User blog comment:JoyIF/Subjective Categories/@comment-16894369-20140602025829

Personally I think only Hard levels to earn three stars would barely deserve a category, and that is with Very hard/Insanely hard levels merged into that category, and yet it is still subjective.

As for unstable Moon Scale, it might be okay, because I ensured that only Moon Scale with less 3-6-8 qualifies it, and it's easy to observe (Odus concerns about it with a simple 3-match).