| Title | Japanese Title | Developer | Publisher | Series | Genre | Platforms | Year |
|---|
| 100man-nin no Kiniro no Corda | 100万人の金色のコルダ | Ruby Party | GREE/Koei | Kin'iro no Corda | Dating sim | Microsoft Windows, mobile phones | 2011 |
| 100man-nin no Sangokushi | 株式会社ディー・エヌ・エー | GREE/DeNA | Koei | Romance of the Three Kingdoms | Role-playing | Microsoft Windows, mobile phones | 2010 |
| Aerobiz | エアーマネジメント 大空に賭ける | Koei | Koei | Koei Executive | Business simulation | SNES, Sega Genesis | 1992 |
| Aerobiz Supersonic | エアーマネジメントII 航空王をめざせ | Koei | Koei | Koei Executive | Business simulation | SNES, Mega Drive | 1993 |
| Aibou DS | 相棒DS | Tecmo | Tecmo | None | Visual novel | Nintendo DS | 2009 |
| All Girl Wrestling: Ultimate Angels | | Tecmo | Tecmo | None | Sports-based Fighting | Super Famicom, mobile phones | 1989 |
| Angelique | アンジェリーク | Ruby Party | Koei | Angelique | Dating sim | Super Famicom, Game Boy Advance | 1994 |
| Angelique Duet | アンジェリーク デュエット | Ruby Party | Koei | Angelique | Dating sim | Sega Saturn, PlayStation, Nintendo DS | 1998 |
| Angelique étoile | アンジェリーク エトワール | Ruby Party | Koei | Angelique | Dating sim | Microsoft Windows, PlayStation 2 | 2003 |
| Angelique Special | アンジェリークSpecial | Ruby Party | Koei | Angelique | Dating sim | PC-FX, Microsoft Windows, Sega Saturn, PlayStation | 1995 |
| Angelique Special 2 | アンジェリークSpecial2 | Ruby Party | Koei | Angelique | Dating sim | PC-FX, Microsoft Windows, Sega Saturn, PlayStation, Classic Mac OS | 1996 |
| Angelique Tenkū no Requiem | アンジェリーク 天空の鎮魂歌 | Ruby Party | Koei | Angelique | Dating sim | PC-FX, PlayStation | 1998 |
| Angelique Trois | アンジェリーク トロワ | Ruby Party | Koei | Angelique | Dating sim | PlayStation 2 | 2000 |
| Aoki Ōkami to Shiroki Mejika | 蒼き狼と白き牝鹿 | Koei | Koei | Aoki Ōkami to Shiroki Mejika | Historical turn-based strategy | PC-88, PC-98, MSX | 1985 |
| Ar Nosurge | アルノサージュ ～生まれいずる星へ祈る詩 | Gust | Tecmo Koei | Surge Concerto | Role-playing | PlayStation 3, PlayStation Vita | 2014 |
| Arslan: The Warriors of Legend | アルスラーン戦記×無双 | Omega Force | Koei | The Heroic Legend of Arslan | Hack and slash | PlayStation 3, PlayStation 4, Xbox One, Microsoft Windows | 2015 |
| Atelier Annie: Alchemists of Sera Island | アニーのアトリエ ～セラ島の錬金術士～ | Gust | Koei | Atelier | Role-playing | Nintendo DS | 2009 |
| Atelier Ayesha: The Alchemist of Dusk | アーシャのアトリエ ～黄昏の大地の錬金術士～ | Gust | Koei Tecmo | Atelier | Role-playing | PlayStation 3, PlayStation Vita | 2012 |
| Atelier Elie: The Alchemist of Salburg 2 | エリーのアトリエ ～ザールブルグの錬金術士2～ | Gust | Koei Tecmo | Atelier | Role-playing | PlayStation, PlayStation 2, Sega Saturn, Microsoft Windows, Dreamcast, Game Boy Color, WonderSwan, mobile phones | 1998 |
| Atelier Elkrone: Dear for Otomate | エルクローネのアトリエ ~Dear for Otomate~ | Gust | Koei Tecmo | Atelier | Role-playing | PlayStation Portable | 2012 |
| Atelier Escha & Logy: Alchemists of the Dusk Sky | エスカ＆ロジーのアトリエ ～黄昏の空の錬金術士～ | Gust | Koei Tecmo | Atelier | Role-playing | PlayStation 3, PlayStation Vita | 2013 |
| Atelier Firis: The Alchemist and the Mysterious Journey | フィリスのアトリエ ～不思議な旅の錬金術士～ | Gust | Koei Tecmo | Atelier | Role-playing | PlayStation 4, PlayStation Vita, Microsoft Windows | 2016 |
| Atelier Iris: Eternal Mana | イリスのアトリエ エターナルマナ | Gust | Koei | Atelier | Role-playing | PlayStation 2, mobile phones | 2004 |
| Atelier Iris 2: The Azoth of Destiny | イリスのアトリエ エターナルマナ2 | Gust | Koei | Atelier | Role-playing | PlayStation 2, mobile phones | 2005 |
| Atelier Iris 3: Grand Phantasm | イリスのアトリエ グランファンタズム | Gust | Koei | Atelier | Role-playing | PlayStation 2, mobile phones | 2006 |
| Atelier Judie: The Alchemist of Gramnad | ユーディーのアトリエ ～グラムナートの錬金術士～ | Gust | Koei Tecmo | Atelier | Role-playing | PlayStation 2, PlayStation Portable | 2002 |
| Atelier Lydie & Soeur: Alchemists of the Mysterious Painting | リディー＆スールのアトリエ ～不思議な絵画の錬金術士～ | Gust | Koei Tecmo | Atelier | Role-playing | Microsoft Windows, PlayStation 4, PlayStation Vita, PlayStation TV, Nintendo Switch | 2017 |
| Atelier Lilie: The Alchemist of Salburg 3 | リリーのアトリエ ～ザールブルグの錬金術士3～ | Gust | Koei Tecmo | Atelier | Role-playing | PlayStation 2, Sega Saturn, Microsoft Windows, Dreamcast, mobile phones | 2001 |
| Atelier Lina: The Alchemist of Strahl | リーナのアトリエ 〜シュトラールの錬金術士〜 | Gust | Koei Tecmo | Atelier | Role-playing | Nintendo DS | 2009 |
| Atelier Lise: The Alchemist of Orde | リーズのアトリエ 〜オルドールの錬金術士〜 | Gust | Koei Tecmo | Atelier | Role-playing | Nintendo DS | 2007 |
| Atelier Lulua: The Scion of Arland | (ルルアのアトリエ ～アーランドの錬金術士 4～ | Gust | Koei Tecmo | Atelier | Role-playing | PlayStation 4, Nintendo Switch, Microsoft Windows | 2019 |
| Atelier Marie, Elie & Anis: Message on the Gentle Breeze | マリー、エリー&アニスのアトリエ 〜そよ風からの伝言〜 | Gust | Koei | Atelier | Role-playing | Game Boy Advance | 2003 |
| Atelier Marie: The Alchemist of Salburg | マリーのアトリエ ～ザールブルグの錬金術士～ | Gust | Koei Tecmo | Atelier | Role-playing | PlayStation, PlayStation 2, PlayStation Network, Sega Saturn, Microsoft Windows, Dreamcast, Game Boy Color, WonderSwan, mobile phones | 1997 |
| Atelier Meruru: The Apprentice of Arland | メルルのアトリエ～アーランドの錬金術士3～ | Gust | Tecmo Koei | Atelier | Role-playing | PlayStation 3, PlayStation Vita, PlayStation 4, Nintendo Switch | 2011 |
| Atelier Online: Alchemists of the Brasier | アトリエ オンライン ～ブレセイルの錬金術士～ | Gust | Koei Tecmo | Atelier | Role-playing | Android, iOS | 2018 |
| Atelier Questboard | アトリエ クエストボード | Gust | Koei Tecmo | Atelier | Role-playing | Android, iOS | 2014 |
| Atelier Rorona: The Alchemist of Arland | ロロナのアトリエ ～アーランドの錬金術師～ | Gust | Koei Tecmo | Atelier | Role-playing | PlayStation 3, PlayStation Vita, Nintendo 3DS, PlayStation 4, Nintendo Switch | 2009 |
| Atelier Ryza: Ever Darkness & the Secret Hideout | ライザのアトリエ 常闇の女王と秘密の隠れ家 | Gust | Koei Tecmo | Atelier | Role-playing | Nintendo Switch, PlayStation 4, Microsoft Windows | 2019 |
| Atelier Ryza 2: Lost Legends & the Secret Fairy | ライザのアトリエ２ ～失われた伝承と秘密の妖精～ | Gust | Koei Tecmo | Atelier | Role-playing | Nintendo Switch, PlayStation 4, PlayStation 5, Microsoft Windows | 2020 |
| Atelier Sophie 2: The Alchemist of the Mysterious Dream | ソフィーのアトリエ2 ～不思議な夢の錬金術士～ | Gust | Koei Tecmo | Atelier | Role-playing | Nintendo Switch, PlayStation 4, Microsoft Windows | 2022 |
| Atelier Ryza 3: Alchemist of the End & the Secret Key | | Gust | Koei Tecmo | Atelier | Role-playing | Nintendo Switch, PlayStation 4, PlayStation 5, Microsoft Windows | 2023 |
| Atelier Shallie: Alchemists of the Dusk Sea | シャリーのアトリエ～黄昏の海の錬金術士～ | Gust | Koei Tecmo | Atelier | Role-playing | PlayStation 3, PlayStation Vita | 2014 |
| Atelier Sophie: The Alchemist of the Mysterious Book | シャリーのアトリエ～黄昏の海の錬金術士～ | Gust | Koei Tecmo | Atelier | Role-playing | PlayStation 3, PlayStation Vita | 2015 |
| Atelier Totori: The Adventurer of Arland | トトリのアトリエ ～アーランドの錬金術士 2～ | Gust | Tecmo Koei | Atelier | Role-playing | PlayStation 3, PlayStation Vita, PlayStation 4, Nintendo Switch | 2010 |
| Atelier Viorate: The Alchemist of Gramnad 2 | ヴィオラートのアトリエ ～グラムナートの錬金術士2～ | Gust | Koei Tecmo | Atelier | Role-playing | PlayStation 2, PlayStation Portable | 2003 |
| Attack on Titan | 進撃の巨人 | Omega Force | Koei Tecmo | Attack on Titan | Action, hack and slash | Microsoft Windows, PlayStation 4, PlayStation 3, PlayStation Vita, Xbox One | 2016 |
| Attack on Titan 2 | 進撃の巨人2 | Omega Force | Koei Temco | Attack on Titan | Action, hack and slash | Nintendo Switch, Microsoft Windows, PlayStation 4, PlayStation Vita, Xbox One | 2018 |
| Attack on Titan: Escape from Certain Death | 進撃の巨人 死地からの脱出 | Ruby Party | Koei Tecmo | Attack on Titan | Visual novel | Nintendo 3DS | 2017 |
| Bad News Baseball | 激闘スタジアム | Tecmo | Tecmo | None | Sports video game | NES | 1989 |
| Bandit Kings of Ancient China | 水滸伝 天命の誓い | Koei | Koei | None | Turn-based strategy | NES, MS-DOS, Amiga OS, Macintosh[1] | 1989 |
| BASTARD!! ONLINE | 暗黒の破壊神Online | Shaft | Tecmo | Bastard!! | Platform | Microsoft Windows | Cancelled |
| Berserk and the Band of the Hawk | ベルセルク無双 | Omega Force | Koei Tecmo | Berserk | Action role-playing, hack and slash | PlayStation 3, PlayStation 4, PlayStation Vita, Microsoft Windows | 2016 |
| Bladestorm: The Hundred Years' War | ブレイドストーム -百年戦争 | Omega Force | Koei | None | Historical action/strategy | PlayStation 3, Xbox 360, PlayStation 4 and Xbox One (Nightmare Remake) | 2007 |
| Blue Reflection | ブルー リフレクション 幻に舞う少女の剣 | Gust | Koei Tecmo | None | Role-playing | PlayStation 4, PlayStation Vita | 2017 |
| Bomb Jack | ボンジャック | Tehkan | Tehkan | Bomb Jack | Platform | Arcade | 1984 |
