Proto:Sonic Adventure (Dreamcast)/Trial Version for E3

The Trial Version for E3 is US build of Sonic Adventure created to exhibit the game's North American localization progress at E3 1999.

With a burn date of June 8, 1999 (six months after the Japanese version's release), this build predates the official US release by three months. This prototype was dumped and released by Sonic Retro member drx on August 31, 2008.

Early Knuckles Voice
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Knuckles has a more gruff and deep tone of voice at this point. All his lines would be redone by the same actor in time for the final. Details are explained in-depth on the video in the form of annotations, beginning at 4:39.

The latter half of this video demonstrates Knuckles' early voice samples that exist inside the disc, which were ripped by Sonic Retro forum user "evilhamwizard".