Sonic The Hedgeblog on X: In early prototype versions of Knuckles

Sonic Origins: The Sonic & Knuckles Prototype Experience

Community – The Sonic Stadium

7 Sonic The Hedgehog Prototypes You Were Never Meant To Play

Sonic The Hedgeblog

7 Sonic The Hedgehog Prototypes You Were Never Meant To Play

Sonic & Knuckles (May 25th, 1994 Prototype) : Free Borrow & Streaming : Internet Archive

Sonic The Hedgeblog

Proto:Sonic the Hedgehog 2 (Genesis)/0524 Build - The Cutting Room Floor

Knuckles the Echidna (Pre-Super Genesis Wave), Sonic Wiki Zone

Knuckles' Chaotix prototypes -The 32X Database

Sonic The Hedgeblog

Revealed! - Epic Unused Sonic 3D Knuckles Bonus Stage Music Demo

Sonic The Hedgeblog

Knuckles struggles to land a punch on Sonic, Sonic vs. Knuckles

Sonic The Hedgeblog on X: An early trailer for 'Sonic Shuffle' shows early versions of the intro CG sequence. In this spot, Knuckles' chest and the stage image are different. /