Kingdom Hearts (キングダム ハーツ Kingudamu Hātsu) is a series of action role-playing games developed and published by Square Enix (originally by Square). It is a collaboration between Square Enix and Disney Interactive Studios, and is under the direction of Tetsuya Nomura, a longtime Square Enix character designer. Kingdom Hearts is a crossover of various Disney settings based in a universe made specifically for the series. Characters from Square Enix's Final Fantasy series and The World Ends with You make appearances and interact with the player and the Disney characters. The series centers on the main character Sora's search for his friends and his encounters with Disney, Final Fantasy and The World Ends With You characters on their worlds.
The series currently consists of seven games across multiple video game consoles, and future titles are planned. Most of the games in the series have been both critically acclaimed and commercially successful, though each title has seen varying levels of success. As of March 2011, the Kingdom Hearts series has sold over 17 million copies worldwide. A wide variety of related merchandise has been released along with the games, including soundtracks, figurines, companion books, novels, and manga series.