Wario World is a platform video game developed by Treasure and published by Nintendo for the GameCube. Part of the Wario series, it was released in Europe, North America and Australia in 2003 and Japan in 2004. The game's plot centers on Wario and his quest to regain his treasure and his castle from the evil gem, Black Jewel. The game was fairly well received by reviewers, who praised the game's gameplay while criticizing its short length. The game has sold over 142,000 copies in Japan and over 256,000 copies in the United States. In 2004, the game was re-released as a Player's Choice title.