This is a sub-page of Proto:Sonic Adventure (Dreamcast)/AutoDemo.
Emerald CoastRather empty compared to the final game, even lacking the killer whale section.
Windy ValleyCompletely disparate to the final version, and the same one shown in early showcases of the game.
Twinkle ParkThe old Act 1 object layout is still here, although the unique objects aren't, and is very empty.
Speed HighwayProbably Sonic's most functional stage in the prototype, as well as having the old Act 3 design.
Red MountainOne of the more complete stages in this build, complete with Tokyo Game Show tutorials! Be prepared to fight the camera as Sonic, though.
Sky DeckConsiderably far along compared to other stages, and can be completed as Sonic.
IcecapIce crystals everywhere!
CasinopolisExtremely rough, with only basic modelling done, and nearly lacking all objects.
Final EggAbout in the same state as Emerald Coast.
BossesEither mostly finished or barely started.
Adventure FieldsEither boots the player out or just crashes, but still has some design leftovers from earlier builds.