Is there a reason why Sega/Sonic Team didn't share the S3&K zone sketches in Sonic Origins or any other material like the anniversary artbooks? The only place where I remember seeing those sketches other than the 1994 MTV special was the 20th Anniversary Expo they did at Joypolis, so they still have it with them. I wanted to see those in decent quality for so long, even if most of them were just recolored S2 concept art. They do have some original drawings like the Sky Sanctuary (?) in the top-left corner. Apparently someone did scanned that art (alongside the Winter Zone sketch) at the time and shared it on the Rare Art thread here on Retro in 2012 but the images have expired since then. There was also a video in French showing the displays at the Joypolis event but the channel owner privated it in 2014/15.