Sonic The Hedgehog 3 prototype discovered and put online for all to enjoy

A piece of Sonic the Hedgehog history has made its way online after more than 25 years.

The extraordinary fan-game roots of Sonic Mania - GameCrash

Steam Workshop::Sonic 3 Prototype

Sonic the Hedgehog: Triple Trouble 16-Bit (Video Game) - TV Tropes

Early Sonic 3 prototype found, features major differences to the final game

7 Sonic The Hedgehog Prototypes You Were Never Meant To Play

Rare Sonic the Hedgehog 3 prototype found, features cut zones, alternate music, different art, cut gameplay mechanics, and more : r/Games

Inside Sonic The Hedgehog 2

Sonic Jam - Wikipedia

A brief history of Sonic The Hedgehog on PC