Square Enix released a gameplay video of Kingdom Hearts Unchained at E3 2015. The mobile game is a port of the Japanese-only browser game Kingdom Hearts X. The story is connected to the Keyblade War mentioned in the new footage of Kingdom Heats 3.
The gameplay features Final Fantasy characters alongside Donald Duck, Mickey Mouse, Hercules, and many others. Kingdom Hearts Unchained will appear on iOS and Android, but no release date has been announced.