Sonic the Hedgehog 2 (Simon Wai prototype) - Sonic Retro

Sonic the Hedgehog 2 (Simon Wai prototype), Sonic Wiki Zone

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Sonic the Hedgehog 2 (Simon Wai prototype) - Sonic Retro

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Sonic the Hedgehog 2 (World) (Beta) (Simon Wai) [Hack by Esrael v0.23] (~Sonic 2 Delta) ROM < Genesis ROMs

Proto:Sonic the Hedgehog 2 (Genesis)/Simon Wai Prototype - The Cutting Room Floor

Genesis Games online Page 35