This is an incredibly well-done replica of the Parallax Demo that Sega shown off at the 1990 Tokyo Toy Show, created by Laffy Taffy.
This is NOT a real prototype. https://www.youtube.com/watch?v=MglYZarXobk
At present, MDTravis has 532,646 views spread across 281 videos for Sonic the Hedgehog, and roughly 2 days worth of Sonic the Hedgehog videos were uploaded to his channel. This is 38.64% of the total watchable video on MDTravis's YouTube channel.