| Region | Title | System | Version | Edition | Languages | Serial | Status |
|---|
 | Obduction | MAC | | Kickstarter | | |  |
| Obduction | PC | 1.4.2 | Kickstarter |        | | |
 | Obitaemyj ostrov
Обитаемый остров | PC | | Original | | | |
| Obitaemyj ostrov: Chuzhoj sredi chuzhix
Обитаемый остров: Чужой среди чужих | PC | | Original | | | |
| Obitaemyj ostrov: Zemlyanin
Обитаемый остров: Землянин | PC | | Original | | | |
| Obitel' t'my: Sumerki
Обитель тьмы: Сумерки | PC | 1.1 | Original | | | |
 | Oblivious Garden: Carmina Burana (Disc 1) (Game Disk) | PC | 1.0 | Standard Edition |  | | |
| Obratnyj otschet
Обратный отсчет | PC | v.1 1.06.10.22 | Original | | | ![2 and more dumps from original media [!]](/images/status/green.png "2 and more dumps from original media [!]") |
 | Obscure
ObsCure | PC | | Original | | | |
 | Obscure
ObsCure | PC | | Software Pyramide | | | |
| Obscure
ObsCure | PC | | Best of Atari | | | |
 | Obscure
ObsCure | PC | 1.1 | Covermount | | | |
| Obscure II
ObsCure II | PC | | Original | | | |
| Obscure II
ObsCure II | PC | 1.0 | Covermount | | | |
| Obscure II
ObsCure II | PC | 1.0.0.0 | Original | | | |
| Obscure: The Aftermath
ObsCure: The Aftermath | WII | | Beta | | | |
| Obscure: The Aftermath
ObsCure: The Aftermath | PC | | Original | | | |
| Ocean Depths | AJCD | | Unlicensed (CD-R) | | | |
| Oddworld: Abe's Origins | PC | | Limited Run Games | | | |
 | Of Orcs and Men | PC | | Original | | | |
| Official Sega Dreamcast Magazine Vol. 11: February 2001 | DC | 0.500 | | | | |
| Official Sega Dreamcast Magazine Vol. 5: May 2000 | DC | 1.010 | | | | |
| Oficery: Special'noe izdanie
Офицеры: Специальное издание | PC | 1.18.2 | Original | | | |
| Oil Rush | PC | | Original | | | |
| Ōkami | WII | | Beta | | | |
| OMSI 2 | PC | 2.2.032 | Original | | | |
| OMSI Add-on: Wien: Der Hochflurbus LU 200 | PC | 1.0 | OMSI Bundle | | | |
| OMSI: Der Omnibussimulator | PC | 1.04 | OMSI Bundle | | | |
| Onible'jd
Ониблэйд | PC | | Original | | | |
| Onimusha: Put' samuraja
Onimusha: Путь самурая | PC | | Original | | | |
| OnlineGamez | PC | | | | | |
 | Only One 3in1
オンリーワン ３ｉｎ１ | PC | | PC Game Bundle |  | | |
| Onslaught | WII | | Beta | | | |
| Open Season | PS2 | 1.01 | Review |      | | |
| Opera House Preview Disc #2
オペラハウス プレビューディスク ＃２ | PC | | Original | | | |
| Opera House Preview Disc #2.3
オペラハウス プレビューディスク ＃２．３ | PC | | Original | | | |
| Operaciya Bagration
Операция Багратион | PC | | Original | | | |
 | Operation Thunderstorm | PC | 1.0 | Original | | | |
 | Opowieści z Narnii: Książe Kaspian | PC | | Covermount | | | |
| The Orange Box (Disc 1) | PC | | Rerelease | | | |
| The Orange Box (Disc 1) | PC | | Original |    | | |
| The Orange Box (Disc 1) | PC | 4295 / 4539 | Rerelease |    | | |
| The Orange Box (Disc 2) | PC | | Rerelease | | | |
| The Orange Box (Disc 2) | PC | | Original | | | |
| The Orange Box (Disc 2) | PC | 4295 / 4539 | Rerelease | | | |
| Orcs Must Die! | PC | | Original | | | |
| Order of War: Osvobozhdenie
Order of War: Освобождение | PC | | Igromaniya: Vybor redakcii | | | |
| Order of War: Stolknovenie
Order of War: Столкновение | PC | | Igromaniya: Vybor redakcii | | | |
| Order Up! | WII | | Beta | | | |
 | Ori and the Blind Forest: Definitive Edition | PC | 5.3.2.9582331 | Original, Limited Edition | | | |
