Both RedOctane and Harmonix experienced changes in 2006. RedOctane was bought by Activision in June—who spent US$100 million to acquire the Guitar Hero franchise—while it was announced in October that Harmonix would be purchased by MTV Networks. As a result of the two purchases, Harmonix would no longer develop future games in the Guitar Hero series. Instead, that responsibility would go toNeversoft, a subsidiary of Activision known for developing the Tony Hawk's series of skateboarding games. Neversoft was chosen to helm theGuitar Hero series after Neversoft founder, Joel Jewett, admitted to the RedOctane founders, Kai and Charles Huang, that his development team for Tony Hawk's Project 8 went to work on weekends just to play Guitar Hero. Activision CEO Bobby Kotick believed that Neversoft would help them bring great games to the series, but on reflection, state that had Activision explored Harmonix further as a continued developer for the series, things "may have turned out differently". In addition, Activision began seeking other markets for the game; a Nintendo DSversion of the series was developed by Vicarious Visions, while a Guitar Hero Mobile series was created for mobile phones. The company also began considering the expansion of the series to band-specific titles with Guitar Hero: Aerosmith. Later, in November 2008, Activision acquiredBudcat Creations, another development studio that had helped with the PlayStation 2 versions of Guitar Hero III and World Tour, announcing that they will be helping to develop another game in the Guitar Hero series.