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Proto:Sonic the Hedgehog (Genesis) - The Cutting Room Floor
Sonic Origins cheat codes for level select, debug mode and Super Sonic
Sonic 1 Special Zone (1991) : r/fakehistoryporn
Proto:Sonic the Hedgehog (Genesis)/Green Hill Zone - The Cutting Room Floor
Scrap Brain Zone - Sonic Wiki - Neoseeker
New Sonic the Hedgehog (1991) prototype uncovered by preservation groups - Tails' Channel
Stream Sonic 1 Final Boss Orchestra DLC Remix(with Joshua Taipale) by marvinvalentin
Sonic the Hedgehog (1991 video game) - Wikipedia
Sonic Superstars hands on: Sega's new Sonic game is a glossy spin - Polygon
