Celeste - 8B with BounceHelper
EDIT : the room at 1:54 has bounce bumpers disabled. I forgot to say it in the video
This is by far the level with the most impossible rooms (4, + 1 TAS-only room), which made it extremely frustrating to play. But it does have its moments. ITC-5 (1:00) is in the top 5 hardest rooms of the challenge and was fun to figure out. And the whole sequence HB-2-3-4 sequence (3:27) was one of my favourite ones so far.
HB-3 is impossible in hot mode but is pretty easy in ice mode, so you have to skip the core switch at the end of HB-2 in order to smuggle the ice mode. Except, doing so means you also have to clear HB-4 in ice mode, which is much harder than normal! I spent like 5 minutes trying to figure out HB-4 until I thought about the kevin-liftboosted wallbounce.
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