Also, not to get off topic in my own topic, but I'd just like to go on and say how impressive Labyrinth Zone is on the SMS. I'd say it's technically one of the most impressive levels on the entire system. For an 8-bit game, that level is an achievement. Nothing in Sonic 2 SMS comes close to being that impressive. <!--quoteo(post=445906:date=Apr 21 2010, 02:48 PM:name=ICEknight)--><div class='quotetop'>QUOTE (ICEknight @ Apr 21 2010, 02:48 PM) <a href="index.php?act=findpost&pid=445906"></a></div><div class='quotemain'><!--quotec-->You must also keep in mind that the concept art for Sonic 1 MD looks nothing like any SMS exclusive level so, at most, some levels might have been based on not-so-early concepts.<!--QuoteEnd--></div><!--QuoteEEnd--> By concept art you mean actual drawings? Because those don't really look like anything from Sonic 1 MD either.