Main article: Kingdom Hearts II Final Mix In October 2021, it was announced that a cloud version of the game was in development for Nintendo Switch. The game was also released on Microsoft Windows exclusively via Epic Games Store on March 30, 2021. At the X019 event in November 2019, Shinji Hashimoto and Ichiro Hazama announced that this collection along with 1.5 and 2.8 would be released on the Xbox One in 2020 the collection was released for the platform on February 18, 2020.

In July 2017, Nomura spoke on bringing the collection to the Xbox One, saying he did not believe there was much demand for it outside of North America, but felt it could be a possibility after Square Enix completed development on Kingdom Hearts III. As with HD 1.5 Remix, the collection was developed mainly by the Square Enix 1st Production Department in Osaka, along with some help from Square Enix's Tokyo team. The collection was announced on October 14, 2013, exclusively for the PlayStation 3. Additionally, when IGN interviewed Shinji Hashimoto about Kingdom Hearts III, he stated that the studio would consider another HD collection if the reaction to the first one was positive enough. In the credits of Kingdom Hearts HD 1.5 Remix, clips of the games featured in this collection were shown, hinting at the collection. 2.5 Remix was re-released along with 1.5 Remix on the PlayStation 4 on March 28, 2017, on the Xbox One on February 18, 2020, on Windows via Epic Games Store on March 30, 2021, and a cloud version of the game for the Nintendo Switch was released on February 10, 2022. A third collection, Kingdom Hearts HD 2.8 Final Chapter Prologue, was released on January 24, 2017. Additionally, the collection features a cinematic remake of Kingdom Hearts Re:coded that features remastered cutscenes from the original game as well as new content. Kingdom Hearts HD 2.5 Remix includes Kingdom Hearts II Final Mix and Kingdom Hearts Birth by Sleep Final Mix in high definition and with trophy support.

A successor to the series' HD 1.5 Remix collection, it was released for the PlayStation 3 in Japan in October 2014 and internationally two months later. Kingdom Hearts HD 2.5 Remix is an HD remastered collection of three games in Square Enix's Kingdom Hearts series: Kingdom Hearts II, Birth by Sleep and Re:coded.

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