| Bomb Jack II | ボンジャックII | Tehkan | Tehkan | Bomb Jack | Platform | Arcade | 1986 |
| Bomb Jack Twin | | NMK | Tecmo | Bomb Jack | Platform | Arcade | 1993 |
| Brandish | ブランディッシュ | Nihon Falcom/Koei | Koei | Brandish | Action role-playing | SNES | 1994 |
| Breaker | | Tecmo | Tecmo | None | Co-op shooter | PlayStation 2 | Cancelled |
| Buddy Mission BOND | バディミッション BOND | Ruby Party | Nintendo | None | Action-adventure | Nintendo Switch | 2021 |
| Captain Tsubasa | キャプテン翼 | Tecmo | Tecmo | Captain Tsubasa | Traditional soccer simulation | Family Computer | 1988 |
| Captain Tsubasa (Mega-CD video game) | キャプテン翼 | Tecmo | Tecmo | Captain Tsubasa | Traditional soccer simulation | Sega Mega-CD | 1994 |
| Captain Tsubasa 2 | キャプテン翼II スーパーストライカー | Tecmo | Tecmo | Captain Tsubasa | Traditional soccer simulation | Family Computer | 1990 |
| Captain Tsubasa 3: Koutei no Chousen | キャプテン翼III 皇帝の挑戦 | Tecmo | Tecmo | Captain Tsubasa | Traditional soccer simulation | Super Famicom | 1992 |
| Captain Tsubasa 4: Pro no Rival Tachi | キャプテン翼IV プロのライバルたち | Tecmo | Tecmo | Captain Tsubasa | Traditional soccer simulation | Super Famicom | 1993 |
| Captain Tsubasa 5: Hasha no Shogo Campione | キャプテン翼V 覇者の称号カンピオーネ | Tecmo | Tecmo | Captain Tsubasa | Traditional soccer simulation | Super Famicom | 1994 |
| Celtic Tales: Balor of the Evil Eye | ケルトの聖戦 | Koei | Koei | None | Medieval fantasy simulation[2] | MS-DOS | 1995 |
| Champion Jockey: G1 Jockey & Gallop Racer | | Koei | Tecmo Koei | None | Horse racing | PlayStation 3, Wii, Xbox 360 | 2011 |
| Champion Jockey Special | | Koei | Tecmo Koei | None | Horse racing | Nintendo Switch | 2017 |
| Ciel Nosurge | シェルノサージュ〜失われた星へ捧ぐ詩 | Gust | Tecmo Koei | Surge Concerto | Life simulation | PlayStation Vita | 2012 |
| Crimson Sea | 紅の海 | Koei | Koei | Crimson Sea | Third-person shooter | Xbox | 2002 |
| Crimson Sea 2 | 紅の海2 | Koei | Koei | Crimson Sea | Third-person shooter | PlayStation 2 | 2004 |
| Croc: Legend of the Gobbos | | Argonaut Games | Koei | Croc | Platform | PlayStation | 1997 |
| Croc 2 | | Argonaut Games | Koei | Croc | Platform | PlayStation | 1999 |
| Colosseum: Road to Freedom | | GOSHOW/Ertain | Koei | None | Hack and slash | PlayStation 2 | 2005 |
| Daikoukai Jidai III: Costa del Sol | 大航海時代III | Koei | Koei | Uncharted Waters | Historical role-playing | Microsoft Windows | 1996 |
| Daikoukai Jidai IV: Porto Estado | 大航海時代IV | Koei | Koei | Uncharted Waters | Historical role-playing | PlayStation, Microsoft Windows, PlayStation Portable, Nintendo DS, mobile phones | 1999 |
| Daikoukai Jidai V: Road to Zipang | 大航海時代V | Koei | Koei | Uncharted Waters | Historical role-playing | Microsoft Windows | 2014 |
| Daikoukai Jidai Gaiden | 大航海時代 Gaiden | Koei | Koei | Uncharted Waters | Historical role-playing | PlayStation, Sega Saturn | 1997 |
| Danchi Zuma no Yuuwaku | 団地妻の誘惑 | Koei | Koei | None | Erotic simulation | FM-7, FM-8, MSX, PC-8801, PC-9801, Sharp X1 | 1983 |
| Dead or Alive | デッド オア アライブ | Team Ninja | Tecmo | Dead or Alive | Fighting | Arcade, Sega Saturn, PlayStation | 1996 |
| Dead or Alive 2 | デッド オア アライブ2 | Team Ninja | Tecmo | Dead or Alive | Fighting | Arcade, Dreamcast, PlayStation 2 | 1999 |
| Dead or Alive 3 | デッド オア アライブ3 | Team Ninja | Tecmo | Dead or Alive | Fighting | Xbox | 2001 |
| Dead or Alive 4 | デッド オア アライブ4 | Team Ninja | Tecmo | Dead or Alive | Fighting | Xbox 360 | 2005 |
| Dead or Alive 5 | デッド オア アライブ5 | Team Ninja | Tecmo | Dead or Alive | Fighting | PlayStation 3, Xbox 360, PlayStation Vita | 2012 |
| Dead or Alive 5 Last Round | デッド オア アライブLast Round | Team Ninja | Koei Tecmo | Dead or Alive | Fighting | PlayStation 3, PlayStation 4, Xbox 360, Xbox One, Microsoft Windows, Arcade | 2015 |
| Dead or Alive 5 Ultimate | デッド オア アライブ5 ULTIMATE | Team Ninja | Tecmo | Dead or Alive | Fighting | PlayStation 3, Xbox 360 | 2013 |
| Dead or Alive 6 | デッド オア アライブ6 | Team Ninja | Tecmo | Dead or Alive | Fighting | PlayStation 4, Xbox One, Microsoft Windows | 2019 |
| Dead or Alive: Code Chronos | | Team Ninja | Tecmo Koei | Dead or Alive | Fighting | Xbox 360 | Cancelled |
| Dead or Alive: Dimensions | デッド オア アライブ ディメンションズ | Team Ninja | Tecmo Koei | Dead or Alive | Fighting | Nintendo 3DS[3][4] | 2011 |
| Dead or Alive Online | 生死格鬥 | Team Ninja | Tecmo | Dead or Alive | Fighting | Microsoft Windows | 2008 |
| Dead or Alive Paradise | デッド オア アライブ Paradise | Team Ninja | Tecmo | Dead or Alive | Fighting | PlayStation Portable | 2010 |
| Dead or Alive Xtreme Beach Volleyball | デッド オア アライブ XTREME BEACH VOLLEYBALL | Team Ninja | Tecmo | Dead or Alive | Fighting | Xbox | 2003 |
| Dead or Alive Xtreme 2 | デッド オア アライブ XTREME 2 | Team Ninja | Tecmo | Dead or Alive | Fighting | Xbox 360 | 2006 |
| Dead or Alive Xtreme 3 | デッド オア アライブ XTREME 3 | Team Ninja | Koei Tecmo | Dead or Alive | Fighting | PlayStation 4, PlayStation Vita | 2016 |
| Dead or Alive Ultimate | デッド オア アライブULTIMATE | Team Ninja | Tecmo | Dead or Alive | Fighting | Xbox | 2004 |
| Deception III: Dark Delusion | 蒼魔灯 | Tecmo | Tecmo | Deception | Strategy-RPG | PlayStation | 1999 |
| Deception IV: Blood Ties | 影牢 ダークサイド・プリンセス | Tecmo | Tecmo | Deception | Strategy-RPG | PlayStation Vita, PlayStation 3 | 2014 |
| Deception IV: The Nightmare Princess | 影牢 ～もう1人のプリンセス | Tecmo | Tecmo | Deception | Strategy-RPG | PlayStation Vita, PlayStation 3, PlayStation 4 | 2015 |
| Derby Musou | ダービー無双 | Tecmo | Tecmo | Samurai Warriors | Hack and slash | Microsoft Windows | 2014 |
| Destrega | デストレーガ | Omega Force | Koei | None | Fighting | PlayStation | 1998 |
| Disgaea: Hour of Darkness | 魔界戦記ディスガイア | Nippon Ichi Software | Koei | Disgaea | Tactical role-playing | PlayStation 2 | 2004 |
| Disgaea 2: Cursed Memories | 魔界戦記ディスガイア2 | Nippon Ichi Software | Koei | Disgaea | Tactical role-playing | PlayStation 2 | 2006 |
| Dissidia Final Fantasy NT | ディシディア ファイナルファンタジー NT | Team Ninja | Square Enix | Final Fantasy | Fighting | PlayStation 4 | 2018 |
| Dokodemo Rasshou! Pachislo Sengen | | Tecmo | Tecmo | Rakushou! Pachi-Slot Sengen | Slot machine simulation | PlayStation Portable | 2005 |
| Dynasty Kingdoms | | Koei | Koei | Romance of the Three Kingdoms | Card | iOS | 2013 |
| Dynasty Tactics | 三國志戦記 | Koei | Koei | Romance of the Three Kingdoms | Tactical role-playing game | PlayStation 2 | 2002 |
| Dynasty Tactics 2 | 三國志戦記2 | Koei | Koei | Romance of the Three Kingdoms | Tactical role-playing game | PlayStation 2 | 2003 |
| Dynasty Warriors | 三國無双 | Omega Force | Koei | Dynasty Warriors | Fighting | PlayStation | 1997 |
| Dynasty Warriors | 真・三國無双 | Omega Force | Koei | Dynasty Warriors | Hack and slash | PlayStation Portable | 2004 |
| Dynasty Warriors 2 | 真・三國無双 | Omega Force | Koei | Dynasty Warriors | Hack and slash, tactical action | PlayStation 2 | 2000 |
| Dynasty Warriors 3 | 真・三國無双2 | Omega Force | Koei | Dynasty Warriors | Hack and slash, tactical action | PlayStation 2, Xbox | 2001 |
| Dynasty Warriors 3: Xtreme Legends | 真・三國無双2 猛将伝 | Omega Force | Koei | Dynasty Warriors | Hack and slash, tactical action | PlayStation 2 | 2002 |
| Dynasty Warriors 4 | 真・三國無双3 | Omega Force | Koei | Dynasty Warriors | Hack and slash, tactical action | PlayStation 2, Xbox | 2003 |
| Dynasty Warriors 4: Empires | 真・三國無双3 Empires | Omega Force | Koei | Dynasty Warriors | Hack and slash, tactical action | PlayStation 2 | 2004 |
| Dynasty Warriors 4 Hyper | 真・三國無双3 ハイパー | Omega Force | Koei | Dynasty Warriors | Hack and slash, tactical action | Microsoft Windows | 2005 |
| Dynasty Warriors 4: Xtreme Legends | 真・三國無双3 猛将伝 | Omega Force | Koei | Dynasty Warriors | Hack and slash, tactical action | PlayStation 2 | 2003 |
| Dynasty Warriors 5 | 真・三國無双4 | Omega Force | Koei | Dynasty Warriors | Hack and slash, tactical action | PlayStation 2, Xbox | 2005 |
| Dynasty Warriors 5: Empires | 真・三國無双4 Empires | Omega Force | Koei | Dynasty Warriors | Hack and slash, tactical action | PlayStation 2, Xbox 360 | 2006 |
| Dynasty Warriors 5 Special | 真・三國無双4 Special | Omega Force | Koei | Dynasty Warriors | Hack and slash, tactical action | Xbox 360, Microsoft Windows | 2005 |
| Dynasty Warriors 5: Xtreme Legends | 真・三國無双4 猛将伝 | Omega Force | Koei | Dynasty Warriors | Hack and slash, tactical action | PlayStation 2 | 2005 |
| Dynasty Warriors 6 | 真・三國無双5 | Omega Force | Koei | Dynasty Warriors | Hack and slash, tactical action | PlayStation 2, Xbox 360, Microsoft Windows | 2007 |
| Dynasty Warriors 6: Empires | 真・三國無双5 Empires | Omega Force | Koei | Dynasty Warriors | Hack and slash, tactical action | PlayStation 3, PlayStation Portable, Xbox 360 | 2009 |
