Some challenges allow for multiple in-game difficulty settings, so that wouldn't quite work. Perhaps it will be easier than we think to assess the difficulty of the challenge by looking at what it is or by trying it out. I would at least suggest the challenges be attempted before any are labeled. I also think the labels should probably not be the same as the in-game difficulties, just to avoid any possible confusion. They could be something like: Very Easy Easy Average Difficult Very Difficult Okay, I know the first two are the same as in-game, but I don't know what else to put for "easy." Although, perhaps we shouldn't even have "very easy" and "easy" challenges. They are supposed to be challenges after all.