New Sonic the Hedgehog (1991) prototype uncovered by preservation groups - Tails' Channel

A prototype of Sonic the Hedgehog (1991) was showcased by a video game preservation group in a New Year's Eve livestream.

21 Crazy Facts About Sonic and the Console War He Started - IGN

Sonic the Hedgehog 1 Prototype Livestream

Adventures of Sonic Episode Reviews Newbie's Perspective – CrystalMaiden77

Sonic the Hedgehog (1991) prototype discovered - The Independent Video Game Community

7 Sonic The Hedgehog Prototypes You Were Never Meant To Play

Sonic the Hedgehog - Main Characters / Characters - TV Tropes

Netflix reveals first look at Sonic Prime and new voice cast - Tails' Channel

21 Crazy Facts About Sonic and the Console War He Started - IGN

7 Sonic The Hedgehog Prototypes You Were Never Meant To Play

Sonic the Hedgehog (2006), Sonic Wiki Zone

Discussion) how would YOU Soft reboot the Sonic franchise? : r/SonicTheHedgehog

Sonic 3 Prototype With Lost Content Discovered - IGN

Sonic the Hedgehog (1991 video game) - Wikipedia

Sonic Mania – Sonic City Sonic the Hedgehog News, Media, & Community

Sonic the Hedgehog 2 (16-bit)/Development - Sonic Retro