Sonic the Hedgehog (Prototype) - Hidden Palace

A prototype of Sonic the Hedgehog for the Sega Mega Drive.

Dreams Come True: Sonic 1 (MD) Prototype (Hidden Palace) : r/SonicTheHedgehog

Concepts and prototypes, THE Sonic the hedgehog Wiki

Alexander1987: Sonic 2 beta ( Delta ) with clocker woods, hidden palace, and sand zone, deleted stages from sonic team 1991.

Proto Palace Zone, Sonic Wiki Zone

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

Sonic the Hedgehog (Prototype) - Hidden Palace

Hidden Palace Zone (Sonic the Hedgehog 2), Sonic Wiki Zone

Secrets of Sonic Team=

Stream Hidden Palace Zone (Prototype Version) by Sonic's Music Collection

Genesis / 32X / SCD - Sonic the Hedgehog (Prototype) - Sparkling Zone - The Spriters Resource

How to Unlock the Hidden Palace Zone in Sonic Origins - Prima Games

Hidden Palace Zone in Sonic 2 Master System! by ThomasTheHedgehog888 on DeviantArt

Sonic the Hedgehog 2 (PROTOTYPES) LOST BITS Cut Content & Unused Zones [TetraBitGaming]

Sega Genesis / 32X - Sonic the Hedgehog (Prototype) - Labyrinth Zone - The Spriters Resource