In the rare case I do use the difficulty slider, anything below demon receives its star value and anything above is just whatever I feel like. I think a slider like the one on this site is kinda stupid tho since people have such wide inconsistencies in the way they use it. This results in the average difficulty score a level is given being just about meaningless. ig a similar argument can be made about level quality scores too but those seem to be a bit more consistent except for a few outliers.