O

Obake no Q Tarou - Wanwan Panic (Japan)

Obocchama Kun (Japan)

Oeka Kids - Anpanman no Hiragana Daisuki (Japan)

Oeka Kids - Anpanman to Oekaki Shiyou!! (Japan)

Oishinbo (Japan)

Olympic I.Q. (Asia) (Unl) (NES)

Olympus no Tatakai (Japan)

Onyanko Town (Japan)

Operation Secret Storm (USA) (Unl)

Operation Wolf (USA) (Rev 0A)

Orb 3D (USA)

Osomatsu Kun (Japan)

Otaku no Seiza - An Adventure in the Otaku Galaxy (J) [T+Eng0.0001cg_Suicidal]

Otaku no Seiza - An Adventure in the Otaku Galaxy (Japan)

Othello (USA)

Outlanders (Japan)

Over Horizon (Europe)

Overlord (USA)