| Osada Avalona (Disc 1)
Осада Авалона | PC | | | | | |
| Osada Avalona (Disc 2)
Осада Авалона | PC | | | | | |
| Ost-Indskaya kompaniya: Zolotoe izdanie
Ост-Индская компания: Золотое издание | PC | | Original | | | |
| Ougon Musou Kyoku Cross
黄金夢想曲 ＣＲＯＳＳ | PC | 2.00 | Original | | | |
| Ousama Monogatari
王様物語 | WII | | Beta | | | |
| Outcast | PC | | DVD-ROM | | | |
| OutRun 2 | XBOX | | Beta | | | |
| Overclocked: Una Storia di Violenza | PC | 1.1 | Original | | | |
 | Overlord
BGamer 153 (Side A) | PC | | Covermount | | | |
| Overlord | PC | 1.2 | Original | | | |
 | Overlord | XBOX360 | | Beta | | | |
| Overlord | XBOX360 | | Beta | | | |
| Overlord II | PC | | Original | | | |
| Overlord II | PC | | Preview Code |  | | |
| Overlord II | XBOX360 | | Beta | | | |
| Overlord: Raising Hell | PC | 1.3 | Original | | | |
| Overspeed: High Performance Street Racing | PC | | Original | | | |
| Owlboy | PC | 0.0.6152.604 | IndieBox | | | |
| Oyungezer: Mart 2010 | PC | | | | | |
| Overwatch | PC | | Origins Edition | | 052429 | |
| Outward | PC | | Day One Edition | | 1024669LAINT, 103699 | |
| ON! DVD: On!ine Powerpak: Special Issue 1 | PC | | Original | | 123490 | |
| OutRun 2006: Coast 2 Coast | PC | | GSP White Label: Reload | | 1673A | |
| OutRun 2006: Coast 2 Coast | PC | | White Label | | 1673A | |
| Onimusha 3 | PC | | Original | | 5004561 | |
| Outtrigger | DC | 1.003 | Original | | 51102 | |
| Ooga Booga | DC | 1.001 | Original | | 51140 | |
| Obscure
ObsCure | PC | 1.0 | Original | | 719 02 102 | |
| Obscure
ObsCure | PC | | Original | | 71902134 | |
 | Obscure | PC | | Back 2 Games | | 71902134 | |
| Overwatch | PC | | Game of the Year Edition, Legendary Edition | | 73052010US, S7302210 | |
| Overwatch | PC | | Origins Edition, Legendary Edition | | 73052101EU | |
| Oz: The Magical Adventure | PC | 7.0.0.198 | Rerelease | | 92785 | |
 | The Orange Box (Disc 1) | PC | | Original, EA Classics | | 985207, VAE07705811D, VAE07705811D/ENG, VAE07707118D/ENG, VAX07705811D/AUS | |
| The Orange Box (Disc 2) | PC | | Original | | 985217 | |
| Oddworld: Abe's Exoddus (Gioco) | PC | 1.0 | Replay | | ABEXPCREI/A2 | |
| Ougon Musou Kyoku X
黄金夢想曲X | XBOX360 | | Original | | AJ-2003 | |
| Operation Darkness | XBOX360 | | Original | | AT-2002 | |
| Official PlayStation Magazine Issue 07: July 2007 | PS3 | 01.00 | | | BCED - 000 … | |
| Official PlayStation Magazine Issue 09: September 2007 | PS3 | 01.00 | | | BCED - 000 … | |
| Official PlayStation Magazine Issue 08: August 2007 | PS3 | 01.00 | | | BCED-00084 | |
| Official PlayStation Magazine Issue 10: October 2007 | PS3 | 01.00 | | | BCED-00086 | |
| Official PlayStation Magazine Issue 11: November 2007 | PS3 | 01.02 | | | BCED-00087 | |
| Official PlayStation Magazine Issue 12: December 2007 | PS3 | 01.00 | | | BCED-00088 | |
| Official PlayStation Magazine Issue 13: Christmas 2007 | PS3 | 01.00 | | | BCED-00181 | |
| Official PlayStation Magazine Issue 14: January 2008 | PS3 | 01.00 | | | BCED-00202 | |
| Official PlayStation Magazine Issue 15: February 2008 | PS3 | 01.01 | | | BCED-00203 | |
| Official PlayStation Magazine Issue 16: March 2008 | PS3 | 01.01 | | | BCED-00204 | |
| Official PlayStation Magazine Issue 17: April 2008 | PS3 | 01.00 | | | BCED-00205 | |
| Official PlayStation Magazine Issue 18: May 2008 | PS3 | 01.00 | | | BCED-00206 | |
