Kingdom Hearts χ

Kingdom Hearts χ
Developer(s)Square Enix
Success
BitGroove
Publisher(s)Square Enix
Director(s)
Producer(s)Hironori Okayama
Designer(s)
  • Masahiro Ishihara
  • Yu Suzuki
  • Haruki Nakano
Programmer(s)Takahiro Hojo
Artist(s)
  • Tatsuya Kando
  • Takeshi Nagata
  • Akihito Nonami
Writer(s)Masaru Oka
Tetsuya Nomura
Composer(s)Yoko Shimomura
Tsuyoshi Sekito
SeriesKingdom Hearts
Platform(s)
ReleaseWeb browser
  • JP: July 18, 2013
Android, iOS
  • JP: September 3, 2015
  • NA: April 7, 2016
  • PAL: June 16, 2016
Fire OS
  • WW: January 29, 2019
Genre(s)Role-playing
Mode(s)Single-player, multiplayer

Kingdom Hearts χ, stylized as Kingdom Hearts χ[chi], is a Japanese role-playing browser game developed by Square Enix (in collaboration with Disney Interactive Studios), BitGroove and Success, and published by Square Enix for web browsers as the eighth installment in the Kingdom Hearts series. Gameplay involves players navigating a customized avatar through Disney-inspired worlds fighting enemies, along with taking down bosses in multiplayer matches in competition with other teams. A version of the game for mobile devices called Kingdom Hearts Unchained χ was released as the ninth installment of the series in Japan in September 2015, and worldwide in 2016.

In April 2017, Unchained χ was rebranded as Kingdom Hearts Union χ[Cross]. It was rebranded once again in June 2020 to Kingdom Hearts Union χ Dark Road with the release of the standalone game Kingdom Hearts Dark Road, accessed within Union χ. It was announced in February 2021 that Kingdom Hearts Union χ Dark Road would be shutting down its online features and transitioning into an offline app in May 2021. In August 2024, the game was delisted from all app stores.

Kingdom Hearts χ is a prequel to the Kingdom Hearts series as a whole, taking place centuries prior. It takes place before the Keyblade War, which established the organization of the Kingdom Hearts universe as of the original game. The player assumes the role of a Keyblade wielder who joins one of five factions led by Keyblade Masters fighting for control of the limited light existing in the world. Union χ acts as a sequel, retelling part of the story of Kingdom Hearts χ before diverging and telling a new story set after its events. The game's plot is connected to Kingdom Hearts III. The title refers to the χ-blade, a weapon central to the series' story arc.

The game was designed as a playing experience that could attract newcomers to the series. Its presentation was compared to that of a fairy tale, as depicting the usual style of the series would have been difficult on the platform. Tetsuya Nomura and Yoko Shimomura, veterans from the main series, returned as director and composer respectively. The game received favorable reception from critics. A companion film, Kingdom Hearts χ Back Cover, was released as part of Kingdom Hearts HD 2.8 Final Chapter Prologue in January 2017.