Overall, what is the worst challenge stage in entire game (stages with the interval of 5)

I don’t think it’s shocking for me to say that it’s Tea-her time personally, this entire stage is such an annoying mesh of needing to meatshield and dying if you do meat shield because of Chemist.
Another runner up is probably Role Reversal, I didn’t like this stage in the slightest ngl but another contender is Heavy rushdown for obvious reasons.