| Off-World Interceptor
| 765979610503 | | 1994-0-0
|
| Off-Road Challenge
| 031719198023 | | 1998-6-30
|
| Off the Wall
| | | 1989-0-0
|
| Oekaki Puzzle Shuu (SuperLite 3in1 Series)
| 4944076002109 | SLPM-86955 | 2002-1-24
|
| Oekaki Puzzle Battle Vol. 1: Yuusha-Oh GaoGaiGar Version
| 4526519000424 | NTR-P-AMRJ | 2005-12-8
|
| Oekaki Puzzle 5 (SuperLite 1500 Series)
| 4944076001812 | SLPM-86800 | 2001-4-26
|
| Oekaki Puzzle 4 (SuperLite 1500 Series)
| 4944076001607 | SLPM-86675 | 2000-11-30
|
| Oekaki Puzzle 3 (SuperLite 1500 Series)
| 4944076001348 | SLPM-86533 | 2000-6-29
|
| Oekaki Puzzle 2 (SuperLite 1500 Series)
| 4944076000990 | SLPM-86428 | 2000-1-27
|
| Oekaki Puzzle (SuperLite 1500 Series)
| 4944076000570 | SLPS-02068 | 1999-5-27
|
| Odoru Made in Wario
| 4902370515619 | RVL-P-RODJ | 2006-12-2
|
| Odo Odo Oddity
| 4514850196036 | SLPS-00754 | 1997-3-14
|
| Odin Sphere
| 730865530236 | SLUS-21577 | 2007-5-22
|
| Odin Sphere
| 4984995900162 | SLPM-66474 | 2007-5-7
|
| Oddworld: Stranger's Wrath
| 014633148862 | | 2005-1-25
|
| Oddworld: Munch's Oddysee
| 785138321417 | | 2003-9-26
|
| Oddworld: Munch's Oddysee
| 659556745240 | | 2001-11-6
|
| Oddworld: Abe's Oddysee
| | | 1997-10-31
|
| Oddworld: Abe's Oddysee
| 742725500235 | | 1997-10-27
|
| Oddworld: Abe's Exoddus
| 742725160156 | | 1998-11-25
|
| Oddworld Adventures 2
| 742725193574 | | 2000-1-24
|
| Oddworld Adventures
| 742725169319 | DMG-AODE-USA | 1998-12-0
|
| Odama
| 045496963422 | | 2006-4-11
|
| Odama
| 4902370513509 | DOL-2-GOOJ | 2006-4-13
|
| Oda Nobunaga Den (Koei the Best)
| 4988615014161 | SLPM-86337 | 1999-10-1
|
| Oda Nobunaga Den (Koei Teiban Series)
| 4988615016851 | SLPM-87042 | 2002-2-7
|
| Oda Nobunaga Den
| 4988615012426 | SLPS-01595 | 1998-9-23
|
| Octomania
| 730865700035 | | 2008-3-27
|
| Ochanoma Battle
| 4961818000193 | SLPM-86681 | 2000-12-14
|
| Ochaken no Heya DS 2
| 4536478000816 | NTR-P-AOHJ | 2007-1-18
|
| Ochaken no Heya DS
| 4536478000793 | NTR-P-AOCJ | 2006-4-27
|
| Ochaken no Heya
| 4536478000564 | AGB-BDRJ-JPN | 2003-12-19
|
| Ochaken Kururin: Honwaka Puzzle de Hotto Shiyo
| 4536478000618 | AGB-BIKJ-JPN | 2004-10-28
|
| Ochainu no Yume Bouken
| 4536478000687 | AGB-BCUJ-JPN | 2005-4-28
|
| Ochainu no Daibouken
| 4536478000878 | NTR-P-YOHJ | 2007-12-20
|
| 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
|