| Dynasty Warriors 6 Special | 真・三國無双5 Special | Omega Force | Koei | Dynasty Warriors | Hack and slash, tactical action | PlayStation 2 | 2008 |
| Dynasty Warriors 7 | 真・三國無双6 | Omega Force | Koei | Dynasty Warriors | Hack and slash, tactical action | PlayStation 3, Xbox 360 | 2011[5] |
| Dynasty Warriors 8 | 真・三國無双7 | Omega Force | Koei | Dynasty Warriors | Hack and slash, tactical action | PlayStation 3, Xbox 360, Microsoft Windows | 2013 |
| Dynasty Warriors 8: Empires | 真・三國無双7 Empires | Omega Force | Koei | Dynasty Warriors | Hack and slash, tactical action | PlayStation 3, PlayStation 4, Microsoft Windows, Nintendo Switch | 2014 |
| Dynasty Warriors 8: Xtreme Legends | 真・三國無双7 猛将伝 | Omega Force | Koei | Dynasty Warriors | Hack and slash, tactical action | PlayStation 3, PlayStation 4, Microsoft Windows | 2013 |
| Dynasty Warriors 9 | 真・三國無双8 | Omega Force | Koei Tecmo | Dynasty Warriors | Hack and slash, tactical action | PlayStation 4, Xbox One, Microsoft Windows | 2018 |
| Dynasty Warriors 9 Empires | 真・三國無双8 Empires | Omega Force | Koei Tecmo | Dynasty Warriors | Hack and slash, tactical action | PlayStation 4, Xbox One, Microsoft Windows, Nintendo Switch | 2022 |
| Dynasty Warriors Advance | 真・三國無双 ADVANCE | Omega Force | Koei (Japan)
Nintendo | Dynasty Warriors | Hack and slash, tactical action | Game Boy Advance | 2005 |
| Dynasty Warriors DS: Fighter's Battle | 真・三國無双 DS ファイターズバトル | Omega Force | Koei | Dynasty Warriors | Tactical action | Nintendo DS | 2007 |
| Dynasty Warriors: Godseekers | 真・三國無双 英傑伝 | Omega Force | Koei Tecmo | Dynasty Warriors | Role-playing | PlayStation 3, PlayStation 4, PlayStation Vita | 2016 |
| Dynasty Warriors: Gundam | ガンダム無双 | Omega Force | Koei | Dynasty Warriors
Gundam | Action role-playing, hack and slash | PlayStation 3, Xbox 360 | 2007 |
| Dynasty Warriors: Gundam 2 | ガンダム無双2 | Omega Force | Koei | Dynasty Warriors
Gundam | Action role-playing, hack and slash | PlayStation 2, PlayStation 3, Xbox 360 | 2008 |
| Dynasty Warriors: Gundam 3 | ガンダム無双3 | Omega Force | Koei | Dynasty Warriors
Gundam | Action role-playing, hack and slash | PlayStation 3, Xbox 360 | 2010 |
| Dynasty Warriors: Gundam Reborn | 真・ガンダム無双 | Koei/Omega Force | Bandai Namco Entertainment | Dynasty Warriors
Gundam | Action role-playing, hack and slash | PlayStation 3, PlayStation Vita | 2013 |
| Dynasty Warriors: Gundam Special | ガンダム無双 Special | Omega Force | Koei | Dynasty Warriors
Gundam | Action role-playing, hack and slash | PlayStation 2 | 2008 |
| Dynasty Warriors Mahjong | 雀・三國無双 | Omega Force | Koei | Dynasty Warriors | Board | PlayStation 2, PlayStation Portable, Nintendo DS | 2006 |
| Dynasty Warriors Next | 真・三國無双 NEXT | Omega Force | Koei | Dynasty Warriors | Hack and slash | PlayStation Vita | 2011 |
| Dynasty Warriors Online | 雀・三國無双 | Tecmo Koei | Tecmo Koei | Dynasty Warriors | MMOG | Microsoft Windows, PlayStation 3 | 2006 |
| Dynasty Warriors: Strikeforce | 真・三國無双 Multi Raid | Omega Force | Koei | Dynasty Warriors | Hack and slash | PlayStation Portable | 2009 |
| Dynasty Warriors: Strikeforce 2 | 真・三國無双 Multi Raid 2 | Omega Force | Koei | Dynasty Warriors | Hack and slash | PlayStation Portable | 2010 |
| Dynasty Warriors: Unleashed | 真・三國無双 斬 | Nexon | Koei | Dynasty Warriors | Hack and slash | iOS, Android | 2017 |
| Dynasty Warriors Vol. 2 | 真・三國無双 2nd Evolution | Omega Force | Koei | Dynasty Warriors | Action role-playing, hack and slash | PlayStation Portable | 2006 |
| Fairy Tail | | Gust | Koei Tecmo | Fairy Tail | Role-playing | PlayStation 4, Nintendo Switch, Microsoft Windows | 2020[6] |
| Fatal Frame | 零 ～zero～ | Tecmo | Tecmo | Fatal Frame | Survival horror | PlayStation 2, Xbox | 2001 |
| Fatal Frame II: Crimson Butterfly | 零～紅い蝶～ | Tecmo | Tecmo | Fatal Frame | Survival horror | PlayStation 2 | 2003 |
| Fatal Frame II: Crimson Butterfly - Director's Cut | 零～紅い蝶～ | Tecmo | Tecmo | Fatal Frame | Survival horror | Xbox | 2004 |
| Fatal Frame III: The Tormented | 零～刺青の聲～ | Tecmo | Tecmo | Fatal Frame | Survival horror | PlayStation 2 | 2005 |
| Fatal Frame IV | 零～月蝕の仮面～ | Tecmo | Nintendo | Fatal Frame | Survival horror | Wii | 2008 |
| Spirit Camera: The Cursed Memoir | 心霊カメラ ～憑いてる手帳～ | Koei Tecmo | Nintendo | Fatal Frame | Survival horror | Nintendo 3DS | 2012 |
| Project Zero 2: Wii Edition | 零 〜眞紅の蝶〜 (Zero: Deep Crimson Butterfly) | Koei Tecmo | Nintendo | Fatal Frame | Survival horror | Wii | 2012 |
| Fatal Frame: Maiden of the Black Water | 零 ～濡鴉ノ巫女～ (Zero: Nuregarasu no Miko) | Koei Tecmo | Nintendo | Fatal Frame | Survival horror | Wii U | 2014 |
| Fatal Inertia | | Koei Canada | Koei | None | Racing | PlayStation 3, Xbox 360 | 2007 |
| Fate/Samurai Remnant | | Omega Force | Koei Tecmo | Fate/stay night | Hack and slash | Nintendo Switch, PlayStation 4, PlayStation 5, Microsoft Windows | 2023 |
| Final Star Force | ファイナルスターフォース | Tecmo | Tecmo | None | Shoot 'em up | Arcade | 1992 |
| Fire 'n Ice | | Tecmo | Tecmo | Solomon's Key | Puzzle | Arcade | 1993 |
| Fire Emblem Warriors | ファイアーエムブレム無双 | Omega Force, Team Ninja | JP: Koei Tecmo WW: Nintendo | Fire Emblem
Warriors | Hack and slash | Nintendo Switch, New Nintendo 3DS | 2017 |
| Fire Emblem: Three Houses | ファイアーエムブレム 風花雪月 | Intelligent Systems, Koei Tecmo | Nintendo | Fire Emblem | Tactical role-playing | Nintendo Switch | 2019 |
| Fire Emblem Warriors: Three Hopes | ファイアーエムブレム無双 風花雪月 | Omega Force, Team Ninja | JP: Koei Tecmo WW: Nintendo | Fire Emblem
Warriors | Hack and slash | Nintendo Switch | 2022 |
| Fist of the North Star: Ken's Rage | 北斗無双 (Hokuto Musō) | Omega Force | Tecmo Koei | Fist of the North Star | Beat 'em up | PlayStation 3, Xbox 360 | 2010[5] |
| Fist of the North Star: Ken's Rage 2 | 真・北斗無双 (Shin Hokuto Musō) | Koei | Tecmo Koei | Fist of the North Star | Beat 'em up | PlayStation 3, Xbox 360, Wii U | 2012 |
| G1 Jockey | | Koei | Koei | G1 Jockey | Horse racing simulation | PlayStation 2 | 2001 |
| G1 Jockey 2 | | Koei | Koei | G1 Jockey | Horse racing simulation | PlayStation 2 | 2001 |
| G1 Jockey 3 | | Koei | Koei | G1 Jockey | Horse racing simulation | PlayStation 2 | 2003 |
| G1 Jockey 4 | | Koei | Koei | G1 Jockey | Horse racing simulation | PlayStation 2 | 2005 |
| G1 Jockey 4 2007 | | Koei | Koei | G1 Jockey | Horse racing simulation | PlayStation 2, PlayStation 3 | 2007 |
| Gallop Racer | ギャロップレーサー | Tecmo | Tecmo | Gallop Racer | Horse racing simulation | PlayStation | 1996 |
| Gallop Racer 2 | ギャロップレーサー2 -ONE AND ONLY ROAD TO VICTORY- | Tecmo | Tecmo | Gallop Racer | Horse racing simulation | PlayStation | 1997 |
| Gallop Racer 2000 | ギャロップレーサー2000 | Tecmo | Tecmo | Gallop Racer | Horse racing simulation | PlayStation | 2000 |
| Gallop Racer 2001 | ギャロップレーサー2001 | Tecmo | Tecmo | Gallop Racer | Horse racing simulation | PlayStation 2 | 2001 |
| Gallop Racer 2003: A New Breed | ギャロップレーサー2003 | Tecmo | Tecmo | Gallop Racer | Horse racing simulation | PlayStation 2 | 2002 |
| Gallop Racer 2004 | ギャロップレーサー2004 | Tecmo | Tecmo | Gallop Racer | Horse racing simulation | PlayStation 2 | 2004 |
| Gallop Racer 2006 | ギャロップレーサー2006 | Tecmo | Tecmo | Gallop Racer | Horse racing simulation | PlayStation 2 | 2006 |
| Gemfire | アクタリオン | Koei | Koei | None | Medieval fantasy simulation | MSX, NES, Super NES, Mega Drive/Genesis, MS-DOS, NEC PC-9801, FM Towns, Sharp X68000, NEC PC-8801, Microsoft Windows | 1991 |
| Genghis Khan | 蒼き狼と白き牝鹿・ジンギスカン | Koei | Koei | Aoki Ōkami to Shiroki Mejika | Historical turn-based strategy | MSX, NES, Amiga, MS-DOS | 1987 |
| Genghis Khan II: Clan of the Gray Wolf | 蒼き狼と白き牝鹿・元朝秘史 | Koei | Koei | Aoki Ōkami to Shiroki Mejika | Historical turn-based strategy | PC-88, PC-98, MSX2, X68000, SNES, Mega Drive, MS-DOS | 1992 |
| Genghis Khan: Aoki Ookami to Shiroki Mejika IV | チンギスハーン・蒼き狼と白き牝鹿IV | Koei | Koei | Aoki Ōkami to Shiroki Mejika | Historical turn-based strategy | Microsoft Windows, PlayStation | 1998 |
| Geten no Hana | 下天の華 | Ruby Party | Koei | None | Dating sim | PlayStation Portable, PlayStation Vita | 2013 |
| The Girls of Dead or Alive: Blackjack | | Team Ninja | Tecmo | Dead or Alive | Mobile | iOS | 2009 |
| Gitaroo Man | ギタルマン | iNiS/Koei | Koei | Gitaroo Man | Rhythm/music game | PlayStation 2, PlayStation Portable | 2001 |
| Gitaroo Man Lives! | ギタルマン ライブ | iNiS/Koei | Koei | Gitaroo Man | Rhythm/music game | PlayStation Portable | 2006 |
| GunGriffon: Allied Strike | | Game Arts | Tecmo | GunGriffon | Mech sim | Xbox | 2004 |
| Guzzler | | Tehkan | Tehkan | None | maze | Arcade | 1983 |
| Harukanaru Toki no Naka de | 遙かなる時空の中で (From a Faraway Time) | Ruby Party | Koei | Harukanaru Toki no Naka de | Otome adventure | PlayStation | 2000 |
