"Back 2 Back" is a music track from Sonic Rush, which plays during the second zone, Water Palace. As with the other stage tracks in Sonic Rush, there are two versions of "Back 2 Back", the "Sonic Mix" played in Sonic's acts and the "Blazy Mix" played in Blaze's acts. This song has been recycled multiple times in the Sonic franchise, first as an unlockable song for Casino Park in Sonic & Sega All-Stars Racing. Water Palace returns in the Nintendo 3DS version of Sonic Generations, and thus, so does "Back 2 Back". The Classic "remix" is infamously a straight rip of the Digital Remakin' version from Rush's soundtrack, Original Groove Rush, whilst the Modern remix is an electronic rock mix arranged by Cash Cash.