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This romhack I would say falls under Hard Mode, and requires some knowledge of SMB1 physics to get through some traps and barriers. This is a fairly competent romhack and I didn't find myself struggling too hard, but there were times where the game gets a little buggy, and a couple of oversights that forces you to run out the clock to start over.

Also it seems like the author behind this romhack is very giving with powerups, but it actually adds to the fun rather than being detrimental to the experience.

World 2-2 - You can get stuck here if you take a certain bottom path that expects you to be small Mario, instead take the trampoline to get to the roof instead.

World 3-2 - Do not take the directional platform to the flag or you risk a bug

World 3-4 - The beginning requires you to do a very hard hop jump off a enemy and onto the other side, expect to die a lot on this one.

World 4-1 - There is a tricky jump with a trampoline where you must land on a Lakitu to get to the other side, sometimes this Lakitu doesn't spawn properly.

World 5-4 - Don't jump onto the last roof or else you'll be stuck forever.

World 6-1 - There is a tunnel where you need to be small Mario to proceed, dunking under as big Mario will not move the screen for some reason.