Known only as "drx," some mysterious mage has resurrected a Sonic the Hedgehog 2 prototype cart and promptly dumped it (for emulation). It's an early build of Sega's sequel that's more akin to the first game than to the final version of Sonic 2. Can you spot the differences?
It's been suggested that this prototype is the same alpha build that was featured in several episodes of Nick Arcade. Another early build, often referred to as Sonic 2 Beta, was stolen from a toy show in New York back in '92. The cart was pirated and sold as a final version in parts of Asia and Brazil, despite only featuring four semi-playable levels.