Guitar Hero On Tour: Decades (ギターヒーローオンツアーディケイズ) is a music rhythm game developed by Vicarious Visions and published by Activision for the Nintendo DS handheld game console. Released in Europe in 2008, the game is a spin-off of the Guitar Hero series and features a peripheral device called the Guitar Grip which is used to simulate playing a guitar. The game features 25 classic rock songs from the 1950s to 2000s and a career mode in which players progress through four decades of rock music. Players can also compete against each other in the game's multiplayer mode. The game also supports the Nintendo Wi-Fi Connection, allowing players to compete against each other online. Guitar Hero On Tour: Decades provides a unique experience for both veteran and casual gamers alike, combining the classic Guitar Hero gameplay with the portability and convenience of the Nintendo DS.