Uploaded January 2021 | Updated September 2026, 2 weeks ago

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The Sonic the Hedgehog prototype is an early build of Sonic's debut game, and extremely incomplete. Many stages cannot be completed due to the lack of signposts and bosses; some (like Clock Work Zone Act 3 and Final Zone) haven't been started at all, or are obvious placeholder designs (like the Special Stage).
Source TCRF.
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