| Region | Title | System | Version | Edition | Languages | Serial | Status |
|---|
 | The Orange Box (Disc 1) | PC | | Original |                  | |  |
| The Orange Box (Disc 2) | PC | | Rerelease | | | |
| The Orange Box (Disc 2) | PC | | Original | | | |
 | The Orange Box (Disc 1)
戰慄時空2：二部曲重裝旗艦版 | PC | | Original | | TTE0193 | |
| The Orange Box (Disc 2)
戰慄時空2：二部曲重裝旗艦版 | PC | | Original | | TTE0193 | |
 | The Orange Box (Disc 2) | PC | | Original | | 985217 | ![2 and more dumps from original media [!]](/images/status/green.png "2 and more dumps from original media [!]") |
 | The Orange Box (Disc 1) | PC | | Original, EA Classics | | 985207, VAE07705811D, VAE07705811D/ENG, VAE07707118D/ENG, VAX07705811D/AUS | |
 | The Orange Box
오렌지 박스 | XBOX360 | | Original | | EA-2063 | |
| The Orange Box (Disc 2) | PC | | Original, EA Classics | | VAE07705811D2/ENG, VAE07707118D2/ENG, VAX07705811D2, VAX07705811D2/AUS | |
 | Orcs Must Die! | PC | | Original | | | |
| Order of War | PC | | Original | | OOW/LAB1 | |
| 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 | | Original | | RVL-ROXX-EUR | |
| Order Up! | WII | | Beta | | | |
| Order Up! | WII | | Original | | RVL-ROXE-USA | |
 | Order Up! | WII | | Original | | RVL-ROXP-UKV | |
 | Ore no Yome: Anata dake no Hanayome
俺の嫁 ～あなただけの花嫁～ | XBOX360 | | Original | | IF-2008 | |
| 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 | WII | | 40th Anniversary Edition | | RVL-SORE-USA-B0 | |
| Osada Avalona (Disc 1)
Осада Авалона | PC | | | | | |
| Osada Avalona (Disc 2)
Осада Авалона | PC | | | | | |
| Osaka Naniwa Matenrou
大阪ナニワ摩天楼 | PSX | | Original | | SLPS 02013 | |
| Osouji Sentai Clean Keeper
お掃除戦隊くりーんきーぱー | WII | | Original | | RVL-RC5J-JPN | |
| Ost-Indskaya kompaniya: Zolotoe izdanie
Ост-Индская компания: Золотое издание | PC | | Original | | | |
| Otogi
Ｏ・ＴＯ・ＧＩ ～御伽～ | XBOX | | Original | | FS-002 | |
 | Otogi
오토기 | XBOX | | Original | | YB-002 | |
| Otogi 2: Immortal Warriors | XBOX | | Original | | FS-004 | |
| Otogi 2: Immortal Warriors | XBOX | | Original | | FS-004 | |
| Otogi: Hyakki Toubatsu Emaki
Ｏ・ＴＯ・ＧＩ ～百鬼討伐絵巻～ | XBOX | | Special Pack | | FS-004 | |
| Otogi: Myth of Demons | XBOX | | Original | | FS-002 | |
| Otogi: Myth of Demons | XBOX | | Special Pack | | FS-002 | |
| Otogi: Myth of Demons | XBOX | | Original | | FS-002 | |
 | Otomedius Excellent | XBOX360 | | Original | | KN-2106 | |
| Otomedius Excellent!
オトメディウスＸ（エクセレント！） | XBOX360 | | Original | | KN-2074 | |
| Otomedius Gorgeous!
