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Sonic the Hedgehog 2 (Simon Wai prototype)

This particular prototype is named after Simon Wai, who found the ROM on a Chinese website and subsequently brought it to the attention of the Western Sonic the Hedgehog fan community. It was the first prototype to be found of Sonic 2, and for many years was simply referred to as "Sonic 2 Beta".

for more info on this prototype made SonicTeam, http://info.sonicretro.org/Sonic_the_Hedgehog_2_%28Simon_Wai_prototype%29