For a game that is so notoriously difficult, it's disappointing to see how much of its difficulty stems in pseudo-difficulty: pick-a-path, find this hidden block, guess what the right decision is before the screen scrolls too far... once you know the layout of these levels, it's really not too hard, and is just an awkward experimental version of SMB1.
I really liked World 9, so I'd love to play the four bonus worlds, but I seriously can't be bothered beating this thing eight times in a row. So it'll likely stay as is.

I'm glad we got Doki Doki Panic instead of this in the West.