オトメディウス ゴージャス! | XBOX360 | | Original | | KN-2030 | |
| Ougon Musou Kyoku X
黄金夢想曲X | XBOX360 | | Original | | AJ-2003 | |
| Ougon no Kizuna
黄金の絆 | WII | | Original | | RVL-RK7J-JPN | |
| Oujisama Lv1
王子さまLv1 | PSX | | Original | | SLPS 03412 | |
| Oujisama Lv1.5: Oujisama no Tamago
王子さまＬｖ１．５ ～王子さまのたまご～ | PSX | | Original | | SLPS 03534 | |
| Oumagatoki
逢魔が時 | PSX | | Original, PSone Books | | SLPS 03235 … | |
| Oumagatoki 2
逢魔が時２ | PSX | | Original | | SLPS 03272 | |
| Our House: Party! | WII | | Original | | RVL-SHPE-USA-B0 | |
| Ousama Monogatari
王様物語 | WII | | Beta | | | |
| Ousama Monogatari
王様物語 | WII | | Original | | RVL-RO3J-JPN-B0 | |
| Outcast | PC | | DVD-ROM | | | |
| Outdoor Action Double Pack
Outdoor Action Double Pack: Remington Great American Bird Hunt and Shimano Xtreme Fishing | WII | | Original | | RVL-SFHE-USA-B0 | |
| Outer World
アウター・ワールド | 3DO | | Original | | FZ-SJ3451 | |
 | The Outfit | XBOX360 | | Original | | TQ-2002 | |
| The Outfit | XBOX360 | | Original | | TQ-2002 | |
| Outlaw Golf | XBOX | | Original | | TM-006 | |
| Outlaw Golf | XBOX | | Original | | TM-006 | |
| Outlaw Golf | GC | | Original | | DL-DOL-GOFP-EUR-01 | |
| Outlaw Golf
アウトローゴルフ | XBOX | | World Collection | | VU-016 | |
| Outlaw Golf | XBOX | | Original | | VU-016 | |
| Outlaw Golf | GC | | Original | | DL-DOL-GOFE-USA | |
| Outlaw Golf 2 | XBOX | | Original | | TT-023 | |
| Outlaw Golf 2 | XBOX | | Original | | TT-023 | |
| Outlaw Golf: 9 Holes of X-Mas | XBOX | | Original | | VU-027 | |
| Outlaw Golf: 9 More Holes of X-Mas | XBOX | | Original | | SS-006 | |
| Outlaw Golf: Holiday Golf | XBOX | | Original | | SS-005 | |
| Outlaw Tennis | XBOX | | Original | | TT-118 | |
| Outlaw Tennis | XBOX | | Original | | TT-118 | |
| Outlaw Volleyball | XBOX | | Original | | SS-007 | |
| Outlaw Volleyball
アウトローバレーボール | XBOX | | World Collection | | SS-003 | |
| Outlaw Volleyball
아웃로 발리볼 | XBOX | | Original | | SS-003 | |
| Outlaw Volleyball | XBOX | | Original | | SS-003 | |
| Outlaw Volleyball: Red Hot | XBOX | | Original | | SS-003 | |
| OutRun 2 | XBOX | | Demo | | SE-057 | |
| OutRun 2 | XBOX | | Original | | SE-054 | |
| OutRun 2 | XBOX | | Beta | | | |
| OutRun 2
アウトラン２ | XBOX | | Shokai Genteiban | | SE-054 | |
| OutRun 2 | XBOX | | Original | | SE-054 | |
| OutRun 2006: Coast 2 Coast | PC | | Gamer's Choice | | THQ70690 | |
| OutRun 2006: Coast 2 Coast | PC | | GSP White Label: Reload | | 1673A | |
| OutRun 2006: Coast 2 Coast | PC | | White Label | | 1673A | |
 | OutRun 2006: Coast 2 Coast | PC | | eXtra Klasyka XK HIT | | TS OCC PL | |
 | OutRun 2006: Coast 2 Coast | PC | | Top Games | | SEGA-PC029 | |
| OutRun 2006: Coast 2 Coast | XBOX | | Original | | SE-136 | |
| Outward | PC | | Day One Edition | | 1024669LAINT, 103699 | |
| Over Drivin' II
オーバードライビンⅡ | PSX | | Original | | SLPS 00895 | |
| Over Drivin' III: Hot Pursuit
オーバードライビンⅢ | PSX | | Original | | SLPS 01593 | |
| Over G Fighters | XBOX360 | | Original | | TI-2001 | |
| Over G: Energy Airforce | XBOX360 | | Original, Genteiban | | TI-2001 | |
| OverBlood
オーバーブラッド | PSX | | Major Wave | | SLPM 86641 | |
 | Overlord | PC | | Original | | MOVL1CDEU00 | |
| Overlord
オーバーロード：魔王サマ復活の時 | XBOX360 | | Original | | CM-2050 | |
| Overlord
BGamer 153 (Side A) | PC | | Covermount | | | |
| Overlord | XBOX360 | | Original | | CM-2005 | |
| Overlord | XBOX360 | | Beta | | | |
| Overlord | XBOX360 | | Beta | | | |
| Overlord II | PC | | Original | | MOVL2CDEU00 | |
| Overlord II | PC | | Classics | | MOVL2CDMP00 | |
| Overlord II | PC | | Original | | MOVL2CDPL00 | |
| Overlord II | PC | | Original | | | |
| Overlord II | PC | | Preview Code |   | | |
| Overlord II | XBOX360 | | Original | | CM-2057 | |
| Overlord II | XBOX360 | | Beta | | | |
| Overlord: Dark Legend | WII | | Original | | RVL-ROAP-EUR | |
