Guitar Hero On Tour: Decades (ギターヒーローオンツアーディケイズ, Gitaa Hiirou On Tsuaa Dikeizu) is a Nintendo DS game developed by Vicarious Visions and published by Activision. It is the third game in the Guitar Hero series, and the first portable version. The game features a setlist of songs from the 1970s, 1980s and 1990s, and allows players to use the Nintendo DS stylus to strum the guitar strings. Players can also create their own characters and join online battles with other players. Additionally, the game has a 'jam session' mode, which allows up to four players to play together in the same game. In this mode, each player has their own part to play, and the game encourages cooperative play. The game also features an enhanced career mode, with additional challenges and rewards. With its wide variety of songs and features, Guitar Hero On Tour: Decades is sure to provide hours of fun for music fans of all ages.