Ive seen in a lot of top runs of 6-1 that they jump into the wall in a specific spot and they clip onto the roof. Is there a way to reliably set this up and is there a video or description someone can give me to help me get the hang of it? I have looked for a video and watched the runs but i cant figure out a setup for my sub minute run. It's the last level i need to sub minute before layer 3 and i can't get the skull before 30 seconds so it's eating up a lot of time. Thanks all

stand right up against the wall and look straight ahead, jump and a little bit before max height you shoot a frozen rocket, then you back up and dive against the wall, that setup usually works for me

Sorry i should've specified more. Im talking about the clip immediately outside of the spawn. The clip after getting the skull and above the door frame i've already gotten down. Getting to there is the issue so this clip would save me a ton of time leaving only the boss room.

That 6-1 clip was patched, you'll have to downpatch if you want to do it in a run.

the clip right out of spawn isnt patched tho i would not recommend going for it in a run due to how challenging it is