This video assumes you are familiar with this secret world and wallcrawling in general. For a more detailed tutorial which explains this, go here:
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I believe the the world record is here (it's milesSMB's in-progress run):
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This is not the fastest method of getting through each room, but this video covers the route that uses the ice beam doors in Furnace.
The most difficult part of this is not triggering the Chozo ghost fight in Hall of the Elders. All I can say is that you don't want to go too far into the room or touch the ice beam door. I get the best results when I slowly approach the door and only move while in mid-air. In this video, I show how to retry if you fail.
I've had the most success starting from right of the door and facing it (you can stand almost anywhere right of the door). Then I move forward until I'm just about at the door; going too far forward seems to trigger the fight. Then jump and move yourself right in mid-air. You are trying to wedge yourself into an invisible corner that will transition the map for you.
To get the tunnel to load while in Furnace, jump so that you press against the small bit of wall to the right of the ice door (facing toward the center of the room).
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