A semi-late prototype of Sonic the Hedgehog 2! This one predates the recently rediscovered CENSOR prototype and was built after Simon Wai. This prototype is notable for being one of the very first known prototypes to feature the title cards and special stage. The special stage is only partially implemented, and the title cards display some interesting results! This prototype also confirms that "Dust Hill" was one of the earlier names for "Mystic Cave", and not a name for the "Desert" zone.
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