Sonic the Hedgehog CD (Sega CD) - The Cutting Room Floor

Editing Sonic the Hedgehog 2006 (lost build of Tokyo Toy Show tech demo of multiplatform platformer; 2005) - The Lost Media Wiki

Sonic the Hedgehog CD (Dec 4, 1992 prototype) - Hidden Palace

Interview with the developers of Sonic Frontiers. They hope you will enjoy the serious story with a sense of sadness and the high-speed, profound battles that make full use of various actions [

Sonic the Hedgehog CD (Aug 1, 1993 prototype) - Hidden Palace

Mega Drive platformer Ristar turns 20

Sonic Championship - The Cutting Room Floor

The Cut Content Of: Sonic The Hedgehog - TCCO

Sonic' Creator Alludes to Michael Jackson Working on 'Sonic 3' Music

Sonic Classics - The Cutting Room Floor

Sonic The Hedgehog: The Movie AKA Sonic OVA (3rd Anniversary Review) – The Cutting Room Floor

Sonic the Hedgehog CD (Sega CD)/Special Stage - The Cutting Room Floor

Sega Multimedia Studio: Sega CD Demo (May 29, 1992 prototype) - Hidden Palace

Sonic CD's Mysterious Cut R2 Level Discussion - Post Origins Edition, Page 32