This title revealed what happened to the protagonist Aqua during her time lost in the Realm of Darkness. The other title, Kingdom Hearts 0.2: Birth by Sleep – A Fragmentary Passage, is an original game that takes place after the events of Dream Drop Distance. It includes events not shown in that game regarding the earliest parts of the series' story. The first, Kingdom Hearts χ Back Cover, is a 'cinematic' film based on the game Kingdom Hearts χ. The collection also includes two new pieces of content set in the Kingdom Hearts series. This title covers how protagonists Sora and Riku prepared for the return of the antagonist Master Xehanort. Kingdom Hearts HD 2.8 Final Chapter Prologue includes a high-definition remaster of Kingdom Hearts 3D: Dream Drop Distance. A cloud version of the game Nintendo Switch was announced in October 2021. A successor to the Kingdom Hearts HD 2.5 Remix game compilation, the new title was announced in September 2015 and released in January 2017 on PlayStation 4, February 2020 on Xbox One and March 2021 on Microsoft Windows. Kingdom Hearts HD 2.8 Final Chapter Prologue is a compilation of games from the Kingdom Hearts series, developed and published by Square Enix in collaboration with Disney Interactive Studios.
