Sonic the Hedgehog 2 on the Master System is not at all like the Genesis version. Yes, it's a platformer as well, but the levels, bosses and almost everything else is completely different. This game also introduces vehicles, such as hanggliders and minecarts. Like the first Sonic on the Master System, it's a good game, but nowhere near as good as its console counterpart.
Drake is Mr Virtual Console, with more classic games rattling around his head than there are minutes in the day. CapnDrake
UPDATE: More sources step foward
Alternative approaches can keep the concept alive
56 degrees of separation
Perhaps a sign of things to come?
Will we ever see this classic in the west?
Controller Pak emulation seems to be the issue