Kingdom Hearts is a fictional parallel universe in which there are different characters, places and things that exist. This role all series voiced by the human voice, and the role from the Final Fantasy series also appear in the game, and with the players and other characters make contact. The story revolves around the main character Sora also seeking contact with his friends journey or Final Fantasy role. This game series includes seven games, but these games are also using different gaming platforms. Game series expansion is still in progress. Most of the games in the series have gained great success, support and profit. Until August 2010, the Kingdom Hearts series has sold more than 14 million games, of which three million games sold in Japan, while there are 5.6 million games sold in North America.