| Region | Title | System | Version | Edition | Languages | Serial | Status |
|---|
 | Omnia Junior 1: Enciclopedia: Dizionario | PC | | Covermount |  | SIAE 08A01PA |  |
| Omnia Junior 2: Storia: Attività interattive | PC | | Covermount | | SIAE 0901PA | |
| Omnia Junior 3: Il Mondo degli Animali | PC | | Covermount | | SIAE1001PA | |
 | One Must Fall 2097
One Must Fall | PC | | Covermount |   | D.L.: M-8684-97 | ![2 and more dumps from original media [!]](/images/status/green.png "2 and more dumps from original media [!]") |
| Oni | PC | 1.0 | Covermount |  | | |
| Oni | PC | 1.0 | Covermount | | | |
 | Operacja Pustynny Grom / The Partners | PC | | Covermount | | | |
| Opowieści z Narnii: Książe Kaspian | PC | | Covermount |  | | |
| Original War (Disc 1) | PC | 1.02 | Covermount | | | |
| Original War (Disc 2) | PC | 1.02 | Covermount | | | |
| Oro e Gloria: La Strada per El Dorado | PC | | Covermount | | | |
 | Oro Negro: Juego de Guerra y Estrategia | PC | | Covermount |  | | |
| Outcast (Disc 1) | PC | | Covermount | | | |
| Outcast (Disc 2) | PC | | Covermount | | | |
| Outpost 2: Destini Sospesi | PC | 1.0 | Covermount | | | |
 | Overlord
BGamer 153 (Side A) | PC | | Covermount | | | |
 | Outward | PC | | Day One Edition | | 1024669LAINT, 103699 | |
 | Obbligato (Taikenban CD-ROM)
オブリガート 体験版CD-ROM | PC | | Demo |  | | |
 | Obsidian | PC | 1.0 | Demo | | | |
| On the Rain-Slick Precipice of Darkness: Episode One | PC | | Demo | | | |
| One Must Fall 2097 | PC | 1.1 | Demo | | | |
| Oni / 4x4 Evo
Oni / 4x4 Evolution | PC | | Demo | | 12DC1-09GM03-11 | |
 | Open Season
Boog & Elliot | PC | 1.0 | Demo |     | | |
| Outlaws (Demonstration Program) | PC | Demo 1.0 CD Build 3 | Demo | | 644230 | |
 | One Must Fall 2097 | PC | | Demo: JukeBox Collection | | | |
| O.D.T. | PC | | Dice | | DCG 005509 | |
 | Of Light and Darkness: The Prophecy (Disc 1) | PC | | Dice | | DMM 030689 | |
| Of Light and Darkness: The Prophecy (Disc 2) | PC | | Dice | | | |
| Of Light and Darkness: The Prophecy (Disc 3) | PC | | Dice | | | |
| Overboard! | PC | | Dice | | DCG 005752, DMM 005776 | |
| Overboard! | PC | | Dice | | DCG 005752, DMM 005776 | |
| Opowieści z Narnii: Lew, Czarownica i stara szafa
The The Chronicles of Narnia: The Lion Witch and The Wardrobe | PC | | Dookoła Filmu | | P_17791_03A_PL | |
| The Oregon Trail 3rd Edition: Pioneer Adventures | PC | 1.0 | DVD-ROM | | ORG811AE-DVD | |
| Outcast | PC | | DVD-ROM |   | | |
 | Oxide
Oxyde | PC | | Dynamite | | DE-006 | |
| The Oregon Trail 5th Edition: Adventures Along the Oregon Trail | PC | 1.01E | Enhanced Education Version | | 480599-CD | |
| Onsen Ping-Pong
温泉卓球 | PC | | Event Oyobi Tsuushin Hanbaiban | | | |
| Oil Tycoon 2
Oil Tycoon 2: Il Ritorno di una Leggenda | PC | | EXA Games | | EXAG020 | |
| OutRun 2006: Coast 2 Coast | PC | | eXtra Klasyka XK HIT | | TS OCC PL | |
| OIO: The Game: Enlarged | PC | | F*ckn' Best of Independent Games: Collection Vol. 1 | | | |
| Obrońca | PC | | FajnaGra.pl | | | |
| The Operative: No One Lives Forever (Disc 1) | PC | 1.004 | Game of the Year Edition | | S0025036 | |
| The Operative: No One Lives Forever (Disc 2) | PC | 1.004 | Game of the Year Edition | | S0025037 | |
| The Operative: No One Lives Forever (Disc 1) | PC | | Game of the Year Edition | | | |
| The Operative: No One Lives Forever (Disc 1) | PC | 1.004 | Game of the Year Edition | | | |
