| Oni II - Oni Densetsu | 1992 | gb |
| Oni III - Kuro no Hakaishin | 1993 | gb |
| Oni IV - Kijin no Ketsuzoku | 1994 | gb |
| Oni V - Oni wo Tsugumono | 1995 | gb |
| Oni Zero - Sengoku Ranse Hyakka Ryouran | 2007 | nds |
| Onigiri | 2017 | vita |
| Onigiri | 2014 | xboxone |
| Oninaki | 2019 | ps4, switch |
| Onmyou Taisenki - Zeroshiki | 2004 | gba |
| Ooedo Blacksmith | 2014 | vita |
| Operation Abyss - New Tokyo Legacy | 2015 | vita |
| Operation Babel - New Tokyo Legacy | 2017 | vita |
| Operation Darkness | 2007 | xbox360 |
| Operencia: The Stolen Sun | 2019 | ps4, xboxone |
| Opoona | 2007 | wii |
| Orangeblood | 2020 | ps4, switch, xboxone |
| Orcs & Elves | 2007 | nds |
| Ore no Dungeon - Desire and Adventurous Spirit | 2006 | psp |
| Ore no Shikabane o Koete Yuke 2 | 2015 | vita |
| Oreshika - Tainted Bloodlines | 2014 | vita |
| Oriental Blue - Ao no Tengai | 2003 | gba |
| Otaku no Seiza - An Adventure in the Otaku Galaxy | 1991 | nes |
| Other Life - Azure Dreams GB | 1999 | gbc |
| Othercide | 2020 | ps4, switch |
| Otogibanashi Taisen | 1995 | gb |
| Ou Dorobou Jing - Angel Version | 1999 | gbc |
| Ou Dorobou Jing - Devil Version | 1999 | gbc |
| Ougon no Kizuna | 2009 | wii |
| Ougon no Taiyou - Ushinawareshi Toki | 2002 | gba |
| Oujisama Lv1 | 2002 | ps1 |
| Oujisama Lv1.5 - Oujisama no Tamago | 2003 | ps1 |
| Oukoku no Grand Chef | 1996 | 3do |
| Out Live | 1989 | pcengine |
| The Outer Worlds | 2019 | ps4, switch, xboxone |
| The Outfit | 2006 | xbox360 |
| Outlanders | 1987 | nes |
| Outward: The Adventurer Life Sim | 2019 | ps4 |
| Overlord: Fellowship of Evil | 2015 | ps4, xboxone |
| P3 - Persona 3 | 2008 | ps2 |
| PC Engine Best Collection - Tengai Makyou Collection | 2008 | psp |
| PD Ultraman Battle Collection 64 | 1999 | n64 |
| Pachi Pachi Saga | 1996 | ps1 |
| Pal - Shinken Densetsu | 1997 | ps1 |
| Paladin's Quest | 1993 | snes |
| Palia | 2023 | switch |
| Pandora Max Series Vol. 1 - Dragon Knights Glorious | 1999 | ps1 |
| Pandora Max Series Vol. 3 - Rubbish Blazon | 2000 | ps1 |
| Pandora Max Series Vol. 6 - Oni Zero - Fukkatsu | 2001 | ps1 |
| Pandora's Tower | 2011 | wii |
| Paneltia Story - Koeln no Daibouken | 1997 | saturn |
| Panzer Dragoon | 1995 | saturn |
| Panzer Dragoon Saga | 1998 | saturn |
| Paper Mario | 2000 | n64, wiiu |
| Paper Mario - Super Seal | 2012 | 3ds |
| Paper Mario - The Thousand-Year Door | 2004 | gc |
| Paper Mario: The Thousand-Year Door | 2024 | switch |
| Paradise Killer | 2020 | switch |
| Pascal's Wager | 2022 | switch |
| Path of Exile | 2017 | xboxone |
| Pathfinder: Kingmaker | 2020 | ps4 |
| Pathfinder: Wrath of the Righteous | 2022 | ps4 |
| Penny Arcade Adventures - On the Rain-Slick Precipice of Darkness - Episode One | 2008 | xbox360 |
| Penny Arcade Adventures - On the Rain-Slick Precipice of Darkness - Episode Two | 2008 | xbox360 |
| Penny-Punching Princess | 2018 | switch, vita |
| Percy Jackson & the Lightning Thief | 2010 | nds |
| Persona | 1996 | ps1, psp |
| Persona 2 - Batsu | 2012 | psp |
| Persona 2 - Batsu - Eternal Punishment | 2000 | ps1 |
| Persona 2 - Eternal Punishment | 2000 | ps1 |
| Persona 2 - Tsumi | 2011 | psp |
| Persona 2 - Tsumi - Innocent Sin | 1999 | ps1 |
| Persona 3 | 2006 | ps2 |
| Persona 3 Portable | 2010 | ps4, psp, switch, xboxone |
| Persona 3 Reload | 2024 | ps4 |
| Persona 4 | 2008 | ps2 |
| Persona 4 - The Ultimate in Mayonaka Arena | | ps3 |
| Persona 4 Golden | 2012 | ps4, switch, vita, xboxone |
| Persona 5 | 2016 | ps3, ps4 |
| Persona 5 Royal | 2019 | ps4, switch, xboxone |
| Persona 5 Tactica | 2023 | ps4, switch |
| Persona Q - Shadow of the Labyrinth | 2014 | 3ds |
| Phantasy Star | 2009 | wii |
| Phantasy Star - Sennenki no Owari | | wii |
| Phantasy Star - Sennenki no Owari ni | 1994 | genesis |
| Phantasy Star 0 | 2008 | nds |
| Phantasy Star Adventure | 1992 | gg |
| Phantasy Star Fukkokuban | 1994 | genesis |
| Phantasy Star Gaiden | 1992 | gg |
| Phantasy Star II | 1989 | genesis |
| Phantasy Star II | 2008 | wii |
| Phantasy Star II - Kaerazaru Toki no Owari ni | 1989 | genesis |
| Phantasy Star II - Kaerazaru Toki no Owari ni | | wii |
| Phantasy Star II - Rudger's Adventure | 1989 | genesis |
| Phantasy Star III - Generations of Doom | 1990 | genesis |
| Phantasy Star III - Generations of Doom | 2008 | wii |
| Phantasy Star IV | 1994 | genesis |
| Phantasy Star IV | 2008 | wii |
| Phantasy Star Nova | 2014 | vita |
| Phantasy Star Online | 2000 | dreamcast |
| Phantasy Star Online 2 | 2013 | switch, vita |