| Region | Title | System | Version | Edition | Languages | Serial | Status |
 | O-to-i-re: Dreamcast Sequencer お・と・い・れ ドリームキャストシーケンサー | DC | 1.002 | Original | | T-32801M |  |
 | O! Rety! Psoty Dudusia Wesołka | PC | | Playada Gier | | P_20265_03A_PL |  |
 | O.D.T. | PSX | | Original | | SLES-01391 | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | O.D.T. | PC | | Dice | | DCG 005509 |  |
 | O.D.T. | PC | | Original | | |  |
 | O.D.T. | PSX | | Original | | SLES-01409 | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | O.D.T. | PSX | | Demo | | SLED-01574 |  |
 | O.D.T. | PSX | | Demo | | SLED-01575 |  |
 | O.D.T. | PC | | Original | | | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | O.D.T. | PSX | | Original | | SLES-01410 |  |
 | O.D.T. | PSX | | Original | | SLES-01411 | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | O.D.T. | PSX | | Original | | SLES-01412 |  |
 | O.D.T. | PSX | | Original | | SLUS-00698 | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | O.D.T. | PSX | | Demo | | SLUS-90043 | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | O.G.A Onigokko Royal: Hunter wa Field de Koi o Suru O*G*A 鬼ごっこロワイアル ハンターは孤島(フィールド)で恋をする | PSP | 1.01 | Genteiban | | ULJM 06298 |  |
 | O.R.B: Off-World Resource Base | PC | | Covermount | | |  |
 | O.R.B: Off-World Resource Base | PC | 1.0 | Original | | 22434CD |  |
 | 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 | | |  |
 | Oasis Road オアシスロード | PSX | | Original | | SLPS 01899 |  |
 | Obbligato (Taikenban CD-ROM) オブリガート 体験版CD-ROM | PC | | Demo | | |  |
 | Obduction | MAC | | Kickstarter | | |  |
 | Obduction | PC | 1.4.2 | Kickstarter | | |  |
 | Obitaemyj ostrov: Chuzhoj sredi chuzhix Обитаемый остров: Чужой среди чужих | PC | | Original | | |  |
 | Objectif Transparence | CDI | | Original | | RP IND 4 94 |  |
 | Objectif Transparence | CDI | | Original | | RP IND 4 94 |  |
 | Oblachno, vozmozhny osadki v vide frikadelek Облачно, возможны осадки в виде фрикаделек | PSP | 1.00 | Original | | ULES-01361 |  |
 | Oblivious Garden: Carmina Burana (Disc 1) (Game Disk) | PC | 1.0 | Standard Edition | | |  |
 | Oblivious Garden: Carmina Burana (Disc 2) (Music Disc) | PC | | Standard Edition | | |  |
 | Obscure (Disc 1) ObsCure | PC | 1.0 | Original | | PCO457CD |  |
 | Obscure (Disc 2) ObsCure | PC | 1.0 | Original | | PCO457CD |  |
 | Obscure (Disc 3) ObsCure | PC | 1.0 | Original | | PCO457CD |  |
 | Obscure (Disc 4) ObsCure | PC | 1.0 | Original | | PCO457CD |  |
 | Obscure (Disc 5) ObsCure | PC | 1.0 | Original | | PCO457CD |  |
 | Obsidian (Disc 1) | PC | | Original | | | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Obsidian (Disc 2) | PC | | Original | | | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Obsidian (Disc 3) | PC | | Original | | | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Obsidian (Disc 4) | PC | | Original | | | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Obsidian (Disc 5) | PC | | Original | | | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Obsidian (Disc 1) | MAC | | Original, Great Series | | INR-001, MKM-001 | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Obsidian (Disc 1) オブシディアン | PC | | Original | | INR-1003 |  |
 | Obsidian (Disc 1) オブシディアン | PC | 1.0 | Original | | INR-1003 |  |
 | Obsidian (Disc 2) | MAC | | Original, Great Series | | INR-001, MKM-001 | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Obsidian (Disc 2) オブシディアン | PC | | Original | | INR-1002 |  |
 | Obsidian (Disc 2) オブシディアン | PC | 1.0 | Original | | INR-1003 |  |
 | Obsidian (Disc 3) | MAC | | Original, Great Series | | INR-001, MKM-001 | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Obsidian (Disc 3) オブシディアン | PC | | Original | | INR-1002 |  |
 | Obsidian (Disc 3) オブシディアン | PC | 1.0 | Original | | INR-1003 |  |
 | Obsidian (Disc 4) | MAC | | Original, Great Series | | INR-001, MKM-001 | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Obsidian (Disc 4) オブシディアン | PC | | Original | | INR-1002 |  |
 | Obsidian (Disc 4) オブシディアン | PC | 1.0 | Original | | INR-1003 |  |
 | Obsidian (Disc 5) | MAC | | Original, Great Series | | INR-001, MKM-001 | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Obsidian (Disc 5) オブシディアン | PC | | Original | | INR-1002 |  |
 | Obsidian (Disc 5) オブシディアン | PC | 1.0 | Original | | INR-1003 |  |
 | Obsidian | PC | 1.0 | Demo | | |  |
 | Obsidian (Disc 1) | PC | | Original | | 11008 |  |
