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.

[3] 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.

According to co-director Tai Yasue, approximately 80% of the original audio was remixed, as well as additional orchestral elements added to the songs.

[2] Birth by Sleep is a prequel to the original Kingdom Hearts, taking place ten years before the title's events.

The game centers on the journeys of Terra, Aqua and Ventus, characters briefly featured in Kingdom Hearts II, and their quest to both locate the missing Master Xehanort and protect the worlds from creatures known as the Unversed.

[2] The title is set after Kingdom Hearts II and follows the discovery of Jiminy Cricket's journal, which chronicles Sora's fight against the Heartless and Organization XIII, which is found to have two secret messages written by persons unknown.

This leads king Mickey and his friends to make a digital Sora to enter and repair the journal so that the meaning of the hidden messages can be deciphered.

The first, titled Kingdom Hearts Starter Pack: HD 1.5 + 2.5 Remix, features the previously mentioned material and limited edition casing, while the second, Kingdom Hearts Collector's Pack: HD 1.5 + 2.5 Remix features limited edition casing, a promo soundtrack and a booklet with art from the series in addition to the previous material.

[12] A collector's edition for North America and Europe was also released, featuring both HD collections, a steelbook case, art book, Disney Kingdom Hearts pin and a Heartless plush doll.

[23] IGN propounded the same points, noting the improved music, graphics, and "high-level challenges", but criticized the aging controls from Kingdom Hearts II and the camera system in Birth by Sleep.

[24] In the credits of HD 2.5 Remix, clips of Kingdom Hearts 3D: Dream Drop Distance were shown as well as the inclusion of a secret ending related to the game, hinting at a possible additional collection.