Green Day: Rock Band is the second major release in the Rock Band series designed around a specific band, in this case the American punk rock group from California. The game features 44 tracks (equaling 47 songs since some are arranged in medleys), including the entirety of the band's best-selling albums Dookie , American Idiot and 21st Century Breakdown (minus six tracks released as DLC for earlier Rock Band games), and selected tracks from Insomniac , Nimrod and Wanted .
The gameplay remains the same as in other games of the series: players use their instrument controllers to play guitar, bass and drum parts and sing vocal parts, matching notes on the screen in rhythm with the music. Vocal harmonies are also featured, allowing three players to sing certain parts together. The game offers Quick Play and Career modes. In Quick Play, all included songs can be played from the start, while Career mode moves through several setlists, unlocking more songs along the way.
The game features a Score Duel mode, where multiplayer duels against players playing the same instrument part on the same song. The game was released for the Wii console on 11 June 2010 and is available in the Action & Adventure genre.