Sonic Heroes (E3 2003 Prototype)

The GameCube E3 Prototype of Sonic Heroes was recovered in 2014 and dumped in 2016 via a collaboration between the English site Sonic Retro and the Spanish site Sonic Paradise. A Xbox version was also found.

Sound Differences
Due to being a demo, only a few music tracks are included in this build. Interestingly, Sea Gate's music is present, and is given the filename "SNG_STG02.ADX", suggesting it was originally for Ocean Palace.