Guitar Hero World Tour (initially referred to as Guitar Hero IV or Guitar Hero IV: World Tour) is a music rhythm video game developed by Neversoft and published by Activision. It is the fourth main installment in the "Guitar Hero" series. The game was launched in North America in October 2008 for the PlayStation 2, PlayStation 3, Wii, and Xbox 360 consoles, and a month later for Europe and Australia. A version of "World Tour" for Microsoft Windows and Mac OS X was later released by Aspyr.