| Region | Title | System | Version | Edition | Languages | Serial | Status |
|---|
 | Obitel' T'my
Обитель Тьмы | PC | 5.02 04/07/03 | Original |  | |  |
| Obitaemyj ostrov: Zemlyanin
Обитаемый остров: Землянин | PC | | Original | | | |
| Obitaemyj ostrov: Chuzhoj sredi chuzhix
Обитаемый остров: Чужой среди чужих | PC | | Original | | | |
| Obitaemyj ostrov
Обитаемый остров | PC | | Original | | | |
| Ob"ekt 69: Mest' Krassera
Объект 69: Месть Крассера | PC | | Original | | | ![2 and more dumps from original media [!]](/images/status/green.png "2 and more dumps from original media [!]") |
| Ob"ekt 69: Kasablanka
Объект 69: Касабланка | PC | | Original | | RUSSOBIT-M 2003/408 | |
 | O'boy-jakten | PC | | Original |  | | |
 | O.R.B: Off-World Resource Base | PC | 1.0 | Original |  | 22434CD | |
 | O.D.T. | PC | | Original |  | | |
 | O.D.T. | PC | | Original | | | |
 | O Xephteris Taxideuei stin Ellada
Ο Ξεφτέρης ταξιδεύει στην Ελλάδα | PC | | Original |  | | |
| Obsidian (Disc 5) | PC | | Original, Complimentary Copy | | 11008 | |
| Obsidian (Disc 4) | PC | | Original, Complimentary Copy | | 11008 | |
| Obsidian (Disc 3) | PC | | Original, Complimentary Copy | | 11008 | |
| Obsidian (Disc 2) | PC | | Original, Complimentary Copy | | 11008 | |
| Obsidian (Disc 1) | PC | | Original, Complimentary Copy | | 11008 | |
 | The Orange Box (Disc 2) | PC | | Original, EA Classics |         | VAE07705811D2/ENG, VAE07707118D2/ENG, VAX07705811D2, VAX07705811D2/AUS | |
 | The Orange Box (Disc 1) | PC | | Original, EA Classics | | 985207, VAE07705811D, VAE07705811D/ENG, VAE07707118D/ENG, VAX07705811D/AUS | |
| Operation Flashpoint: Gold Upgrade | PC | 1.30 | Original, Gold Edition | | MOFUCDEU00, MOFUCDUS00 | |
| Operation Flashpoint: Cold War Crisis | PC | 1.0 | Original, Gold Edition | | MOPFCDEU00 | |
| Oregon Trail II: 25th Anniversary Limited Edition | PC | 1.3 | Original, SoftKey | | #OTR744AE-CD | |
| Odell Down Under | PC | | Original, SoftKey | | POD544AE-CD | |
 | Overwatch | PC | | Origins Edition |  | | |
| Overwatch | PC | | Origins Edition | | 052429 | |
 | Oni | PC | 1.0 | PC Best Buy | | 177588 | |
| Outcast (Disc 2) | PC | | Play the Games Vol. 3 | | | |
| Outcast (Disc 1) | PC | | Play the Games Vol. 3 | | | |
| Operation Flashpoint: Cold War Crisis | PC | | Playable Demo | | POPFCDUS40 | |
 | O! Rety! Psoty Dudusia Wesołka | PC | | Playada Gier | | P_20265_03A_PL | |
| Official Lara Croft: Real Life '99 Lara: Character Images | PC | | Press Kit | | | |
 | Oct 15 2002 | PC | | Press Kit | | | |
| Overlord II | PC | | Preview Code |   | | |
| Omikron: The Nomad Soul | PC | | Promo | | | |
| Ocean Jewels | PC | | Red Rocks | | | |
 | Oddworld: Abe's Exoddus (Installazione) | PC | 1.0 | Replay | | ABEXPCREI/A1 | |
| Oddworld: Abe's Exoddus (Gioco) | PC | 1.0 | Replay | | ABEXPCREI/A2 | |
| Operation: Surgery Has Never Been so Silly! | PC | | Replay Kids | | OPERPCREGB/A | |
| Oz: The Magical Adventure | PC | 7.0.0.198 | Rerelease | | 92785 | |
| Outpost | PC | 1.1 | Rerelease | | S725431 | |
| Outlaws (Disc 2) | PC | 2.0 | Rerelease | | 9511831 | |
| Outlaws (Disc 2) | PC | 2.0 | Rerelease | | 9511831 | |
| Outlaws (Disc 2) | PC | 2.0 | Rerelease | | 9511831 | |
| Outlaws (Disc 1) | PC | 2.0 | Rerelease | | 9511830 | |
| Outlaws (Disc 1) | PC | 2.0 | Rerelease | | 9511830 | |
| Outlaws (Disc 1) | PC | 2.0 | Rerelease | | 9511830 | |
| Outlaws (Disc 2) | PC | 1.1 | Rerelease | | | |
| Outlaws (Disc 1) | PC | 1.1 | Rerelease | | | |
| Out of This World | PC | | Rerelease | | CD-MMC-023-0 | |
| Oregon Trail II | PC | 1.32 | Rerelease | | #HCD744CE-CD | |
| Oregon Trail II | PC | 1.31 | Rerelease | | #HCD744AE-CD | |
| Oregon Trail II | PC | 1.31 | Rerelease | | HCD744BE-CD | |
| The Oregon Trail 4th Edition (Disc 3) | PC | 1.1 | Rerelease | | OTF744BE-CD3 | |
