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

7 Sonic The Hedgehog Prototypes You Were Never Meant To Play

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

7 Sonic The Hedgehog Prototypes You Were Never Meant To Play

Rare Sonic the Hedgehog prototypes unveiled for the first time - Tails' Channel

Play SEGA 32X Knuckles' Chaotix (Feb 2, 1995 prototype) Online in your browser

Community – The Sonic Stadium

Sonic The Hedgeblog

Sonic the Hedgehog 3 (prototype; 1993-11-03)/Comparisons - Sonic Retro

Sonic X Deleted Scene: Knuckles And Tails Argue About The Master Emerald

Sonic The Hedgeblog

Knuckles the Echidna, Sonic X Wikia

Sonic The Hedgeblog on X: In early prototype versions of Knuckles Chaotix, Metal Sonic's reveal used a much higher r… / X

Sonic The Hedgeblog X પર: CVG Magazine Issue #174 – Article about the Arcade version of Sonic The Fighters. Very early models used here, based on the 'Fighting Vipers' prototype. /