| Ochainu no Bouken Jima
| 4536478000762 | AGB-BO2J-JPN | 2005-12-22
|
| Oceans Below
| | | 1993-0-0
|
| Obunsha Deru-jun Kokugo DS
| 4582107391435 | NTR-P-AJHJ | 2007-5-31
|
| Obunsha Deru-jun Chiri DS
| 4582107391428 | NTR-P-AIWJ | 2007-5-31
|
| Obscure: The Aftermath
| 893384000397 | | 2008-3-25
|
| Obscure: The Aftermath
| 893384000403 | SLUS-21709 | 2008-3-25
|
| Obscure
| 625904457622 | SLUS-20777 | 2005-4-4
|
| Obscure
| 625904457653 | | 2005-4-4
|
| Obitus
| 715504030506 | | 1994-5-0
|
| Oasis Road
| 4995857130290 | SLPS-01899 | 1999-2-25
|
| O.M.G. 26 - Our Mini Games
| 695771802009 | | 2007-10-30
|
| O.D.T.
| 735009402127 | | 1998-11-30
|
| O-to-i-re: Dreamcast Sequencer
| 4516259000204 | T-32801M | 1999-12-9
|
| O-Chan no Oekaki Logic: Puzzler Kanshuu (SunKore Best)
| 4907940212004 | SLPS-01568 | 1998-10-1
|
| O-Chan no Oekaki Logic: Puzzler Kanshuu
| 4907940211281 | SLPS-00093 | 1995-9-8
|
| O-Chan no Oekaki Logic 3 (Value 1500)
| 4907940212769 | SLPS-03134 | 2001-2-15
|
| O-Chan no Oekaki Logic 2: Color mo Arimasuwa (SunKore Best)
| 4907940212202 | SLPS-02145 | 1999-7-1
|
| O-Chan no Oekaki Logic 2: Color mo Arimasuwa
| 4907940211472 | SLPS-00345 | 1996-9-27
|
| O-Chan no Oekaki Logic 2 (Value 1500)
| 4907940212752 | SLPS-03117 | 2001-1-11
|
| O-Chan no Oekaki Logic (Value 1500)
| 4907940212745 | SLPS-03116 | 2001-1-11
|
| O Hobo Goto
| 4933032003519 | | 2005-7-29
|