

In 2007, Nomura mentioned a desire to create a spin-off Kingdom Hearts game on a mobile platform and for it to feature gameplay slightly different than other titles in the series. Kingdom Hearts Birth by Sleep was directed by Tetsuya Nomura and co-directed by Tai Yasue. The title of the game is based on Kingdom Hearts II's and Kingdom Hearts II Final Mix's secret ending, "Birth by Sleep", a title which Nomura developed as he wanted a phrase having "by" as well as to use an English title like previous games. The development team changed the platform to the PlayStation Portable so as to make use of the PSP's functions such as co-operative and competitive multiplayer gameplay. The plot was completed, but development was halted six months after it began due to development of Kingdom Hearts Re:Chain of Memories.

During development of Kingdom Hearts II, the Osaka-based team had requested to be involved in a spin-off if one were to be made.ĭevelopment of the game began before the release of Kingdom Hearts II Final Mix. Birth by Sleep was developed by Square Enix's fifth Product Development Division, based in Osaka, the same team behind Kingdom Hearts Re:Chain of Memories, and uses the same graphical engine as Crisis Core: Final Fantasy VII. 9 Kingdom Hearts Birth by Sleep Final Mixĭevelopment of the game began in June 2005 and was originally intended for the PlayStation 2 with Sora as the prototype protagonist of the game.In September 2010, the Final Mix version was announced in Japan, which has the added features of the North American and European version, as well as some additional extras. The overseas release includes a number of new features, including the Sticker Album, a new boss, new Keyblades, abilities, mini-game maps, and songs, and the addition of Critical Mode. This game is the sixth in the series to be released, but is set first chronologically. Like Kingdom Hearts, Kingdom Hearts: Chain of Memories and Kingdom Hearts: Re:Coded the main theme song for the game is " Simple and Clean", performed by Utada Hikaru. The game's premise is the origins of the series' hero and villain, Sora and Xehanort, and delves deep into the mysteries of Xehanort's bleak past and forgotten memories as well as how Sora and Riku came to wield the Keyblade in the first place. Kingdom Hearts Birth by Sleep was developed by the same team that created Kingdom Hearts Re:Chain of Memories. The game's name is shared with the secret video at the end of Kingdom Hearts II Final Mix, " Birth by sleep", which depicts a stylized version of a scene from the game.

It was released in Japan on January 9, 2010, Septemin North America, and Septemin Europe. Kingdom Hearts Birth by Sleep is a Kingdom Hearts prequel published and developed by Square Enix for the Sony Playstation Portable (PSP).
