| Ishii Hisaichi no Daiseikai | 1994 | segacd |
| Island Flight Simulator | 2015 | wiiu |
| Islanders | 2021 | switch |
| It's Only Rock 'N' Roll | 1984 | col |
| Itsuka, Kasanariau Ashita e - Sayuri-hen | 1999 | ps1 |
| Itsuka, Kasanariau Ashita e - Shirou-hen | 1999 | ps1 |
| J.League Pro Soccer Club o Tsukurou! | 1999 | dreamcast |
| J.League Pro Soccer Club o Tsukurou! | 1996 | saturn |
| J.League Pro Soccer Club o Tsukurou! 2 | 1997 | saturn |
| J.League Pro Soccer Club o Tsukurou! 5 | 2007 | ps2 |
| J.League Tactics Manager - Realtime Soccer Simulation | 2003 | ps2 |
| J.League Tactics Soccer | 1999 | n64 |
| JASF - Jane's Advanced Strike Fighters | 2011 | ps3 |
| JASF - Jane's Advanced Strike Fighters | 2011 | xbox360 |
| Jackpot 777 | 2016 | wiiu |
| James 'Buster' Douglas Knockout Boxing | 1990 | genesis |
| Jane's Hotel | 2004 | nds |
| Japan's #1 Baseball Manager | 1990 | nes |
| Japanese Rail Sim 3D - Journey in Suburbs #1 | 2015 | 3ds |
| Japanese Rail Sim: Journey to Kyoto | 2019 | ps4, switch |
| Jellyfish - The Healing Friend | 2000 | ps1 |
| Jet Coaster Dream | 1999 | dreamcast |
| Jet Impulse | 2007 | nds |
| Jet de Go! - Let's Go by Airliner | 2000 | gbc |
| Jet de Go! 2 | 2002 | ps2 |
| Jet de Go! Pocket | 2005 | psp |
| Jet de Go! Pocket - Let's Go By Airliner | 2005 | psp |
| Jewelpet - Kawaii Mahou no Fantasy | 2009 | nds |
| Jewelpet - Mahou no DS Kirapikarin | 2009 | nds |
| Jewelpet - Mahou no Oheya de Issho ni Asobou! | 2010 | nds |
| Jikkyou GI Stable | 2000 | ps2 |
| Jikkyou GI Stable 2 | 2002 | ps2 |
| Jikkyou Kyousouba Ikusei Simulation Game - Breeding Stud '99 | 1999 | ps1 |
| Jintori Action! Taikoukenchi - Karakuri Shiro no Nazo | 2009 | wii |
| Jitsumei Jikkyou Keiba - Dream Classic - 2001 Autumn | 2001 | ps2 |
| Jitsumei Jikkyou Keiba - Dream Classic 2001 Spring | 2001 | ps2 |
| Jitsumei Jikkyou Keiba - Dream Classic 2002 | 2002 | ps2 |
| Jojo's Fashion Show | 2009 | nds |
| Jouki Kikansha Unten Simulation - SL de Ikou! | 1998 | ps1 |
| Jouki Kikansha Unten Simulation - SL de Ikou! II | 1999 | ps1 |
| Jounetsu Nekketsu Athletes - Nakimushi Coach no Diary | 1997 | ps1 |
| Jurassic Park III - Park Builder | 2001 | gba |
| Jurassic World Evolution | 2018 | ps4, switch, xboxone |
| Kaeru no Ehon - Nakushita Kioku o Motomete | 1999 | ps1 |
| Kaishin!! Derby Analyst | 2000 | ps1 |
| Kaitou Ranma Miyabi | 1999 | ps1 |
| Kami Jigen Idol Neptune PP | 2013 | vita |
| Kandume Monsters | 1998 | gb |
| Kanuchi - Kuroki Tsubasa no Shou | 2009 | ps2 |
