Proto:Sonic the Hedgehog 3 - The Cutting Room Floor

Sonic the Hedgehog 2 Autodemo (Prototype) : Free Borrow & Streaming : Internet Archive

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

Proto:Sonic Heroes/E3 2003 prototype - The Cutting Room Floor

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

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

Stealth confirms the replaced tracks in Sonic Origins are the Prototype tracks completed by Jun Senoue! : r/SonicTheHedgehog

Descoberta versão de Sonic 3 nunca lançada

Sonic The Hedghog 2: Beta Analysis - Unseen64

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