | |
| Odium
ōdi·um | PC | | Original | | CD-W58-1104-0 | |
| ODS Robot Challenge | PC | 5.0.1r26 | Teacher's Edition | | | |
| Odyssey: The Search for Ulysses (Disc 1) | PC | | Original | | ODY-ENCD1 | |
| Odyssey: The Search for Ulysses (Disc 2) | PC | | Original | | ODY-ENCD2 | |
| 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 | |
 | Omar Sharif Bridge | PC | 1.0 | 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 | | | |
| 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 | | | |
| Ominous Horizons
Ominous Horizons: A Paladin's Calling | PC | 1.0 | Original | | | |
 | One Must Fall 2097
One Must Fall | PC | | Covermount | | D.L.: M-8684-97 | |
| One Unit Whole Blood | PC | 1.21 | Original | | 04-16459CD1 | |
| Open Season (Disc 1) | PC | 1.00 | Original |  | 5004904-CD 1 | |
 | Open Season (Disc 2) | PC | 1.00 | Original | | 5004904-CD 2 | |
| Open Season (Disc 3) | PC | 1.00 | Original | | 5004904-CD 3 | |
| Operation Flashpoint: Cold War Crisis | PC | 1.0 | Original, Gold Edition | | MOPFCDEU00 | |
 | Operation Flashpoint: Cold War Crisis | PC | | The Games Collection | | | |
| Operation Flashpoint: Cold War Crisis | PC | 1.0 | Original | | MOPFCDUS00 | |
| Operation Flashpoint: Gold Upgrade | PC | 1.30 | Original | | MOFUCDUS00 | |
 | Operation Flashpoint: Gold Upgrade | PC | 1.30 | Original, Gold Edition | | MOFUCDEU00, MOFUCDUS00 | |
 | Operation Flashpoint: Holodnaja vojna
Операция Flashpoint: Холодная война | PC | 1.46 | Original |  | | |
| Operation Flashpoint: Resistance | PC | 1.75 | Original | | MOFRCDEU00 | |
| Operation Flashpoint: Resistance | PC | 1.75 | Original | | MOFRCDUS00 | |
| The Operative: No One Lives Forever (Disc 1) | PC | 1.0 | Original |  | FXX08903223D1 | |
| The Operative: No One Lives Forever (Disc 2) | PC | 1.0 | Original | | FXX08903223D2 | |
| The Oregon Trail 3rd Edition: Pioneer Adventures (Disc 1) | PC | 1.0 | Original | | OTA744AE-CD1 | |
| 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 | |
| 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 | 1.0 | Original | | 380859-CD | |
| The Oregon Trail 5th Edition: Adventures Along the Oregon Trail | PC | 1.1 | Rerelease, Southwestern School Set | | 380859B-CD | |
| Oregon Trail II | PC | 1.3 | Smart Saver | | 381032-CD/i401ha | |
| Oregon Trail II | PC | 1.31 | Rerelease | | HCD744BE-CD | |
| Oregon Trail II | PC | 1.31 | Rerelease | | #HCD744AE-CD | |
| Oregon Trail II: 25th Anniversary Limited Edition | PC | 1.3 | Original, SoftKey | | #OTR744AE-CD | |
| The Oregon Trail | PC | 1.2 | Original | | #HCD706 | |
| The Oregon Trail | PC | 1.2 | Original | | #HCD706 | |
| Die Original Moorhuhn Jagd | PC | | Best of Moorhuhn | | | |
 | Oudou Yuusha
王道勇者 | PC | | Original |  | ALS-0029 | |
| Outlaws: Die Gesetzlosen (Disc 1) | PC | 1.1 | Rerelease | | | |
| Outlaws: Die Gesetzlosen (Disc 2) | PC | 1.1.1 | Rerelease | | | |
| Outpost 2: Divided Destiny | PC | 1.2.0.5 | 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 | | Dice | | DCG 005752, DMM 005776 | |
| Overboard! | PC | | Original | | | |
| P-Slider | PC | 6.20.1.0 | Original |     | dex007 | |
| P.K.'s Place 4: Daphne and the Seventh Wonder | PC | 2.0 | Original | | | |
| Pac-Man All-Stars | PC | 1.0 | Original | | Part # 23529CD | |
| 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 | |
 | Pac-Man: Adventures in Time | PC | 1.0 | Original, Pac-Man Three Pack, Kellogg's LCMs | | 22450CD, Part # 22450CD, Product # 99179 | |
| Pachinko da yo Daiku no Gen-san
パチンコ実機攻略シリーズ ＣＲ大工の源さん | PC | 1.00 | Original | | PDG-019-2 | |
| Pacific Fighters (Disc 1) | PC | 3.0 | Original | | 682073-CD1 | |
| Pacific Fighters (Disc 1) | PC | 3.0 | The Ultimate Flight Collection | | 782742-CD1 | |
| Pacific Fighters (Disc 2) | PC | 3.0 | Original | | 682073-CD2 | |
| Painkiller | PC | DPV1.0 | Demo | | PCO482CD | |
| 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 | | Original | | PCO427CD | |
| Painkiller: Battle out of Hell (Disc 2) | PC | | Original | | PCO427CD | |
| Painkiller: Heaven's Got a Hitman
PK Retail Demo | PC | SSV 1.0 | Exclusive Retail Demo, Exclusive Sales Associate Demo | | PKRD2004 | |
| Painkiller: Heaven's Got a Hitman (Disc 3) | PC | | Original | | PCO391CD, PCO391CD3 | |
 | Painkiller: Heaven's Got a Hitman (Disc 1) | PC | 1.0 | Original | | PCO391CD, PNKRCD1ASIA, PNKRCD1EN | |
| Painkiller: Heaven's Got a Hitman (Disc 2) | PC | 1.0 | Original | | PCO391CD, PCO391CD2, PNKRCD2ASIA, PNKRCD2EN | |
| Painkiller: Heaven's Got a Hitman (Disc 3) | PC | 1.0 | Original | | PCO391CD, PNKRCD3ASIA, PNKRCD3EN | |
