Hello! About this supposed "Sonic 1 proto 1990", I found on Youtube, a video in which this prototype appears with new pics of Green Hill in an edition of japanese magazine"BEEP! Megadrive"(August 1990). Let's Browse: BEEP! Mega Drive Magazine Aug 1990 http://www.youtube.com/watch?v=-1kPsP0kxzA The images of "Sonic 1 proto" appears from 8min 25s.