1' briefly appearing onscreen, followed by the game softlocking because no level data exists for this level slot. Trying to access it by modifying the current Zone/Act address will lead to 'ZONE ACT. Zone ID 06, which is used in the final game for the ending, hasn't been implemented yet.

Every Zone contains many differences in the layouts themselves. This disproves the long-held theory, based on the level select of the original 'REV00' US release (which also happens to match this build, different Zone names notwithstanding), that the level order was rearranged late in development.įinal Zone isn't available in the Level Select, and levels use their early names. In order: Green Hill Acts 1-3, Marble Acts 1-3, Sparkling Act 1, and Star Light Act 1. Normally, only eight stages are playable without the Level Select. According to drx, this build was originally sent to an unspecified UK video game magazine in early 1991 for their pre-release coverage.ĭownload Sonic the Hedgehog (Genesis Prototype) It wasn't until late 2020 that an individual by the name of Buckaroo found a cartridge containing this prototype, and released its contents through Hidden Palace (on New Year's Day) for gamers to enjoy. Along the way, there were also a few ROM hacks created as attempted guesses to what such a prototype would look and play like (including Sonic 1 Beta Hoax, and Sonic 1 Beta Remake). During the time before this build surfaced, prototypes of all the other 16-bit Sonic games were discovered, dumped, and shared with the public. Long considered a holy grail by the Sonic community, a Sonic 1 prototype was sought after for around two decades.

It also features a plethora of interesting content that was previously only seen in grainy magazine screenshots and raw gameplay footage, like the rolling checkered boulder in Green Hill Zone, the UFOs in Marble Zone, and Spring Yard Zone when it was still called 'Sparkling Zone'. This build reveals a game that was originally tuned more for traditional platforming and exploration rather than for speed, which would eventually become the hallmark of the Sonic series. 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). It depicts the game midway through development. A prototype of Sonic the Hedgehog was released by Hidden Palace at Midnight (GMT) on January 1, 2021.

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