| Harukanaru Toki no Naka de 2 | 遙かなる時空の中で2 | Ruby Party | Koei | Harukanaru Toki no Naka de | Otome adventure | PlayStation 2 | 2001 |
| Harukanaru Toki no Naka de 3 | 遙かなる時空の中で3 | Ruby Party | Koei | Harukanaru Toki no Naka de | Otome adventure | PlayStation 2 | 2004 |
| Harukanaru Toki no Naka de 3 izayoiki | 遙かなる時空の中で3 十六夜記 | Ruby Party | Koei | Harukanaru Toki no Naka de | Otome adventure | PlayStation 2 | 2005 |
| Harukanaru Toki no Naka de 3 unmei no rabirinsu | 遙かなる時空の中で3 運命の迷宮 | Ruby Party | Koei | Harukanaru Toki no Naka de | Otome adventure | PlayStation 2 | 2006 |
| Harukanaru Toki no Naka de 4 | 遙かなる時空の中で4 | Ruby Party | Koei | Harukanaru Toki no Naka de | Otome adventure | PlayStation 2 | 2008 |
| Harukanaru Toki no Naka de 5 | 遙かなる時空の中で5 | Ruby Party | Koei | Harukanaru Toki no Naka de | Otome adventure | PlayStation 2 | 2011 |
| Harukanaru Toki no Naka de 5 kazahanaki | 遙かなる時空の中で5 風花記 | Ruby Party | Koei | Harukanaru Toki no Naka de | Otome adventure | PlayStation 2 | 2012 |
| Harukanaru Toki no Naka de 6 | 遙かなる時空の中で6 | Ruby Party | Koei | Harukanaru Toki no Naka de | Otome adventure | PlayStation Portable, PlayStation Vita | 2015 |
| Harukanaru Toki no Naka de Banjo Yugi | 遙かなる時空の中で 盤上遊戯 | Ruby Party | Koei | Harukanaru Toki no Naka de | Otome adventure | PlayStation | 2003 |
| Harukanaru Toki no Naka de Hachiyosho | 遙かなる時空の中で ～八葉抄～ | Ruby Party | Koei | Harukanaru Toki no Naka de | Otome adventure | PlayStation 2 | 2005 |
| Harukanaru Toki no Naka de Hisutori | 遙かなる時空の中で ヒストリー | Ruby Party | Koei | Harukanaru Toki no Naka de | Otome adventure | PlayStation 2 | 2005 |
| Harukanaru Toki no Naka de Maihitoyo | 遙かなる時空の中で 舞一夜 | Ruby Party | Koei | Harukanaru Toki no Naka de | Otome adventure | PlayStation 2 | 2006 |
| Harukanaru Toki no Naka de Yume no Ukihashi | 遙かなる時空の中で 夢浮橋 | Ruby Party | Koei | Harukanaru Toki no Naka de | Otome adventure | Nintendo DS | 2008 |
| Harukanaru Toki no Naka de Yume no Ukihashi Special | 遙かなる時空の中で 夢浮橋 Special | Ruby Party | Koei | Harukanaru Toki no Naka de | Otome adventure | PlayStation 2 | 2009 |
| Head On | | Sega | Tecmo | None | Driving, maze | Arcade | 1979 |
| Heir of Zendor | | Koei | Koei | None | Strategy | Sega Saturn | 1997 |
| Hermina and Culus: Atelier Lilie Another Story | ヘルミーナとクルス 〜リリーのアトリエ もう一つの物語〜 | Gust | Koei | Atelier | Role-playing | PlayStation 2 | 2001 |
| Hyakuman-nin no Nobunaga no Yabō | 100万人の信長の野望 | Mobage | Koei | Nobunaga's Ambition | Grand strategy | Microsoft Windows | 2010 |
| Nobunaga's Ambition: Nyapuri! | | Koei Tecmo | Koei Tecmo | Nobunaga's Ambition | Grand strategy | iOS, Android | 2018 |
| Hyrule Warriors | ゼルダ無双 | Omega Force, Team Ninja | Koei Tecmo | The Legend of Zelda
Dynasty Warriors | Action, hack and slash | Wii U | 2014 |
| Hyrule Warriors Legends | ゼルダ無双 ハイラルオールスターズ | Omega Force, Team Ninja | Koei Tecmo | The Legend of Zelda
Dynasty Warriors | Action, hack and slash | Nintendo 3DS | 2016 |
| Hyrule Warriors: Definitive Edition | ゼルダ無双 ハイラルオールスターズ DX | Omega Force, Team Ninja | Koei Tecmo | The Legend of Zelda
Dynasty Warriors | Action, hack and slash | Nintendo Switch | 2018 |
| Hyrule Warriors: Age of Calamity | ゼルダ無双 厄災の黙示録 | Omega Force | JP: Koei Tecmo WW: Nintendo | The Legend of Zelda
Dynasty Warriors | Action, hack and slash | Nintendo Switch | 2020 |
| Inindo: Way of the Ninja | 伊忍道 打倒信長 | Koei | Koei | Rekoeition | Historical role-playing | PC-8801SR, PC-9801, MSX2, FM Towns, Sharp X68000, MS-DOS (Chinese), SNES, Windows 98 | 1991 |
| Ishin no Arashi | 維新の嵐 | Koei | Koei | Ishin no Arashi | Historical role-playing | PC-8801, PC-9801, NES, Sega Saturn, PlayStation, X68000, MSX, FM-7, FM Towns, X1 | 1988 |
| Ishin no Arashi Bakumatsu Shishiden | 維新の嵐 幕末志士伝 | Koei | Koei | Ishin no Arashi | Historical role-playing | Microsoft Windows, PlayStation, mobile phones | 1998 |
| Ishin no Arashi Shippuu Ryoumaden | 維新の嵐 疾風龍馬伝 | Koei | Koei | Ishin no Arashi | Historical role-playing | Nintendo DS | 2010 |
| J League Go Go Goal! | Ｊリーグ ゴーゴーゴール！ | Tecmo | Tecmo | None | Sports | Sega Saturn | 1997 |
| Kagero: Deception II | 影牢～刻命館真章～ | Tecmo | Tecmo | Deception | Strategy-RPG | PlayStation | 1998 |
| Kamigami no Daichi Kojiki Gaiden | | Koei | Koei | Rekoeition | Historical role-playing | FM Towns, PC-9801 | 1993 |
| Kessen | 決戦 | Koei | Koei | Kessen | Historical RTS | PlayStation 2 | 2000 |
| Kessen II | 決戦 II | Koei | Koei | Kessen | Historical RTS | PlayStation 2 | 2001 |
| Kessen III | 決戦III | Koei | Koei | Kessen | Historical RTS | PlayStation 2 | 2004 |
| Kin'iro no Corda | 金色のコルダ, lit. Golden Corda | Ruby Party | Koei | Kin'iro no Corda | Dating sim | Microsoft Windows, PlayStation 2, PlayStation Portable | 2003 |
| Kin'iro no Corda 2 | 金色のコルダ2 | Ruby Party | Koei | Kin'iro no Corda | Dating sim | PlayStation 2 | 2007 |
| Kin'iro no Corda 2 encore | 金色のコルダ2 アンコール | Ruby Party | Koei | Kin'iro no Corda | Dating sim | PlayStation 2 | 2007 |
| Kin'iro no Corda 2 f | 金色のコルダ2 f | Ruby Party | Koei | Kin'iro no Corda | Dating sim | PlayStation Portable | 2009 |
| Kin'iro no Corda 2 f encore | 金色のコルダ2 f アンコール | Ruby Party | Koei | Kin'iro no Corda | Dating sim | PlayStation Portable | 2009 |
| Kin'iro no Corda 3 | 金色のコルダ3 | Ruby Party | Koei | Kin'iro no Corda | Dating sim | PlayStation 2, PlayStation Portable, mobile phones | 2010 |
| Kin'iro no Corda 3 AnotherSky feat. Amane Gakuen | 金色のコルダ3 AnotherSky feat. Amane Gakuen | Ruby Party | Koei | Kin'iro no Corda | Dating sim | PlayStation Portable, PlayStation Vita | 2014 |
| Kin'iro no Corda 3 AnotherSky feat. Jinnan | 金色のコルダ3 AnotherSky feat. Jinnan | Ruby Party | Koei | Kin'iro no Corda | Dating sim | PlayStation Portable, PlayStation Vita | 2014 |
| Kin'iro no Corda 3 AnotherSky feat. Shiseikan | 金色のコルダ3 AnotherSky feat. Shiseikan | Ruby Party | Koei | Kin'iro no Corda | Dating sim | PlayStation Portable, PlayStation Vita | 2014 |
| Kin'iro no Corda 3: Full Voice Special | 金色のコルダ３フルボイスSpecial | Ruby Party | Koei | Kin'iro no Corda | Dating sim | PlayStation Portable, Nintendo 3DS, PlayStation Vita | 2013 |
| Kin'iro no Corda 4 | 金色のコルダ4 | Ruby Party | Koei | Kin'iro no Corda | Dating sim | PlayStation Vita | 2016 |
| Kin'iro no Corda Octave | 金色のコルダ オクターヴ | Ruby Party | Koei | Kin'iro no Corda | Dating sim | Mobile phones | 2017 |
| Kurogane no Houkou: Warship Commander | 鋼鉄の咆哮 ウォーシップコマンダー | Microcabin | Koei | Kurogane no Houkou | Vehicle simulation | PlayStation 2, Microsoft Windows | 2001 |
| La Pucelle: Tactics | ラ・ピュセル 光の聖女伝説 | Nippon Ichi Software | Koei | None | Tactical role-playing | PlayStation 2, PlayStation Portable | 2005 |
| Leading Company | リーディングカンパニー | Koei | Koei | Koei Executive | Business simulation | FM Towns, NEC PC-9801, Sharp X68000, Super Famicom | 1993 |
| L'Empereur | ランペルール | Koei | Koei | None | Historical strategy | NES | 1991 |
| Liberty or Death | | Koei | Koei | Historical Simulation | Historical turn-based strategy | MS-DOS, Super NES, Genesis/Mega Drive | 1994 |
| LoveφSummit | ラブφサミット | Ruby Party | Koei/CWS Brains | Neoromance | Visual novel | Mobile phones | 2009 |
| Makai Kingdom: Chronicles of the Sacred Tome | Phantom Kingdom (ファントム・キングダム, Fantomu Kingudamu) | Nippon Ichi Software | Nippon Ichi Software/Koei | Disgaea | Tactical RPG | PlayStation 2, PlayStation Portable | 2005 |
| Marvel Ultimate Alliance 3: The Black Order | | Team Ninja | Nintendo | Marvel Ultimate Alliance | Action-adventure | Nintendo Switch | 2019 |
| Metroid: Other M | | Team Ninja/Nintendo | Nintendo | Metroid | Action-adventure | Wii | 2010 |
| Mighty Bomb Jack | | Tecmo | Tecmo | Bomb Jack | Platform | Arcade | 1987 |
| MISS PRINCESS: Miss Puri! | MISS PRINCESS ミスプリ! | Ruby Party | Koei | Neoromance | Dating sim | Nintendo DS | 2011 |
| Mobile Shin Sangokumusō | | Koei | Koei | Dynasty Warriors | Mobile | Mobile phones | 2008 |
| Monster Rancher | モンスターファーム | Tecmo | Tecmo | Monster Rancher | Life simulation | PlayStation | 1997 |
| Monster Rancher 2 | モンスターファーム2 | Tecmo | Tecmo | Monster Rancher | Life simulation | PlayStation | 1999 |
| Monster Rancher 3 | モンスターファーム3 | Tecmo | Tecmo | Monster Rancher | Life simulation | PlayStation 2 | 2001 |
| Monster Rancher 4 | モンスターファーム4 | Tecmo | Tecmo | Monster Rancher | Life simulation | PlayStation 2 | 2003 |
| Monster Rancher Advance | モンスターファームアドバンス | Tecmo | Tecmo | Monster Rancher | Life simulation | Game Boy Advance | 2001 |
| Monster Rancher Advance 2 | モンスターファームアドバンス2 | Tecmo | Tecmo | Monster Rancher | Life simulation | Game Boy Advance | 2002 |
