| Region | Title | System | Version | Edition | Languages | Serial | Status |
|---|
 | Omikron: The Nomad Soul (Disc 3) | PC | 1.0 | Original |  | | ![2 and more dumps from original media [!]](/images/status/green.png "2 and more dumps from original media [!]") |
| Ominous Horizons
Ominous Horizons: A Paladin's Calling | PC | 1.0 | Original | | | |
| One Unit Whole Blood | PC | 1.21 | Original | | 04-16459CD1 | |
| Oni | PC | 1.0 | Original | | | |
| Operation | PC | | General Mills | | AM801R5 | |
| Operation Flashpoint: Cold War Crisis | PC | 1.0 | Original | | MOPFCDUS00 | |
| Operation Flashpoint: Gold Upgrade | PC | 1.30 | Original | | MOFUCDUS00 | |
| Operation Flashpoint: Resistance | PC | 1.75 | Original | | MOFRCDUS00 | |
| The Operational Art of War: Century of Warfare | PC | | Original | | | |
 | The Operative: No One Lives Forever (Disc 1) | PC | 1.004 | Game of the Year Edition (BestSeller Series) | | S0026178 | |
 | 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 1) | PC | 1.0.0.4 | Game of the Year Edition (Covermount) | | | |
| The Operative: No One Lives Forever (Disc 1) | PC | 1.0 | Original | | | |
| The Operative: No One Lives Forever (Disc 1) | PC | 1.004 | Game of the Year Edition | | | |
| The Operative: No One Lives Forever (Disc 2)
In the Lounge with No One Lives Forever | PC | 1.0 | Original | | | |
 | 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 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 | 1.0 | Original | | | |
| Oregon Trail II | PC | 1.3 | Smart Saver | | 381032-CD/i401ha | |
| 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 | |
| The Original Links | PC | | Solid Gold Edition | | | |
| Oscar | PC | | Original | | | |
| Oscar | PC | | Jackson Libri | | | |
| Outcast (Disc 1) | PC | | Original | | OUTCAPC52G/A1 | |
| Outcast (Disc 2) | PC | | Original | | OUTCAPC52G/A2 | |
| Outcast (Disc 1) | PC | | Original | | 42831-9110TC | |
| Outlaws (Disc 1) | PC | 1.0 | Original | | 9511830 | |
| Outlaws (Disc 1) | PC | 2.0 | LucasArts Classics | | 3000009.101.UK | |
| Outlaws (Disc 2) | PC | 1.0 | Original | | 9511831 | |
| Outlaws (Disc 2) | PC | 2.0 | LucasArts Classics | | 3000009.102.UK | |
| Outlaws (Disc 1) | PC | | Original | | | |
| Outlaws (Disc 2) | PC | | Original | | | |
 | Outlaws (Disc 1) | PC | 1.0 | Original | | | |
| Outlaws (Disc 2) | PC | 1.0 | Original | | | |
| Outlaws (Disc 1) | PC | 1.0 Build 3 | Bundle Version Diamond OEM | | 644430 | |
| Outlaws (Disc 1) | PC | 2.0 | Rerelease | | 9511830 | |
| Outlaws (Disc 1) | PC | 2.0 | Rerelease | | 9511830 | |
| Outlaws (Disc 2) | PC | 2.0 | Rerelease | | 9511831 | |
| Outlaws (Disc 2) | PC | 2.0 | Rerelease | | 9511831 | |
 | 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 | |
| Outlive | PC | 1.01 | Original | | | |
| Outpost | PC | | Original | | S725430 | |
| Outpost | PC | 1.5 | Rerelease, SierraOriginals | | | |
| Outpost 2: Divided Destiny | PC | 1.2.0.5 | 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 | |
| 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 | |
| Owlboy | PC | 0.0.6152.604 | IndieBox | | | |
| P.K.'s Place 1: Party on the Patio! | PC | 2.0 | Original | | | |
| 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: Adventures in Time | PC | 1.0 | Original, Pac-Man Three Pack, Kellogg's LCMs | | 22450CD, Part # 22450CD, Product # 99179 | |
| 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: Black Edition | PC | 1.6 | Original | | | |
| Painkiller: Black Edition | PC | 1.6 | Limited Edition DVD | | DVD840CD | |
| Painkiller: Complete Collection (Disc 1)
Painkiller Collection | PC | | Original | | | |
| Painkiller: Complete Collection (Disc 2)
Painkiller Collection | PC | | Original | | | |
| Painkiller: Heaven's Got a Hitman (Exclusive Alienware Customer Demo) | PC | 0.93a | | | | |
| 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 | |
| Painkiller: Overdose | PC | 75.3 | Original | | DVD542CD | |
| 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 3: You Are What You Eat from Your Head to Your Feet | PC | 1.0 | Original | | 04-19100CD | |
| Pajama Sam: Games to Play on Any Day | PC | | Original | | Part # 04-22971CD | |
| Pajama Sam: No Need to Hide When It's Dark Outside
Pajama Sam in "No Need to Hide When It's Dark Outside" | PC | 1.0 | Original, Rerelease | | 04-00000H1376, 22013031, PETT 992635 | |
| Pandemonium 2 | PC | | Original | | | |
| Pandemonium 2 | PC | | Gold Games 4 (CD 15) | | SPI 061 | |
| Pandemonium! | PC | | Original | | 76896-427342 | |
| The Pandora Directive (Disc 1) | PC | | Tex Murphy Double Feature | | | |
| The Pandora Directive (Disc 1) | PC | 1.0 | Original | | | |
| The Pandora Directive (Disc 2) | PC | 1.0 | Original | | | |
| The Pandora Directive (Disc 3) | PC | 1.0 | Original | | | |
| The Pandora Directive (Disc 4) | PC | 1.0 | Original | | | |
| The Pandora Directive (Disc 5) | PC | 1.0 | Original | | | |
| The Pandora Directive (Disc 6) | PC | 1.0 | Original | | | |
| Pandora's Box | PC | 1.0a | Ubisoft eXclusive, Kolekcja Klasyki Komputerowej | | | |
