"Kingdom Hearts" is the first game of the series for the PlayStation 2. It was released in Japan on March 28, 2002 and in North America on September 17, 2002. In the game, Sora, Riku and Kairi end up going separate ways, when their island is invaded by Heartless (monsters who steal people's hearts). Sora wields a Keyblade, teams up Donald Duck and Goofy, and travel around the universe for each worlds, including "Alice in Wonderland", "The Little Mermaid" and "The Nightmare Before Christmas". Sora learns that Riku is possessed by Ansem, the creator of Heartless, who unsuccessfully kidnap seven Princesses of Heart (including Kairi), in order to reveal the Keyhole. While Kairi stays at Destiny Islands, Riku and Mickey Mouse are trapped in the Realm of Darkness, and Sora seals the door to prevent Ansem from using it. "Kingdom Hearts Final Mix" is a reissue of the game that was released only in Japan on December 26, 2002. It has more features than the original, including a battle with Roxas.