 | Obsidian (Disc 1) | PC | | Original, Complimentary Copy | | 11008 | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Obsidian (Disc 2) | PC | | Original, Complimentary Copy | | 11008 | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Obsidian (Disc 3) | PC | | Original, Complimentary Copy | | 11008 | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Obsidian (Disc 4) | PC | | Original, Complimentary Copy | | 11008 | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Obsidian (Disc 5) | PC | | Original | | 11008 |  |
 | Obsidian (Disc 5) | PC | | Original, Complimentary Copy | | 11008 | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Obsidian: Alla Frontiera della Logica (Disc 1) | PC | 1.0.001 | Original | | |  |
 | Obsidian: Alla Frontiera della Logica (Disc 2) | PC | 1.0.001 | Original | | |  |
 | Obsidian: Alla Frontiera della Logica (Disc 3) | PC | 1.0.001 | Original | | |  |
 | Obsidian: Alla Frontiera della Logica (Disc 4) | PC | 1.0.001 | Original | | |  |
 | Obsidian: Alla Frontiera della Logica (Disc 5) | PC | 1.0.001 | Original | | |  |
 | Ocean Commander | PS2 | 1.01 | Original | | SLES-55047 |  |
 | Ocean Commander | WII | | Original | | RVL-RQME-USA |  |
 | Ocean Depths | AJCD | | Unlicensed (CD-R) | | |  |
 | Ocean/Infogrames Show Case December 1997 | PC | | | | |  |
 | OceanDive: Ocean Diving Adventure | PC | 1.2 | Hall of Game - 4Games Vol. 9 | | |  |
 | Oceans Below The Software Toolworks Presents ... Oceans Below | MAC | | Original | | 2198620-590001 / I 073100, CDRM1103420 | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Ochazukenori: Kaiki!! Mushi Danshaku no Yakata 御茶漬海苔 怪奇!!蟲男爵の館 | PC | | Original | | |  |
 | Ochigee Designer Tsukutte Pon! 落ちゲー・デザイナー 作ってポン! | SS | 1.090 | Original | | T-9108G | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Oda Nobunaga Den 織田信長伝 | PSX | | Original, Koei the Best | | SLPM 86337 … | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Oda Nobunaga Den 織田信長伝 | PC | 1.0 | Original | | KN11-93101 |  |
 | Odama | GC | | Original | | DL-DOL-GOOP-EUR | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Odama 大玉 | GC | Rev 1 | Bundled with Microphone | | DL-DOL-GOOJ-JPN | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Odama | GC | Rev 1 | Original | | DL-DOL-GOOE-USA | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Oddballz: Your Wacky Computer Petz | PC | 1.0 | Original | | CS090370 | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Oddworld: Abe's Exoddus (Instalar) | PC | 2.0 | Original | | |  |
 | Oddworld: Abe's Exoddus (Jugar) | PC | 2.0 | Original | | |  |
 | Oddworld: Abe's Exoddus (Play Disc) | PC | 2.0 | Budget, Covermount | | MMICDR 5280 | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Oddworld: Abe's Exoddus (Install Disc) | PC | 2.0 | Original | | | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Oddworld: Abe's Exoddus (Play Disc) | PC | 2.0 | Original | | | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Oddworld: Abe's Exoddus (Disc 1) | PSX | | Original, Platinum | | SLES-01480 … | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Oddworld: Abe's Exoddus (Disc 2) | PSX | | Original, Platinum | | SLES-11480 … | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Oddworld: Abe's Exoddus (CD Installieren) | PC | 2.0 | Original | | |  |
 | Oddworld: Abe's Exoddus (CD Abspielen) | PC | 2.0 | Original | | |  |
 | Oddworld: Abe's Exoddus (Disc 1) | PSX | | Original | | SLES-01503 | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Oddworld: Abe's Exoddus (Disc 2) | PSX | | Original | | SLES-11503 | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Oddworld: Abe's Exoddus (Disc 1) | PC | 1.0 | Covermount | | |  |
 | Oddworld: Abe's Exoddus (Disc 2) | PC | 1.0 | Covermount | | |  |
 | Oddworld: Abe's Exoddus (Installazione) | PC | 1.0 | Replay | | ABEXPCREI/A1 | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Oddworld: Abe's Exoddus (Gioco) | PC | 1.0 | Replay | | ABEXPCREI/A2 | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Oddworld: Abe's Exoddus (Disc 1) | PSX | | Original, Platinum | | SLES-01504 … | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Oddworld: Abe's Exoddus (Disc 2) | PSX | | Original, Platinum | | SLES-11504 … | ![2 and more dumps from original media [!] 2 and more dumps from original media [!]](/images/status/green.png) |
 | Oddworld: Abe's Exoddus (Installatie Disk) | PC | 2.0 | Budget | | MMICDR 5280 |  |
 | Oddworld: Abe's Exoddus (Disc 1) | PSX | | Original | | SLES-01505 |  |
 | Oddworld: Abe's Exoddus (Disc 2) | PSX | | Original | | SLES-11505 |  |