Sonic the Hedgehog 2 (Genesis) - The Cutting Room Floor

Virtual Spotlight: 3D Sonic the Hedgehog 2 is Still Peak Sega

Sonic the Hedgehog 2 (Sep 14, 1992 prototype) - Hidden Palace

Prerelease:Sonic the Hedgehog 2 (Genesis) - The Cutting Room Floor

Sonic 1 (MD) Prototype - What Was Left on the Cutting Room Floor? (A Friend Reacts)

Sonic Mania: Project Discovery [Sonic Mania] [Works In Progress]

Review: 3D Sonic the Hedgehog 2

Proto:Sonic the Hedgehog (Genesis) - The Cutting Room Floor

Best Sonic games ranked - the games to play before Sonic Superstars

Sonic the Hedgehog 2 (8-bit)/Beta elements, Sonic Wiki Zone

𝚂𝙾𝙽𝙸𝙲 - 𝚃𝙷𝙴 𝙽𝙸𝙶𝙷𝚃𝙼𝙰𝚁𝙴 𝚆𝙾𝚁𝙻𝙳 (@Sonic_in_NMW) / X

Liberado el prototipo de Sonic the Hedgehog para Sega Mega Drive / Genesis – Otakufreaks

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

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

Press The Buttons: Go Back In Time With Sonic CD For Nintendo DS