Tony Hawk's Underground 2 is the sixth installment in Neversoft's Tony Hawk's series and is the sequel to Tony Hawk's Underground. Underground 2 was first released on October 4, 2004 in the US for the PlayStation 2, Xbox, GameCube, Microsoft Windows and Game Boy Advance platforms. The game is partly based on season 2 of Viva La Bam, although there are many references to Jackass.