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|
Dated September 16, 2006. A shortened version of the TGS 2006 demo released on Xbox Live Arcade on September 27. Some of what's playable is a little more polished than the final, but under the hood the game's far more incomplete.
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.