On it

You want 18 different categories?

I guess not

After a couple months of deliberating, we've decided not to add 18 new categories.

maybe just add 1 player & 2 player NG & NG+ ?

So keep it as 4 main categories (Normal difficulty, No cheats, Ect)

Been speaking about a 2 player run with a friend hence why im asking :)

Added

i would be down with difficulty sub cats it will make the game more fun for people who have already played easy 5000 times but i dont think it would be nesisary for difficultys to be on 1p 2p and 3p categories since there not that active