Sorry, by harder I meant for the same number of faces. E.g. the article is about 5 60 sided dice, which was a breakthrough, but there are other known solution

Sorry, by harder I meant for the same number of faces. E.g. the article is about 5 60 sided dice, which was a breakthrough, but there are other known solution where all the dice are less than 60 sided, but they are unequally sized.