well... this was a cakewalk compared to 7e lul Celeste D-Sides, a series of custom maps created by Monika523. Download them here: gamebanana.com... Follow me on Twitch: twitch.tv/jasperliang
There was someone who uploaded a Chapter 3 L-side. It required things like several frame-perfect Ultras in a row and Feathering through 1-block wide passages and it was honestly kind of stupid.