The physics are odd if you're used to the MegaDrive games but the 8-bit version of Sonic the Hedgehog is surprisingly good. The more platforming focused levels made for the weaker hardware are surprisingly fun and the game while more challenging than it's 16-bit counterpart has a mostly steady difficulty curve. That said the water physics in Labyrinth Zone feel pretty bad and really hurt the game for a few levels, and putting an autoscroller in a Sonic game for Bridge Zone Act 2 was a crime. The 8-bit soundtrack is fun and bouncy.