Shows some early Sonic sprites before he was changed.
Another screenshot of early Green Hill.
This screenshot shows an early version of Sonic's sprites and an early object layout for Green Hill Zone.
Another early screenshot of Sonic's sprites.
This shows Sonic doing his famous jumping animation at the end of the act.
This shows an early layout of Act 2.
More of early Act 2's layout.
Shows an early background which was replaced by a more accurate one.
This shows an even earlier version of Act 3 which is clear thanks to it still using Act's 1 and 2's assets.