| The Oregon Trail 4th Edition (Disc 2) | PC | 1.1 | Rerelease | | OTF744BE-CD2 | |
| The Oregon Trail 4th Edition (Disc 2) | PC | 1 | Rerelease | | OTF744CE-CD2 | |
| The Oregon Trail 4th Edition (Disc 1) | PC | 1.1 | Rerelease | | OTF744BE-CD1 | |
| The Oregon Trail 3rd Edition: Pioneer Adventures (Disc 1) | PC | 1.2 | Rerelease | | OTA744BE-CD1 | |
| The Orange Box (Disc 2) | PC | 4295 / 4539 | Rerelease |       | | |
| The Orange Box (Disc 2) | PC | | Rerelease | | | |
| The Orange Box (Disc 1) | PC | 4295 / 4539 | Rerelease | | | |
| The Orange Box (Disc 1) | PC | | Rerelease | | | |
| Optimum Resource Sampler | PC | | Rerelease | | | |
 | One Must Fall 2097
One Must Fall | PC | | Rerelease | | D.L.: M-8684-97 | |
| Outpost | PC | 1.5 | Rerelease, Sierra Originals | | | |
| The Oregon Trail 5th Edition: Adventures Along the Oregon Trail | PC | 1.1 | Rerelease, Southwestern School Set | | 380859B-CD | |
| OverKill | PC | | ROMWARE | | ROM 10 007 | |
| One Must Fall 2097
One Must Fall 2097 CD-ROM | PC | 1.1 | ROMWARE | | ROM 10017 | |
| Off Limits: Mizar | PC | | ROMWARE | | ROM 10120 | |
| Off Limits: Cassiopeia | PC | | ROMWARE | | ROM 10100 | |
| The Oregon Trail 5th Edition: Adventures Along the Oregon Trail | PC | 1.0 | Scholastic | | 380859-CD WP2 | |
| Outpost | PC | 1.51 | Schweinepreise | | S390122CZ12ZZ | |
| OutRun 2006: Coast 2 Coast | PC | 1.00.0000 | Serie Maxima II | | SEGA-PC029 | |
| Outpost 2: Divided Destiny | PC | | SierraOriginals | | | |
| Outpost | PC | | SierraOriginals | | S4941220Z12Z2 | |
| The Oregon Trail | PC | 3.0.1 | Slash | | CDRM1239790 | |
| The Oregon Trail | PC | 1.22 | Smart Saver | | ORT844AE-CD | |
| Oregon Trail II | PC | 1.3 | Smart Saver | | 0TT744AE-CD | |
| Oregon Trail II | PC | 1.3 | Smart Saver | | 381032-CD/i401ha | |
| The Oregon Trail: Classic Edition | PC | 3.0.1 | SoftKey | | POT144CE-CD | |
| The Oregon Trail: Classic Edition | PC | | SoftKey | | POT144BE-CD | |
| The Oregon Trail: Classic Edition | PC | | SoftKey | | POT144EE-CD | |
| Obscure
ObsCure | PC | | Software Pyramide | | | |
| Outlaw Racers | PC | | Sold Out Software | | | |
| Operation: Surgery Has Never Been so Silly! | PC | | Sold Out Software | | | |
| Operation Flashpoint: Cold War Crisis | PC | 1.46 | Sold Out Software | | | |
| Operation Flashpoint: Cold War Crisis | PC | 1.46 | Sold Out Software | | | |
| The Original Links | PC | | Solid Gold Edition | | | |
 | Oblivious Garden: Carmina Burana (Disc 2) (Music Disc) | PC | | Standard Edition | | | |
| Oblivious Garden: Carmina Burana (Disc 1) (Game Disk) | PC | 1.0 | Standard Edition | | | |
 | Otome Koigokoro Prister
乙女恋心プリスター体験版 | PC | | Taikenban | | | |
| Osananajimi wa Pet Yakuza!
幼なじみはペットヤクザ！体験版 | PC | | Taikenban | | | |
| Opera Fatal | PC | | Tandem | | 1444 | |
| ODS Robot Challenge | PC | 5.0.1r26 | Teacher's Edition | | | |
| ODS Carnival Math | PC | 5.0r134 | Teacher's Edition | | | |
| ODS Carnival Math | PC | 5.0r134 | Teacher's Edition | | | |
| ODS Amazing Art Corner | PC | 5.0r134 | Teacher's Edition | | | |
| ODS Air Explorer | PC | 5.0r134 | Teacher's Edition | | | |
| ODS Air Explorer | PC | 5.0r134 | Teacher's Edition | | | |
| Operation Neptune | PC | 1.23 | The ClueFinders: Math Ages 9-12 | | ONT744EE-CD | |
 | Operation Flashpoint: Cold War Crisis | PC | | The Games Collection | | | |
| 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 | 2.1 | The Smile Edition | | CDR3016 | |
 | OutRun 2006: Coast 2 Coast | PC | | Top Games | | SEGA-PC029 | |
| 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 | | | |
| Out of This World | PC | | Valueware | | CD-ICD-142-0 | |
| Omar Sharif on Bridge | PC | | Valueware | | CD-ICD-148-0 | |
| OutRun 2006: Coast 2 Coast | PC | | White Label | | 1673A | |
 | The Operational Art of War II | PC | 1.01.02 | Xplosiv | | EI-1259-3 | |
