Question for experts: What is the ranking of the 10 most difficult puzzles?
I think there's really no standard on what is "difficult" yet.
As such, I think there's really no top 10 difficult list in general.
However, I believe each and everyone can give their own list of "top 10 most difficult puzzles".
I am lazy, I don't have a top 10 most difficult list readily available. When I come up with one, I will post it here.