Guitar Hero World Tour (initially referred to as Guitar Hero IV) is a music video game developed by Neversoft and published by RedOctane and Activision. It is the fourth main entry 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 Apple Macintosh has also been announced for a release in Q3 2009.
While the game continues to feature the use of a guitar-shaped controller to simulate the playing of rock music, Guitar Hero World Tour is the first game in the Guitar Hero series to feature drum and microphone controllers for percussion and vocal parts, similar in manner to the competing Rock Band series of games. The game allows users to create new songs through the "Music Studio" mode, which can then be uploaded and shared through a service known as "GHTunes".
World Tour received generally positive reviews with critics responding positively to the quality of the instrument controllers, the customization abilities, and improvements in the game's difficulty compared with the previous Guitar Hero III: Legends of Rock. Some reviewers have commented on issues with poorly laid-out note tracks, the limited Career modes, and the difficulty of the music creation tool and the poor quality of the resulting songs.