What's that? Sonic the Hedgehog was released? Stop clutching at gallery-filling straws? Well, I say nonsense to that. You see, these are the only known images of the 1990 prototype version of Sonic The Hedgehog shown at a Japanese toy show, as explained to me in person by Yuji Naka himself. Well, this totally counts as an unreleased game.
The reason is simple: As I explained in 2011, Yuji Naka wanted to include the prototype as a playable bonus in Sonic Mega Collection. But he couldn't find it because it's 'lost' (I say stolen), so it couldn't be released as per his intention. Therefore, it is an unreleased Sega game. There, bet you didn't think I'd be able to justify that one, eh? Anyway, it's so rare and so early, it even contains pre-badnik enemies, as these recently-unveiled screens from a contemporaneous Japanese gaming mag show. This is a massive piece of gaming history and one that I long to see for real.