sentences:  The game centers on the journeys of Terra, Aqua and Ventus, characters briefly featured in "Kingdom Hearts II" in their quest to locate the missing Master Xehanort, and protect the worlds from creatures known as the Unversed.The player has access to the three characters' different scenarios when playing.Development of the game began in June 2005 with parts of the game "Kingdom Hearts II Final Mix" meant to bring clues of "Birth by Sleep".