Sonic Adventure AutoDemo

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Sonic Adventure AutoDemo

System(s): Sega Dreamcast
Developer: Sonic Team
Genre: Action

Sonic Adventure AutoDemo is a Sega Dreamcast disc demonstrating the then-upcoming Sonic Adventure. It was released in small quantities, presumably for Japanese retailers and events to help promote the game - it was never released commercially, nor was it seen outside of Japan.

Sonic Adventure AutoDemo cycles through various in-game cutscenes (with their Japanese dubs) on a loop. It is not playable, but much like the final version of the game, the cutscenes are rendered in real time by the Dreamcast hardware. The disc has an internal build date of 1998-10-16, putting it roughly 55 days after Sonic Adventure's unveiling at the Tokyo International Forum (1998-08-22) and roughly 49 days before the build date of the game's first release in Japan (1998-12-10). The disc was dumped and released to the general public on 2013-05-21.

With the aid of hacking, it is possible to break the cycle of cutscenes in Sonic Adventure AutoDemo and access a fully-fledged prototype version of Sonic Adventure. Though much of the game is complete, there is a multitude of differences to the final version as well as left-over content from previous builds.