sentences:  A new boss known only as the Unknown appears in the overseas versions, as well as a new gameplay element called "Crown Stickers", which act much the same way as the Puzzle Pieces from "Kingdom Hearts II Final Mix".The game also has a notable voice-acting cast of returning members such as Jesse McCartney and James Woods, as well as numerous new actors such as Willa Holland, Jason Dohring, Leonard Nimoy, and Mark Hamill.An Ultimania guidebook of the game was released on March 25, 2010.