Overall, the gameplay of Kingdom Hearts Final Mix was modified so it would play more similarly to Kingdom Hearts II and Re:Chain of Memories, to create a more consistent play style throughout the series.

The camera works more similarly to that of Kingdom Hearts II, utilizing the right thumb stick to move the camera and allowing the player to click the R3 button to reset the camera behind Sora, as opposed to the original game which made use of the shoulder triggers L2 and R2 to position the camera. The original fourth command has been replaced by the introduction of Reaction Commands from Kingdom Hearts II and are triggered by pressing the Triangle Button. The command menu has been updated to include 'Attack', 'Magic', 'Items', and 'Summons' in the fourth slot, which was originally located as a sub-category beneath the 'Magic' menu. In the original and Final Mix versions of Kingdom Hearts, the command menu had four commands: Attack, Magic, Items, and a fourth context-sensitive slot that varied depending on what the player had targeted, where they were, etc. He is joined by Donald Duck, Goofy and other Disney characters who help him on his quest. Kingdom Hearts follows the adventures of Sora, a cheerful teenager who fights against the forces of darkness.

1.5 Remix was released in a single, combined collection with 2.5 Remix on the PlayStation 4 on March 28, 2017, on the Xbox One on February 18, 2020, on Microsoft Windows on March 30, 2021, and a cloud version of the game for Nintendo Switch was released on February 10, 2022. A second collection, Kingdom Hearts HD 2.5 Remix, was released in 2014 while a third collection, Kingdom Hearts HD 2.8 Final Chapter Prologue, was released in 2017. The collection was met to generally positive reviews. Kingdom Hearts Final Mix, in addition to being created from the ground up due to lost assets from the original game, had the most adjustments made to its gameplay, including adding Reaction Commands first introduced in Kingdom Hearts II and allowing the camera to be moved with the right thumb stick. Ideas for a remastered collection of Kingdom Hearts games were first revealed in August 2011, with the collection formally announced in September 2012. Additionally, the collection features a cinematic remake of Kingdom Hearts 358/2 Days, including high-definition cutscenes from the original game plus new scenes the 358/2 Days cinematic also has Trophy support. Kingdom Hearts HD 1.5 Remix includes both Kingdom Hearts Final Mix and Re:Chain of Memories in high-definition and with Trophy support. It was revealed in September 2012 and released in Japan in March 2013, and North America, Australia and Europe in September 2013. Kingdom Hearts HD 1.5 Remix is a HD remastered collection of the Kingdom Hearts series, developed by Square Enix originally for the PlayStation 3.

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