What is the most difficult level of Mario?

Question

It's safe to say that the most difficult level in the history of Super Mario Bros. was created by Go Seigen. He's done it after 450 hours of attempts. [ Jun 28, 2018)

Hagrid P Hazard · Accepted Answer

It's safe to say that the most difficult level in the history of Super Mario Bros. was created by Go Seigen. He's done it after 450 hours of attempts. [ Jun 28, 2018)

What is the most difficult level of Mario?

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