| Monster Rancher Battle Card Game | モンスターファームバトルカードGB | GRC | Tecmo | Monster Rancher | Strategy | Game Boy Color | 1999 |
| Monster Rancher Battle Card: Episode II | モンスターファームバトルカード | GRC | Tecmo | Monster Rancher | Strategy | Game Boy Color | 2000 |
| Monster Rancher DS | モンスターファームDS2 甦る!マスターブリーダー伝説! | Cing | Tecmo | Monster Rancher | Life simulation | Nintendo DS | 2008 |
| Monster Rancher EVO | モンスターファーム5 サーカスキャラバン | Tecmo | Tecmo | Monster Rancher | Life simulation | PlayStation 2 | 2005 |
| Monster Rancher Explorer | ソロモン | Tecmo | Tecmo | Solomon's Key
Monster Rancher | Puzzle | Game Boy Color | 2000 |
| Monster Rancher Hop-A-Bout | モンスターファームジャンプ | Tecmo | Tecmo | Monster Rancher | Life simulation | PlayStation | 2000 |
| Monster Rancher POP | モンスターファームPOP | Tecmo | Tecmo | Monster Rancher | Life simulation | Mobile phones | 2004 |
| Monster Rancher POP 2 | モンスターファームPOP2 | Tecmo | Tecmo | Monster Rancher | Life simulation | Mobile phones | 2004 |
| Mouri Motonari: Chikai no Sanshi | 毛利元就 誓いの三矢 | Koei | Koei | Eiketsuden | Tactical role-playing | Microsoft Windows, Sega Saturn, PlayStation | 1997 |
| Musou Orochi Z | 無双オロチ Z | Omega Force | Koei | Warriors | Beat 'em up | PlayStation 3, Microsoft Windows | 2009 |
| Mystic Heroes | バトル封神 | Koei | Koei | None | Beat 'em up | GameCube, PlayStation 2 | 2002 |
| Naval Ops: Commander | 鋼鉄の咆哮2 ウォーシップコマンダー | Microcabin | Koei | Kurogane no Houkou | Vehicle simulation | PlayStation 2, Microsoft Windows | 2002 |
| Naval Ops: Warship Gunner | 鋼鉄の咆哮2 ウォーシップガンナー | Microcabin | Koei | Kurogane no Houkou | Vehicle simulation | PlayStation 2 | 2003 |
| Naval Ops: Warship Gunner 2 | ウォーシップガンナー2 鋼鉄の咆哮 | Koei | Koei | Kurogane no Houkou | Vehicle simulation | PlayStation 2, PlayStation Portable | 2006 |
| Nelke & the Legendary Alchemists: Ateliers of the New World | ネルケと伝説の錬金術士たち ～新たな大地のアトリエ～ | Gust | Koei Tecmo | Atelier | Role-playing | Microsoft Windows, PlayStation 4, PlayStation Vita, PlayStation TV, Nintendo Switch | 2019 |
| Neo Angelique ~Abyss~ | ネオアンジェリーク | Ruby Party | Koei | Angelique
Neoromance | Dating sim | PlayStation 2 | 2008 |
| Nights of Azure | よるのないくに (Yoru no Nai Kuni) | Gust | Koei Tecmo | Nights of Azure | Action role-playing | PlayStation 3, PlayStation 4, PlayStation Vita, Microsoft Windows | 2015 |
| Nights of Azure 2: Bride of the New Moon | よるのないくに2 | Gust | Koei Tecmo | Nights of Azure | Action role-playing | PlayStation 3, PlayStation 4, PlayStation Vita, Microsoft Windows, Nintendo Switch | 2017 |
| Night Life | ナイトライフ | Koei | Koei | None | Eroge | NEC PC-8801 | 1982 |
| Ninja Gaiden (2004 video game) | NINJA GAIDEN | Team Ninja | Tecmo | Ninja Gaiden | Action-adventure, hack and slash | Xbox | 2004 |
| Ninja Gaiden (arcade game) | 忍者龍剣伝 | Tecmo | Tecmo | Ninja Gaiden | Beat 'em up | Arcade | 1988 |
| Ninja Gaiden (NES video game) | 忍者龍剣伝 | Tecmo | Tecmo | Ninja Gaiden | Platform | NES | 1989 |
| Ninja Gaiden II | NINJA GAIDEN 2 | Team Ninja | Microsoft Game Studios | Ninja Gaiden | Action-adventure, hack and slash | Xbox 360 | 2008 |
| Ninja Gaiden II: The Dark Sword of Chaos | 忍者龍剣伝II 暗黒の邪神剣 | Tecmo | Tecmo | Ninja Gaiden | Platform | NES | 1990 |
| Ninja Gaiden III: The Ancient Ship of Doom | 忍者龍剣伝III 黄泉の方船 | Tecmo | Tecmo | Ninja Gaiden | Platform | NES | 1991 |
| Ninja Gaiden 3 | NINJA GAIDEN 3 | Team Ninja | Tecmo | Ninja Gaiden | Action-adventure, hack and slash | PlayStation 3, Xbox 360 | 2012 |
| Ninja Gaiden 3: Razor's Edge | NINJA GAIDEN 3 Razor's Edge | Team Ninja | Tecmo Koei | Ninja Gaiden | Action-adventure, hack and slash | Wii U, PlayStation 3, Xbox 360 | 2012 |
| Ninja Gaiden 3DS | NINJA GAIDEN 3DS | Team Ninja | Tecmo Koei | Ninja Gaiden | Action-adventure, hack and slash | Nintendo 3DS | Cancelled |
| Ninja Gaiden Black | NINJA GAIDEN Black | Team Ninja | Tecmo | Ninja Gaiden | Action-adventure, hack and slash | Xbox | 2005 |
| Ninja Gaiden Dragon Sword | NINJA GAIDEN Dragon Sword | Team Ninja | Tecmo | Ninja Gaiden | Action-adventure | Nintendo DS | 2008 |
| Ninja Gaiden Episode 1: Destiny | | Tecmo | Tecmo | Ninja Gaiden | Platform | Mobile phones | 2004 |
| Ninja Gaiden Hurricane Pack: Volume I | | Team Ninja | Tecmo | Ninja Gaiden | Action-adventure, hack and slash | Xbox | 2004 |
| Ninja Gaiden: Hurricane Pack Vol. 2 | | Team Ninja | Tecmo | Ninja Gaiden | Action-adventure, hack and slash | Xbox | 2004 |
| Ninja Gaiden: Master Collection | NINJA GAIDEN Master Collection | Team Ninja | Koei Tecmo | Ninja Gaiden | Action-adventure, Hack and slash | PlayStation 4, Nintendo Switch, Xbox One, Microsoft Windows | 2021 |
| Ninja Gaiden Shadow | 忍者龍剣伝GB 摩天楼決戦 | Tecmo/Natsume | Tecmo | Ninja Gaiden | Action | Game Boy | 1991 |
| Ninja Gaiden Sigma | NINJA GAIDEN Σ | Team Ninja | Tecmo | Ninja Gaiden | Action-adventure, hack and slash | PlayStation 3 | 2007 |
| Ninja Gaiden Sigma 2 | NINJA GAIDEN Σ 2 | Team Ninja | Tecmo | Ninja Gaiden | Action-adventure, hack and slash | PlayStation 3, PlayStation Vita | 2009 |
| Ninja Gaiden Trilogy | 忍者龍剣伝 巴 | Tecmo | Tecmo | Ninja Gaiden | Platform | SNES | 1995 |
| Nioh | 仁王 | Team Ninja | Koei Tecmo | Nioh | Action role-playing | PlayStation 4, Microsoft Windows[7] | 2017[8] |
| Nioh 2 | 仁王2 | Team Ninja | Koei Tecmo | Nioh | Action role-playing | PlayStation 4, Microsoft Windows | 2020 |
| Nobunaga's Ambition | 信長の野望・全国版 | Koei | Koei | Nobunaga's Ambition | Grand strategy | PC-88SR, Family Computer, Super Famicom, Mega Drive, PC Engine Super CD-ROM², PlayStation, mobile phones, Microsoft Windows, iOS, Wii, Wii U | 1986 |
| Nobunaga's Ambition II | 信長の野望・全国版 | Koei | Koei | Nobunaga's Ambition | Grand strategy | Family Computer, PlayStation, Sega Saturn, MS-DOS, mobile phones | 1988 |
| Nobunaga's Ambition: Lord of Darkness | 信長の野望・武将風雲録 | Koei | Koei | Nobunaga's Ambition | Grand strategy | Family Computer, Super Famicom, Mega Drive, PC Engine Super CD-ROM², PlayStation, Microsoft Windows, Game Boy Advance, mobile phones | 1990 |
| Nobunaga no Yabō | 信長の野望 | Koei | Koei | Nobunaga's Ambition | Grand strategy | Microsoft Windows, Sega Saturn, Game Boy, Game Boy Color, WonderSwan, PlayStation, Nintendo DS, Nintendo 3DS, mobile phones | 1983 |
| Nobunaga no Yabō: Haōden | 信長の野望・覇王伝 | Koei | Koei | Nobunaga's Ambition | Grand strategy | Family Computer, Super Famicom, PlayStation, Microsoft Windows, Mega CD, 3DO, Mac OS, mobile phones | 1992 |
| Nobunaga no Yabō Internet | 信長の野望Internet | Koei | Koei | Nobunaga's Ambition | Grand strategy | Microsoft Windows | 1998 |
| Nobunaga no Yabō: Kakushin | 信長の野望・革新 | Koei | Koei | Nobunaga's Ambition | Grand strategy | Microsoft Windows, PlayStation 2, Wii | 2005 |
| Nobunaga no Yabō Online | 信長の野望Online | Koei | Koei | Nobunaga's Ambition | Grand strategy | Microsoft Windows, PlayStation 2, PlayStation 3 | 2003 |
| Nobunaga no Yabō: Ranseiki | 信長の野望・嵐世記 | Koei | Koei | Nobunaga's Ambition | Grand strategy | Microsoft Windows, PlayStation 2, Xbox | 2001 |
| Nobunaga no Yabō: Reppūden | 信長の野望・烈風伝 | Koei | Koei | Nobunaga's Ambition | Grand strategy | Dreamcast, Microsoft Windows, PlayStation, PlayStation Portable, Macintosh, Nintendo DS, mobile phones | 1999 |
| Nobunaga no Yabō: Shōseiroku | 信長の野望・将星録 | Koei | Koei | Nobunaga's Ambition | Grand strategy | Dreamcast, Sega Saturn, PlayStation, PlayStation Portable, Macintosh, mobile phones | 1997 |
| Nobunaga no Yabō: Sōtensoku | 信長の野望・蒼天録 | Koei | Koei | Nobunaga's Ambition | Grand strategy | Microsoft Windows, PlayStation 2, PlayStation Portable | 2002 |
| Nobunaga's Ambition: Taishi | 信長の野望・大志 | Koei | Koei | Nobunaga's Ambition | Grand strategy | Microsoft Windows, PlayStation 4, Nintendo Switch | 2017 |
| Nobunaga no Yabō: Tendō | 信長の野望・天道 | Koei | Koei | Nobunaga's Ambition | Grand strategy | Microsoft Windows, PlayStation 3, Xbox 360 | 2009 |
| Nobunaga no Yabō: Tenka Sōsei | 信長の野望・天下創世 | Koei | Koei | Nobunaga's Ambition | Grand strategy | Microsoft Windows, PlayStation 2 | 2003 |
| Nobunaga no Yabō: Tenshōki | 信長の野望・天翔記 | Koei | Koei | Nobunaga's Ambition | Grand strategy | PC-98, FM Towns, DOS/V, Super Famicom, Sega Saturn, PlayStation, PlayStation Portable, Macintosh, mobile phones | 1994 |
| Nobunaga's Ambition: Sphere of Influence | 信長の野望・創造 | Koei | Koei | Nobunaga's Ambition | Grand strategy | PlayStation 3, PlayStation 4, PlayStation Vita, Microsoft Windows, Nintendo Switch | 2013 |
| Oda Nobunaga Den | 織田信長伝 | Koei | Koei | Eiketsuden | Tactical role-playing | Microsoft Windows, PlayStation | 1998 |
| One Piece: Pirate Warriors | ワンピース 海賊無双 | Omega Force | Bandai Namco Games | One Piece | Action | PlayStation 3 | 2012 |
