I always thought Zone 3 was one of the easier stages on S3K myself, although the boss at the end is tricky. There are several extra lives and tons of rings. Back to the remix, I found that the BGM to Zone 3-1 was a very versitile theme and it has been made into a techno remix(SonikElektronik), an elevaor remix (Pure Black, or Marbles and Cream) then this one. As far as the association to the original track to Zone 3-1, I only had to hear the first second to know exactly what BGM it came from. As a matter of fact, I could've told right off the bat if it was either Act 1 or Act 2. Speaking of which, I don't know if it's been done or may be done in the future, but I wonder if someone will do a remix for Zone 3-2, because the ones I have heard so far are all Act 1. It probally wouldn't be that much diffeent since the songs are rather close in melody.