Proto:Sonic the Hedgehog (2006)
This page details one or more prototype versions of Sonic the Hedgehog (2006).
Xbox Live Arcade Demo
| Xbox Live Arcade Demo|
Built on September 16th and released on September 27th, what's playable here is a lot more polished than the final.
A heavily corrupted review version of the game was found in 2019 and is currently being restored; all of the recovered data seem to be identical barring duplicate stage files and the executable.