| One Piece: Pirate Warriors 2 | ワンピース 海賊無双 2 | Omega Force | Bandai Namco Games | One Piece | Action | PlayStation 3, PlayStation Vita | 2013 |
| One Piece: Pirate Warriors 3 | ワンピース 海賊無双 3 | Omega Force | Bandai Namco Games | One Piece | Action | PlayStation 3, PlayStation Vita, PlayStation 4, Microsoft Windows | 2015 |
| Operation Europe: Path to Victory | ヨーロッパ戦線 | Koei | Koei | None | Turn-based strategy | FM Towns, MS-DOS, NEC PC-9801, Genesis, Super NES | 1993 |
| Opoona | オプーナ | ArtePiazza | Koei | None | Role-playing | Wii | 2007 |
| Oyaku de Asoberu DS Ehon: Ukkari Penelope | 親子で遊べるDS絵本 うっかりペネロペ | Tecmo | Tecmo | None | Visual novel | Nintendo DS | 2008 |
| Persona 5 Strikers | ペルソナ5 スクランブル ザ ファントム ストライカーズ | Omega Force, P-Studio | Atlus | Persona
Dynasty Warriors | Hack and slash | Nintendo Switch, PlayStation 4, Microsoft Windows | 2020 |
| Pinball Action | | Tehkan | Tecmo | None | Pinball | Arcade | 1985 |
| Pleiads | プレアデス | Tehkan | Tehkan | None | Shoot 'em up | Arcade | 1981 |
| Phantom Brave | ファントム・ブレイブ | Nippon Ichi Software | Koei | None | Tactical role-playing | PlayStation 2, Wii, PlayStation Portable, Microsoft Windows | 2004 |
| Pokémon Conquest | ポケモン＋ノブナガの野望 | Tecmo Koei | The Pokémon Company | Nobunaga's Ambition
Pokémon | Role-playing | Nintendo DS | 2012 |
| Pop Cutie! Street Fashion Simulation | | Koei | Koei | None | Business simulation | Nintendo DS | 2008 |
| Prey the Stars | | Koei | Koei | None | Action | Nintendo DS | 2008 |
| Progenitor | | Koei | Koei | Rekoeition | Historical role-playing | PC-9801 | 1994 |
| Project Progressive | | Team Ninja | Tecmo | None | | Xbox 360 | Cancelled |
| P.T.O.: Pacific Theater of Operations | 提督の決断 | Koei | Koei | PTO | Strategy | Mega Drive, SNES | 1992 |
| P.T.O. II: Pacific Theater of Operations | 提督の決断II | Koei | Koei | PTO | Strategy | SNES | 1995 |
| P.T.O. IV: Pacific Theater of Operations | 提督の決断IV | Koei | Koei | PTO | Strategy | PlayStation 2, Microsoft Windows | 2002 |
| Quantum Theory | クウォンタム セオリー | Team Tachyon | Tecmo | None | Third-person shooter | PlayStation 3, Xbox 360 | 2010 |
| Radia Senki: Reimeihen | ラディア戦記 黎明篇 | Tecmo | Tecmo | None | Action role-playing | Family Computer | 1991 |
| Rasshou! Pachislo Sengen | | Tecmo | Tecmo | Rakushou! Pachi-Slot Sengen | Slot machine simulation | PlayStation 2 | 2003 |
| Rasshou! Pachislo Sengen 2: Dekadan | | Tecmo | Tecmo | Rakushou! Pachi-Slot Sengen | Slot machine simulation | PlayStation 2 | 2004 |
| Rasshou! Pachislo Sengen 3: Rio de Carnival, Juujika 600 Shiki | | Tecmo | Tecmo | Rakushou! Pachi-Slot Sengen | Slot machine simulation | PlayStation 2 | 2005 |
| Rasshou! Pachislo Sengen 4: Shin Mogu Mogu Fuurinkasan Rio de Carnival | | Tecmo | Tecmo | Rakushou! Pachi-Slot Sengen | Slot machine simulation | PlayStation 2 | 2006 |
| Rakushou! Pachi-Slot Sengen 5: Rio Paradise | | Tecmo | Tecmo | Rakushou! Pachi-Slot Sengen | Slot machine simulation | PlayStation 2 | 2007 |
| Rakushou! Pachi-Slot Sengen 6: Rio 2 Cruising Vanadis | | Tecmo | Tecmo | Rakushou! Pachi-Slot Sengen | Slot machine simulation | PlayStation 2 | 2007 |
| Real: Another Edition | | Tecmo | Tecmo | Fatal Frame | Survival horror | Mobile phones | 2004 |
| Right Brain Game | | Tecmo | Tecmo | None | Educational | Mobile phones | 2004 |
| Rise of the Phoenix | 項劉記 | Koei | Koei | None | Historical turn-based strategy | SNES, NEC PC-9801, FM Towns, X68000, PlayStation | 1993 |
| Rise of the Ronin | | Team Ninja | Sony Interactive Entertainment | | | PlayStation 5 | 2024 |
| Romance of the Three Kingdoms | 三國志 | Koei | Koei | Romance of the Three Kingdoms | Historical turn-based strategy | Amiga, MSX, MSX2, NES, Microsoft Windows | 1985 |
| Romance of the Three Kingdoms 2 | | Koei | Koei | Romance of the Three Kingdoms | Strategy | iOS | 2010 |
| Romance of the Three Kingdoms II | 三國志II | Koei | Koei | Romance of the Three Kingdoms | Historical turn-based strategy | Amiga, MSX2, NES, SNES, Genesis, Microsoft Windows, Genesis, WonderSwan | 1989 |
| Romance of the Three Kingdoms III: Dragon of Destiny | 三國志III | Koei | Koei | Romance of the Three Kingdoms | Historical turn-based strategy | SNES, Genesis, Microsoft Windows | 1992 |
| Romance of the Three Kingdoms IV: Wall of Fire | 三國志IV | Koei | Koei | Romance of the Three Kingdoms | Historical turn-based strategy | SNES, Sega 32X, Sega Saturn, PlayStation, Microsoft Windows, Game Boy Advance | 1994 |
| Romance of the Three Kingdoms V | 三國志V | Koei | Koei | Romance of the Three Kingdoms | Historical turn-based strategy | Amiga, MSX2, NES, SNES, Genesis, Microsoft Windows, Genesis, WonderSwan | 1996 |
| Romance of the Three Kingdoms VI: Awakening of the Dragon | 三國志VI | Koei | Koei | Romance of the Three Kingdoms | Historical turn-based strategy | Dreamcast, PlayStation, Microsoft Windows | 1998 |
| Romance of the Three Kingdoms VII | 三國志VII | Koei | Koei | Romance of the Three Kingdoms | Historical turn-based strategy | PlayStation 2, Microsoft Windows | 2000 |
| Romance of the Three Kingdoms VIII | 三國志VIII | Koei | Koei | Romance of the Three Kingdoms | Historical turn-based strategy | PlayStation 2, Microsoft Windows | 2001 |
| Romance of the Three Kingdoms IX | 三國志IX | Koei | Koei | Romance of the Three Kingdoms | Historical turn-based strategy | PlayStation 2, Microsoft Windows | 2003 |
| Romance of the Three Kingdoms X | 三國志X | Koei | Koei | Romance of the Three Kingdoms | Historical turn-based strategy | PlayStation 2, Microsoft Windows | 2004 |
| Romance of the Three Kingdoms XI | 三國志XI | Koei | Koei | Romance of the Three Kingdoms | Historical turn-based strategy | PlayStation 2, Microsoft Windows, Wii | 2006 |
| Romance of the Three Kingdoms XII | 三國志XII | Koei | Koei | Romance of the Three Kingdoms | Historical turn-based strategy | PlayStation 3, Microsoft Windows, Wii U | 2012 |
| Romance of the Three Kingdoms XIII | 三國志XIII | Koei | Koei Tecmo | Romance of the Three Kingdoms | Historical turn-based strategy | PlayStation 3, PlayStation 4, Xbox One, Microsoft Windows | 2016 |
| Romance of the Three Kingdoms Touch | | Koei | Koei | Romance of the Three Kingdoms | Strategy | iOS | 2009 |
| Rygar | アルゴスの戦士 | Tecmo | Tecmo | Rygar | Platform | Arcade, Sharp X68000, C64, ZX Spectrum, NES, Master System, Lynx, mobile phones, Virtual Console, PlayStation 4 | 1986 |
| Rygar: The Battle of Argus | アルゴスの戦士 マッスルインパクト | Team Tachyon | Tecmo | Rygar | Action-adventure | Wii | 2008 |
| Rygar: The Legendary Adventure | アルゴスの戦士 | Tecmo | Tecmo | Rygar | Action-adventure | PlayStation 2 | 2002 |
| Saboten Bombers | | NMK/Tecmo | Tecmo | None | Platform | Arcade | 1992 |
| Saihai no Yukue | 采配のゆくえ | Omega Force | Koei | None | Strategy | Nintendo DS | 2008 |
| Saiyuki: Journey West | 西遊記 Saiyuki | Koei | Koei | None | Tactical role-playing | PlayStation | 1999 |
| Samurai Cats | のぶニャがの野望 | Koei | Koei | Nobunaga's Ambition | Grand strategy | Microsoft Windows | 2011 |
| Samurai Warriors | 戦国無双 | Omega Force | Koei | Samurai Warriors | Hack and slash | PlayStation 2, Xbox | 2004 |
| Samurai Warriors: Chronicles | 戦国無双 クロニクル | Omega Force | Koei | Samurai Warriors | Hack and slash | Nintendo 3DS | 2011[9] |
| Samurai Warriors: Chronicles 3 | 戦国無双 クロニクル3 | Omega Force | Koei | Samurai Warriors | Hack and slash | PlayStation Vita, Nintendo 3DS | 2014 |
| Samurai Warriors: Katana | 戦国無双 KATANA | Omega Force | Koei | Samurai Warriors | Hack and slash | Wii | 2007 |
| Samurai Warriors: Spirit of Sanada | 戦国無双 真田丸 | Omega Force | Koei | Samurai Warriors | Hack and slash | PlayStation 3, PlayStation 4, PlayStation Vita, Microsoft Windows, Nintendo Switch | 2016 |
| Samurai Warriors: Xtreme Legends | 戦国無双 猛将伝 | Omega Force | Koei | Samurai Warriors | Hack and slash | PlayStation 2 | 2004 |
| Samurai Warriors: State of War | 激・戦国無双 | Omega Force | Koei | Samurai Warriors | Hack and slash | PlayStation Portable | 2005 |
| Samurai Warriors 2 | 戦国無双2 | Omega Force | Koei | Samurai Warriors | Hack and slash | PlayStation 2, Xbox 360, Microsoft Windows | 2006 |
| Samurai Warriors 2: Empires | 戦国無双2 Empires | Omega Force | Koei | Samurai Warriors | Hack and slash | PlayStation 2, Xbox 360, Microsoft Windows | 2006 |
| Samurai Warriors 2: Xtreme Legends | 戦国無双2 猛将伝 | Omega Force | Koei | Samurai Warriors | Hack and slash | PlayStation 2, Xbox 360, Microsoft Windows | 2007 |
| Samurai Warriors 3 | 戦国無双3 | Omega Force
Nintendo | Koei (Japan)
Nintendo | Samurai Warriors | Hack and slash | Wii | 2009 |
| Samurai Warriors 3: Xtreme Legends | 戦国無双3 猛将伝 | Omega Force | Koei | Samurai Warriors | Hack and slash | Wii | 2011 |
