From Wikipedia: Wario Land: Super Mario Land 3, known in Japan as Super Mario Land 3: Wario Land (スーパーマリオランド3 ワリオランド Sūpā Mario Rando Surī Wario Rando), is a platforming video game developed by Nintendo on the Game Boy in 1994. It is the first video game to feature Wario as both a playable character and the main character, as well as the first appearance of Captain Syrup and her Brown Sugar Pirates, recurring villains in the Wario Land series. Despite the Super Mario Land 3 subtitle, Mario has very little to do with this installment in the series, but it is still considered a part of the Super Mario series of games.