| Kanuchi - Shiroki Tsubasa no Shou | 2008 | ps2 |
| Kappa no Kaikata - How to Breed Kappas | 2004 | ps2 |
| Katekyoo Hitman Reborn! DS - Ore ga Boss! - Saikyou Family Taisen | 2009 | nds |
| Kawa no Nushi Tsuri - Wonderful Journey | 2005 | ps2 |
| Kawaii Koinu DS 2 | 2008 | nds |
| Kawaii Koinu DS 3 | 2010 | nds |
| Kawaii Koneko DS | 2008 | nds |
| Kawaii Koneko DS 2 | 2009 | nds |
| Kawaii Koneko DS 3 | 2010 | nds |
| Kawaii Pet Game Gallery | 2003 | gba |
| Keiba Eight '98 Aki Fuyu | 1998 | ps1 |
| Keiba Eight '98 Haru Natsu | 1998 | ps1 |
| Keiba Eight '99 Haru Natsu | 1999 | ps1 |
| Keiba Saishou no Housoku '95 | 1995 | ps1 |
| Keiba Saishou no Housoku '96 Vol. 1 | 1996 | ps1 |
| Keiba Saishou no Housoku '96 Vol. 2 - GI-Road | 1996 | ps1 |
| Keiba Saishou no Housoku '97 Vol. 1 - Nerae! Manbaken! | 1997 | ps1 |
| Keiba Saishou no Housoku '97 Vol. II - To Hit | 1997 | ps1 |
| Keiba Saishou no Housoku '99 Shuutou | 1999 | ps1 |
| The Keihin Kyuukou - Train Simulator Real | 2003 | ps2 |
| Kekkon - Marriage | 1995 | ps1, saturn |
| Kenki Ippatsu! Crane Master ni Narou! | 2000 | ps1 |
| Kerbal Space Program 2 | | ps4 |
| Kid Adventures - Sky Captain | 2010 | wii |
| Kidou Senkan Nadesico - Nadesico the Mission | 1999 | dreamcast |
| Kidou Senshi Gundam - Gundam vs. Gundam | 2008 | psp |
| Kidou Senshi Gundam - Gundam vs. Gundam Next Plus | 2009 | psp |
| Kidou Senshi Gundam Seed - Rengou vs. Z.A.F.T. Portable | 2007 | psp |
| Kids Learn & Play - Pets & Vets Bundle | 2012 | nds |
| Kill It With Fire | 2021 | ps4, switch, xboxone |
| Kimero!! Hero Gakuen - Eiyuu ni Kotae Nashi | 2003 | ps1 |
| Kimi ni Steady | 2000 | ps1 |
| Kimi no Kimochi, Boku no Kokoro - I've Possessed Your Body! | 2000 | ps1 |
| Kin'iro no Corda | 2004 | ps2, psp |
| Kin'iro no Corda 2 | 2007 | ps2 |
| Kin'iro no Corda 2 Encore | 2007 | ps2 |
| Kin'iro no Corda 3 | 2010 | ps2 |
| Kindan no Pet - Seaman - Gasse Hakase no Jikken-tou | 2001 | ps2 |
| Kinder im Verkehr 1 | 1982 | o2 |
| Kinectimals - Now with Bears! | 2011 | xbox360 |
| King of Parlor | 1996 | ps1 |
| King of Producer | 1997 | ps1 |
| King of Stallion | 1996 | ps1 |
| Kingdom Euphoria | 2024 | genesis |
| A Kingdom for Keflings | 2009 | xbox360 |
| Kirameki Oshare Salon! Watashi no Shigoto wa Biyoushi-San | 2017 | 3ds |
| Kisekae Series 2 - Oshare Nikki | 2001 | gbc |
| Kisha de Go! | 2000 | ps1 |
| Kiss yori | 1999 | saturn |
| Kitty Powers' Matchmaker | 2017 | ps4, xboxone |
| Kiwami Birei Aquarium - Sekai no Sakana to Iruka Kujira-tachi | 2008 | nds |