| Samurai Warriors 3 Z | 戦国無双3Z | Omega Force | Koei | Samurai Warriors | Hack and slash | PlayStation 3 | 2011 |
| Samurai Warriors 3 Z: Special | 戦国無双3Z | Omega Force | Koei | Samurai Warriors | Hack and slash | PlayStation 3 | 2012 |
| Samurai Warriors 4 | 戦国無双4 | Omega Force | Koei | Samurai Warriors | Hack and slash | PlayStation 3, PlayStation 4, PlayStation Vita | 2014 |
| Samurai Warriors 4-II | 戦国無双4-II | Omega Force | Koei | Samurai Warriors | Hack and slash | PlayStation 3, PlayStation 4, PlayStation Vita, Microsoft Windows | 2014 |
| Samurai Warriors 4: Empires | 戦国無双4 | Omega Force | Koei | Samurai Warriors | Hack and slash | PlayStation 3, PlayStation 4, PlayStation Vita | 2015 |
| Sangokushi Battlefield | 三國志 Battlefield | Koei | Koei | Romance of the Three Kingdoms | Real-time strategy | Windows 98 | 2002 |
| Sangokushi Eiketsuden | 三國志英傑伝 | Koei | Koei | Eiketsuden | Tactical role-playing | Microsoft Windows, SNES, Game Boy Advance, PlayStation, MS-DOS, Sega Saturn | 1995 |
| Sangokushi Internet | 三國志 Internet | Koei | Koei | Romance of the Three Kingdoms | Strategy | Microsoft Windows | 1999 |
| Sangokushi Koumeiden | 三國志孔明伝 | Koei | Koei | Eiketsuden | Tactical role-playing | Microsoft Windows, PlayStation, Sega Saturn, Game Boy Advance | 1996 |
| Sangokushi Legion | 三國志レギオン | Koei | Koei | Romance of the Three Kingdoms | Real-time strategy | iOS, Android | 2017 |
| Sangokushi Mobile | 三國志Mobile | Koei | Koei | Romance of the Three Kingdoms | Mobile | Mobile phones | 2002 |
| Sangokushi Mobile 2 | 三國志Mobile 2 | Koei | Koei | Romance of the Three Kingdoms | Mobile | Mobile phones | 2004 |
| Sangokushi Mobile 3 | 三國志Mobile 3 | Koei | Koei | Romance of the Three Kingdoms | Mobile | Mobile phones | 2006 |
| Sangokushi Mobile 4 | 三國志Mobile 4 | Koei | Koei | Romance of the Three Kingdoms | Mobile | Mobile phones | 2008 |
| Sangokushi Online | 三國志Online | Koei | Koei | Romance of the Three Kingdoms | Mobile | Mobile phones | 2008 |
| Sangokushi Retsuden: Ransei no Eiyū Tachi | 三國志曹操伝 | Sega | Sega/Koei | None | Tactical role-playing | SMD | 1991 |
| Sangokushi Sousouden | 三國志曹操伝 | Koei | Koei | Eiketsuden | Tactical role-playing | Microsoft Windows, mobile phones | 1998 |
| Sasami Kisscomi | | Team Tachyon | Tecmo | None | Puzzle | iPhone, iPod Touch | 2009 |
| Sengoku Musou Shoot | 戦国無双 シュート | Tecmo | Tecmo | Samurai Warriors | Hack and slash | iOS, Android | 2014 |
| Senjyo | センジョー | Tehkan | Tehkan | None | Shooter | Arcade, MSX, Xbox | 1983 |
| Persona 3 | ペルソナ3 | Atlus | Atlus/Koei | Megami Tensei
Persona | Role-playing | PlayStation 2, PlayStation Portable | 2008 |
| Persona 3 FES | ペルソナ3フェス | Atlus | Atlus/Koei | Megami Tensei
Persona | Role-playing | PlayStation 2, PlayStation Portable | 2008 |
| Shin Sangokushi | | Koei Tecmo | Koei Tecmo | Romance of the Three Kingdoms | Strategy | iOS, Android | 2018 |
| Shin Sangokumusō Vs | | Koei | Koei | Dynasty Warriors | Hack and slash | Nintendo 3DS | 2018 |
| Silkworm | | Ronald Pieket Weeserik | Tecmo | None | Horizontal scrolling shooter | Arcade, Amiga, Amstrad CPC, Atari ST, Commodore 64, Nintendo Entertainment System, ZX Spectrum | 1988 |
| Söldnerschild | ゼルドナーシルト | Sega | Koei | Rekoeition | Historical role-playing | Sega Saturn | 1997 |
| Söldnerschild Special | ゼルドナーシルト Special | Koei | Koei | Rekoeition | Historical role-playing | PlayStation | 1998 |
| Solomon's Club | ソロモンズ倶楽部 | Tecmo | Tecmo | None | Action
Puzzle | Game Boy | 1991 |
| Solomon's Key | ソロモンの鍵 | Tecmo | Tecmo | Solomon's Key | Puzzle | Arcade, Amiga, Amstrad CPC, Atari ST, C64, MS-DOS, Famicom Disk System, Master System, mobile phones, NES, ZX Spectrum, Arcade Archives | 1986 |
| Soreike Kokology | | Sega | Sega/Tecmo | None | Puzzle | Arcade | 1991 |
| Soreike Kokology 2 | | Sega | Sega/Tecmo | None | Puzzle | Arcade | 1993 |
| Soul Master | ソウルマスター | Koei | Koei | None | Tactical role-playing | PlayStation | 1997 |
| SPRay | | Eko System | Tecmo | None | Action-adventure | Wii | 2008 |
| Star Force | スターフォース | Tehkan | Tehkan | Star Force | Shoot 'em up | Arcade, NES, Virtual Console | 1984 |
| Stop That Roach! | ホイホイ ゲームボーイ版 | Koei | Koei | None | Action/puzzle | Game Boy | 1994 |
| Stranger of Paradise: Final Fantasy Origin | Sutorenjā Obu Paradaisu: Fainaru Fantajī Orijin (ストレンジャー オブ パラダイス ファイナルファンタジー オリジン) | Team Ninja | Square Enix | Final Fantasy | Action role-playing | Microsoft Windows, PlayStation 4, PlayStation 5, Xbox One, Xbox Series X/S. | 2022 |
| Strato Fighter | | Tecmo | Tecmo | None | Shooter | Arcade, Xbox | 1991 |
| Strike Gunner S.T.G. | エス・ティー・ジー | Athena | Tecmo | None | Shoot 'em up | Arcade, Super NES | 1991 |
| Super Blackjack | RIO BLACKJACK | Net | Tecmo | Rakushou! Pachi-Slot Sengen | Casino | Arcade | 2009 |
| Super Sangokushi | | Tecmo | Tecmo | Romance of the Three Kingdoms | Strategy | SNES | 1994 |
| Super Sangokushi 2 | | Tecmo | Tecmo | Romance of the Three Kingdoms | Strategy | SNES | 1991 |
| Super Shot Soccer | | Tecmo | Tecmo | None | Arcade-style traditional soccer simulation | PlayStation | 2002 |
| Super Star Force: Jikūreki no Himitsu | スーパースターフォース 時空暦の秘密 | Tecmo | Tecmo | Star Force | Shoot 'em up Adventure | Family Computer | 1986 |
| Super Swing Golf | | Ntreev Soft/Tecmo | Tecmo | Super Swing Golf | Sports, golf | Wii | 2006 |
| Super Swing Golf: Season 2 | | Team Tachyon | Tecmo | Super Swing Golf | Sports, golf | Wii | 2007 |
| Swimmer | スイマ一 | Tehkan | Centuri/Tecmo | None | Action | Arcade, Xbox | 1982 |
| Taikō Risshiden | 太閤立志伝 | Koei | Koei | Taikō Risshiden | Turn-based strategy | NEC PC-9801, Super Famicom, Genesis/Mega Drive, Wii | 1992 |
| Taikō Risshiden II | 太閤立志伝II | Koei | Koei | Taikō Risshiden | Turn-based strategy | Microsoft Windows, PlayStation | 1996 |
| Taikō Risshiden III | 太閤立志伝III | Koei | Koei | Taikō Risshiden | Turn-based strategy | Microsoft Windows, PlayStation | 1999 |
| Taikō Risshiden IV | 太閤立志伝IV | Koei | Koei | Taikō Risshiden | Turn-based strategy | Microsoft Windows, PlayStation Portable | 2001 |
| Taikō Risshiden V | 太閤立志伝V | Koei | Koei | Taikō Risshiden | Turn-based strategy | Microsoft Windows, PlayStation Portable | 2004 |
| Tecmo Baseball | | Tecmo | Tecmo | Tecmo | Sports, baseball | NES | 1989 |
| Tecmo Bowl | テクモボウル | Tecmo | Tecmo | Tecmo Bowl | Sports, American football | Arcade, NES, Famicom, PlayChoice-10, Game Boy, Virtual Console | 1987 |
| Tecmo Bowl: Kickoff | テクモボウル GB | Polygon Magic | Tecmo | Tecmo Bowl | Sports, American football | Nintendo DS | 2008 |
| Tecmo Bowl Throwback | | Southend Interactive/Tecmo | Tecmo | Tecmo Bowl | Sports, American football | Xbox 360 (XBLA), PlayStation 3 (PSN) | 2010 |
| Tecmo Classic Arcade | | Tecmo | Tecmo | None | Compilation | Xbox | 2005 |
| Tecmo Cup Soccer Game | | Tecmo | Tecmo | Captain Tsubasa | Sports, soccer | NES | 1988 |
| Tecmo Hit Parade | | Tecmo | Tecmo | None | Compilation | PlayStation 2 | 2004 |
| Tecmo Knight | ワイルドファング | Tecmo | Tecmo | None | Beat 'em up | Arcade | 1989 |
| Tecmo NBA Basketball | | Tecmo | Tecmo | Tecmo NBA Basketball | Basketball simulation | NES | 1992 |
| Tecmo's Secret of the Stars | アクタリオン | Tecmo | Tecmo | None | Role-playing | SNES | 1993 |
| Tecmo Sports: Bakuretsu King | | Tecmo | Tecmo | Tecmo | Sports | PlayStation 2 | 2006 |
| Tecmo Stackers | でろーんでろでろ | Tecmo | Tecmo | Tecmo | Puzzle | PlayStation, PlayStation Network | 1995 |
| Tecmo Super Baseball | | Tecmo | Tecmo | Tecmo | Sports, baseball | Super NES, Sega Genesis | 1994 |
| Tecmo Super Bowl | テクモスーパーボウル | Tecmo | Tecmo | Tecmo Bowl | Sports, American football | NES | 1991 |
| Tecmo Super Bowl II: Special Edition | テクモスーパーボウルII スペシャルエディション | Tecmo | Tecmo | Tecmo Bowl | Sports, American football | SNES, Mega Drive | 1994 |
| Tecmo Super Bowl III: Final Edition | | Tecmo | Tecmo | Tecmo Bowl | Sports, American football | SNES, Mega Drive | 1995 |
| Tecmo Super Hockey | | Tecmo | Tecmo | Tecmo | Sports, ice hockey | Sega Genesis | 1994 |
| Tecmo Super NBA Basketball | テクモスーパーNBAバスケットボール | Tecmo | Tecmo | Tecmo NBA Basketball | Basketball simulation | SNES, Sega Genesis | 1992 |
| Tecmo World Cup '90 | | Tecmo | Tecmo | Tecmo | Traditional soccer simulation | Arcade, Mega Drive | 1989 |
| Tecmo World Cup '92 | | Tecmo | Tecmo | Tecmo | Traditional soccer simulation | Arcade, Mega Drive | 1992 |
| Tecmo World Cup '93 | | SIMS | Sega/Tecmo | Tecmo | Traditional soccer simulation | Master System | 1993 |
| Tecmo World Cup '98 | | Tecmo | Tecmo | Tecmo | Traditional soccer simulation | Sega ST-V | 1998 |
