Based on Square-Enix's popular action adventure game Kingdom Hearts II, the game returns as "director's cut" Final Mix+ edition in Japan. As it's common for top sellers in SE's franchise, this final cut edition contains a couple of new interesting features, targeted to fans of the series as well as those that haven't played the game before.

New features are:

English Voice Cast
New Explorable Areas as well as redesigned navigation maps
A new "Serious Mode" Difficulty
New scenes that were featured in the Japanese manga have been added to the game
New boss battles against the mysterious Orginization XIII
A fight that was a cutscene in the original is now playable
The censored parts of the game are no longer censored
All Difficulty modes have been tweaked up

The game also contains a second disc which features a remake of the GBA game: Kingdom Hearts: Chain of Memories, which is titled Kingdom Hearts: RE: Chain of memories. This Game's features are:

Rendered in fully 3D
KHII's Reaction commands system
New Cards and boss battles
New scenes and previous scenes are fully voiced in Japanese
Save data affects Kingdom Hearts II: Final Mix