Thanks to the Sonic The Hedgehog Archive on Twitter for making the image, it was a fun research project.

All images were sourced from Google Image search

00:00 Introduction
1:20 Layer 1
5:58 Layer 2
14:24 Layer 3
27:26 Layer 4
35:09 Layer 5
37:18 Conclusion

SA Website: http://www.sonicadventure.com/DRMCST...
SA Dev Website: http://sonic.sega.jp/sonicadv/index.html

Special thanks to _Rascal and Josh Kirbs from the Thaf Land World Resort Discord for their advice on the thumbnail.