| 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 | 1.004 | Game of the Year Edition (BestSeller Series) | | S0026706 | |
| 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 | 1.004 | Game of the Year Edition (Xplosiv) | | EI-1685-1 | |
| The Operative: No One Lives Forever (Disc 2) | PC | 1.004 | Game of the Year Edition (Xplosiv) | | EI-1685-2 | |
 | 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 | |
| Overwatch | PC | | Game of the Year Edition, Legendary Edition | | 73052010US, S7302210 | |
| Oxyd Magnum! Gold Edition | PC | | Game-Pack 3 | | 80227 | |
| OutRun 2006: Coast 2 Coast | PC | | Gamer's Choice | | THQ70690 | |
 | Operation | PC | | General Mills | | | |
| Operation | PC | | General Mills | | AM801R5 | |
| Operation | PC | | General Mills | | AM0703R71 | |
| Orion Burger | PC | | Gold Games 2 (CD 11) | | SPI 046 | |
| Oscar | PC | | Golden Zone | | | |
| Oni | PC | 1.0 | Green Pepper | | | |
| OutRun 2006: Coast 2 Coast | PC | | GSP White Label: Reload | | 1673A | |
| OceanDive: Ocean Diving Adventure | PC | 1.2 | Hall of Game - 4Games Vol. 9 | | | |
| One Step Beyond | PC | | Hit Squad: Regenerator | | | |
| Open Kart | PC | | I Videogiochi del "Giornalino" | | | |
 | Order of War: Osvobozhdenie
Order of War: Освобождение | PC | | Igromaniya: Vybor redakcii | | | |
| Order of War: Stolknovenie
Order of War: Столкновение | PC | | Igromaniya: Vybor redakcii | | | |
| Owlboy | PC | 0.0.6152.604 | IndieBox | | | |
| Oscar | PC | | Jackson Libri | | | |
| Operation Flashpoint: Red River | PC | | Kakaku Kaiteihan | | FBG028W000A10 | |
| Obduction | PC | 1.4.2 | Kickstarter |  | | |
| Olympic Soccer | PC | | Kixx | | | |
 | Oscar the Balloonist and the Secrets of the Forest
Oscar de Ballonvaarder en de Geheimen van het Bos | PC | | Libelle | | | |
| Oddworld: Abe's Origins | PC | | Limited Run Games | | | |
| Outcast (Disc 1) | PC | | Limitierte Sonderausgabe | | OUTCAPC520/A1 | |
| Outcast (Disc 2) | PC | | Limitierte Sonderausgabe | | OUTCAPC520/A2 | |
| Outcast (Disc 3) | PC | | Limitierte Sonderausgabe | | OUTCAPC520/A3 | |
| Outlaws (Disco 1) | PC | 1.0 | LucasArts Classic | | 41175.101.IT | |
| Outlaws (Disco 2) | PC | 1.0 | LucasArts Classic | | 41175.102.IT | |
| Outlaws (Disc 1) | PC | 2.0 | LucasArts Classics | | 3000009.101.UK | |
| Outlaws (Disc 2) | PC | 2.0 | LucasArts Classics | | 3000009.102.UK | |
| Outlaws (Disc 1) | PC | | M6 Multimedia | | M6IMM6 | |
| Outlaws (Disc 2) | PC | | M6 Multimedia | | M6IMM6 | |
| Ostrich Runner | PC | | Microforum | | | |
| OMSI Add-on: Wien: Der Hochflurbus LU 200 | PC | 1.0 | OMSI Bundle | | | |
| OMSI: Der Omnibussimulator | PC | 1.04 | OMSI Bundle | | | |
| O.D.T. | PC | | Original | | | |
| O.D.T. | PC | | Original | | | |
| O.R.B: Off-World Resource Base | PC | 1.0 | Original | | 22434CD | |
| O'boy-jakten | PC | | Original | | | |
| Oak Mook 13: Ultrabook 3: Ura Game Dokuhon Furoku CD-ROM
ＯＡＫ ＭＯＯＫ１３ ウルトラブック３ 裏ゲーム読本 付録ＣＤ－ＲＯＭ | PC | | Original | | | |
| Ob"ekt 69: Kasablanka
Объект 69: Касабланка | PC | | Original | | RUSSOBIT-M 2003/408 | |
| Ob"ekt 69: Mest' Krassera
Объект 69: Месть Крассера | PC | | Original | | | |
 | ÖBB Railjet | PC | 1.0 | Original | | | |
| 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
Обитель Тьмы | PC | 5.02 04/07/03 | Original | | | |
| Obitel' t'my: Sumerki
Обитель тьмы: Сумерки | PC | 1.1 | Original | | | |
| Obratnyj otschet
Обратный отсчет | PC | v.1 1.06.10.22 | Original | | | |
