Name: Sonic II (Early Prototype)
Platform: Sega Genesis / Mega Drive
Region: USA
Media: Cartridge
Controller: Gamepad
Genre: Platformer
Gametype: Prototype
Release Year: Unreleased
Developer: SEGA
Publisher: SEGA
Players: 1
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Best Hidden Palace release ever. Beats anything, easily. It's VERY early, based on Sonic 1 and whatnot. Enjoy.

http://www.hidden-palace.org/?releases/34