| Tecmo World Cup Soccer | | Tecmo | Tecmo | Tecmo | Traditional soccer simulation | NES | 1990 |
| Tecmo World Golf | | Tecmo | Tecmo | Tecmo | Sports, soccer | PlayStation | 1996 |
| Tecmo World Soccer '96 | | SNK | Tecmo | Tecmo | Sports, soccer | Neo Geo | 1996 |
| Tecmo World Wrestling | | Tecmo | Tecmo | Tecmo | Sports, wrestling | NES | 1989 |
| Tecmo's Deception: Invitation to Darkness | 刻命館 | Tecmo | Tecmo | Deception | Strategy-RPG | PlayStation | 1996 |
| Tehkan World Cup | | Tecmo | Tecmo | Tecmo | Sports video game, soccer | Arcade, PlayStation 2, Xbox | 1985 |
| Teitoku no Ketsudan III | 提督の決断III | Koei | Koei | PTO | Strategy | PC-9801, Microsoft Windows, PlayStation, Sega Saturn | 1996 |
| Top Management | ファミコン トップマネジメント | Koei | Koei | Top Management | Business simulation | Family Computer, NEC PC-9801 | 1990 |
| Top Management II | トップマネジメントII | Koei | Koei | Top Management | Business simulation | Super Famicom, NEC PC-9801, Microsoft Windows | 1994 |
| Tōkidenshō Angel Eyes | 闘姫伝承 ANGEL EYES | Tecmo | Tecmo | None | Fighting | Arcade, PlayStation, PlayStation Network | 1996 |
| Tokobot | カラクリ | Tecmo | Tecmo | Tokobot | Platformer | PlayStation Portable | 2005 |
| Tokobot Plus: Mysteries of the Karakuri | コロボットアドベンチャー | Tecmo | Tecmo | Tokobot | Platformer | PlayStation 2 | 2006 |
| Toukiden: Kiwami | 討鬼伝 極 | Omega Force | Tecmo | Toukiden | Action role-playing | PlayStation Portable, PlayStation Vita, PlayStation 4, Microsoft Windows | 2014 |
| Toukiden: The Age of Demons | 討鬼伝 | Omega Force | Tecmo | Toukiden | Action role-playing | PlayStation Portable, PlayStation Vita | 2013 |
| Toukiden 2 | 討鬼伝2 | Omega Force | Tecmo | Toukiden | Action role-playing | PlayStation 3, PlayStation 4, PlayStation Vita | 2016 |
| Trapt | 影牢II: Dark Illusion | Tecmo | Tecmo | Deception | Action-Strategy | PlayStation 2 | 2005 |
| Trinity: Souls of Zill O'll | Trinity: Zill O'll Zero | Omega Force | Koei | Zill O'll | Action RPG | PlayStation 3 | 2010[5] |
| Tsuppari Ōzumō[10] | つっぱり大相撲 | Tecmo | Tecmo | Tsuppari Ōzumō | Sports video game, sumo | Family Computer, Virtual Console | 1987 |
| Tsuppari Ōzumō: Risshin Shusse Hen[10] | つっぱり大相撲 立身出世編 | Tecmo | Tecmo | Tsuppari Ōzumō | Sports video game, wrestling | Super Famicom | 1993 |
| Uncharted Waters | 大航海時代 (Dai Kōkai Jidai; lit. Great Navigation Era) | Koei | Koei | Uncharted Waters | Historical role-playing | MSX, NES, Sega Mega Drive, SNES | 1991 |
| Uncharted Waters: New Horizons | 大航海時代 New Horizons | Koei | Koei | Uncharted Waters | Historical role-playing | NEC PC-98, SNES, Sega Mega Drive/Genesis, PC, Sega Saturn, PlayStation, Virtual Console, mobile phones | 1994 |
| Uncharted Waters Online | 大航海時代Online | Koei | Koei | Uncharted Waters | Historical role-playing MMORPG | Microsoft Windows | 2010 |
| Undead Knights | アンデッドナイツ | Team Tachyon | Tecmo | None | Action-adventure | PlayStation Portable | 2009 |
| Under Night In-Birth II [Sys:Celes] | アンダーナイトインヴァース II シスタセレス | French-Bread, Arc System Works | Koei Tecmo | Under Night In-Birth | Fighting | PlayStation 4, PlayStation 5, Nintendo Switch, Microsoft Windows | 2024 |
| UNiSON | | Tecmo | Tecmo | None | Music | PlayStation 2 | 2000 |
| V-Goal Soccer '96 | | Tecmo | Tecmo | None | Sports, soccer | 3DO Interactive Multiplayer | 1996 |
| Warriors All-Stars | 無双☆スターズ (Musou Stars) | Omega Force | Koei Tecmo | Warriors | Hack and slash | PlayStation 4, PlayStation Vita, Microsoft Windows | 2017 |
| Warriors: Legends of Troy | TROY無双 | Koei Canada | Tecmo Koei | Warriors | Hack and slash | PlayStation 3, Xbox 360 | 2011 |
| Warriors Orochi | 無双 OROCHI | Omega Force | Koei | Warriors | Hack and slash | PlayStation 2, Xbox 360, Microsoft Windows, PlayStation Portable | 2007 |
| Warriors Orochi 2 | 無双 OROCHI 魔王再臨 | Omega Force | Koei | Warriors | Hack and slash | PlayStation 2, PlayStation Portable, Xbox 360 | 2008 |
| Warriors Orochi 3 | 無双 OROCHI 2 | Omega Force | Koei | Warriors | Hack and slash | PlayStation 3, Xbox 360 | 2012 |
| Warriors Orochi 3 Hyper | 無双 OROCHI 2 Hyper | Omega Force | Koei | Warriors | Hack and slash | Wii U | 2012 |
| Warriors Orochi 3 Special | 無双 OROCHI 2 Special | Omega Force | Koei | Warriors | Hack and slash | PlayStation Portable | 2012 |
| Warriors Orochi 3 Ultimate | 無双 OROCHI 2 Ultimate | Omega Force | Koei | Warriors | Hack and slash | PlayStation 3, PlayStation Vita, PlayStation 4, Xbox One, Nintendo Switch | 2013 |
| Warriors Orochi 4 | 無双 OROCHI 3 | Omega Force | Koei | Warriors | Hack and slash | Microsoft Windows, PlayStation 4, Xbox One, Nintendo Switch | 2018 |
| Wild Hearts | | Omega Force | Electronic Arts | None | Action role-playing | PlayStation 5, Microsoft Windows, Xbox Series X/S | 2023 |
| WinBack: Covert Operations | | Omega Force | Koei | None | Third-person shooter | Nintendo 64, PlayStation 2 | 1999 |
| Winning Post | ウイニングポスト | Tecmo Koei | Tecmo Koei | Winning Post | Horse racing, breeding simulation | X68000, Super Famicom, Mega CD, PC98, 3DO, PlayStation, Sega Saturn, Game Boy Advance | 1993 |
| Winning Post 2 | ウイニングポスト2 | Tecmo Koei | Tecmo Koei | Winning Post | Horse racing, breeding simulation | Super Famicom, PlayStation, Sega Saturn | 1995 |
| Winning Post 3 | ウイニングポスト3 | Tecmo Koei | Tecmo Koei | Winning Post | Horse racing, breeding simulation | PlayStation, Sega Saturn | 1997 |
| Winning Post 4 | ウイニングポスト4 | Tecmo Koei | Tecmo Koei | Winning Post | Horse racing, breeding simulation | PlayStation, Dreamcast | 1999 |
| Winning Post 5 | ウイニングポスト5 | Tecmo Koei | Tecmo Koei | Winning Post | Horse racing, breeding simulation | PlayStation 2 | 2001 |
| Winning Post 6 | ウイニングポスト6 | Tecmo Koei | Tecmo Koei | Winning Post | Horse racing, breeding simulation | PlayStation 2, PlayStation Portable, Microsoft Windows | 2003 |
| Winning Post 7 | ウイニングポスト7 | Tecmo Koei | Tecmo Koei | Winning Post | Horse racing, breeding simulation | PlayStation 2, PlayStation 3, Microsoft Windows, Wii, PlayStation Vita | 2005 |
| Winning Post 7 Maximum 2007 | ウイニングポスト7 Maximum 2007 | Tecmo Koei | Tecmo Koei | Winning Post | Horse racing, breeding simulation | PlayStation 2, PlayStation 3 | 2007 |
| Winning Post 7 Maximum 2008 | ウイニングポスト7 Maximum 2008 | Tecmo Koei | Tecmo Koei | Winning Post | Horse racing, breeding simulation | PlayStation 2, PlayStation 3, Microsoft Windows, Wii | 2008 |
| Winning Post 8 2017 | ウイニングポスト8 2017 | Koei Tecmo | Koei Tecmo | Winning Post | Horse racing, breeding simulation | PlayStation 3, PlayStation 4, PlayStation Vita, Microsoft Windows, Nintendo Switch | 2017 |
| Winning Post 8 2018 | ウイニングポスト8 2018 | Koei Tecmo | Koei Tecmo | Winning Post | Horse racing, breeding simulation | PlayStation 4, PlayStation Vita, Microsoft Windows, Nintendo Switch | 2018 |
| Winning Post 9 | ウイニングポスト9 | Koei Tecmo | Koei Tecmo | Winning Post | Horse racing, breeding simulation | Nintendo Switch | 2019 |
| Winning Post World | ウイニングポスト7 World | Tecmo Koei | Tecmo Koei | Winning Post | Horse racing, breeding simulation | PlayStation 2, PlayStation 3, Microsoft Windows, Wii | 2009 |
| Winning Post World 2010 | ウイニングポスト7 World 2010 | Tecmo Koei | Tecmo Koei | Winning Post | Horse racing, breeding simulation | PlayStation 2, PlayStation 3, Xbox 360, Wii | 2010 |
| Winning Post World 8 | ウイニングポスト World 8 | Koei Tecmo | Koei Tecmo | Winning Post | Horse racing, breeding simulation | PlayStation 3, PlayStation 4, PlayStation Vita, Microsoft Windows | 2014 |
| World Cup '94 | | Tecmo | Tecmo | World Cup | Sports, soccer | Arcade | 1994 |
| Wo Long: Fallen Dynasty | | Team Ninja | Koei Tecmo | | Action role-playing | Microsoft Windows, PlayStation 4, PlayStation 5, Xbox One, Xbox Series X/S. | 2023 |
| Yaiba: Ninja Gaiden Z | NINJA GAIDEN Z | Team Ninja | Tecmo | Ninja Gaiden | Hack and slash | PlayStation 3, Xbox 360, Microsoft Windows | 2014 |
| Yanya Caballista: City Skater | Yanya Caballista featuring Gawoo (ヤンヤ カバジスタ featuring Gawoo) | Koei | Koei | None | Skateboarding | PlayStation 2 | 2001 |
| Yo-kai Sangokushi | 妖怪三国志 | Level-5, Koei | Koei | Romance of the Three Kingdoms
Yo-kai Watch | Tactical role-playing | Nintendo 3DS | 2016 |
| Yo-kai Sangokushi: Kunitori Wars | 妖怪三国志 国盗りウォーズ | Level-5 | Koei Tecmo | Romance of the Three Kingdoms
Yo-kai Watch | Tactical role-playing | iOS, Android | 2018 |
| Zill O'll ~infinite plus~ | | Tecmo Koei | Tecmo Koei | Zill O'll | Role-playing | PlayStation Portable | 2009 |
| Zill O'll ~infinite~ | | Koei | Koei | Zill O'll | Role-playing | PlayStation 2 | 2005 |
| Zill O'll | | Koei | Koei | Zill O'll | Role-playing | PlayStation | 1999 |
