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

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

Sonic Hacking Contest :: The SHC2021 Contest :: Sonic Vintage :: By ZachmanAwesomeness

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

Revisiting Simon Wai's Sonic 2 Beta

Sonic the Hedgehog 2 - Wikipedia

The Official Sega Solid Gold Guide: Sonic the Hedgehog 2 - Sega Retro

So about 5 years ago I came across and bought this Sonic 2 Prototype pirated cartridge at a car boot sale for £3. According to sonicretro.org it is highly sought after for

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

Sonic the Hedgehog Vintage - Full Playthrough [SHC 2022]

Finally - A Prototype For The Original Sonic the Hedgehog Has Been Found - Sonic Retro

Sonic the Hedgehog 2 (Simon Wai prototype)/Comparisons/Hidden Palace Zone - Sonic Retro

Sonic the Hedgehog - The Lost Worlds - Sonic Retro

Play Sonic: The Hedgehog 2 (Simon Wai Prototype), a game of Sonic