sentences:  It is the first tennis-based game starring Mario since "Mario's Tennis", and the second game developed by Camelot on a Nintendo system.The game is known for being the introduction of Luigi's evil doppelgänger, Waluigi, and the re-introduction of Princess Daisy and Birdo.A Game Boy Color version, also developed by Camelot and Nintendo, was published under the same title in Western regions and as Mario Tennis GB in Japan.