It seems interesting to add individual challenge level speedrun category for there are some unique challenges to paly.
It has been discussed on discord as a possibility, but I think there isn't much interest for running those.
Personally I think there's some potential, but only with specific challenges.
For instance, we already have decathlon% categories in category extensions, and those runs are a nice change in pace.
I feel like some other specific ones could be fun (maybe an all multi-level score challenges category), but I don't think it'd be good to add a category for every individual challenge.
@PoetryStud I agree, for example duel is very luck-based and there's no need to add these speedruns, more orange pegs/fewer balls/power plays(nights)/stylistic challenge(nights) can be good.