Question: what is the hardest mario maker level?
Answer: It's safe to say that “Super Seigen's Magnum Opus” is the most difficult level in the history of Super Mario Bros. Go Seigen, a level designer, has been working for the past 10 months to just beat his own level on Super Mario Maker so he could put it on the internet. Now, after 450 hours of attempts, he's done it.