Area Room Category Name Description Difficulty Video
Norfair Crumble Shaft All Crumble Shaft rando item check Show Beginner Video
Hold an angle button through the door transition, while letting go of the dpad, and you will stop on a dime on the solid block next to the door. This will allow you to check the item location in randomizer without falling down.

Just be careful about the Dessgeega when going back in the previous room, since suitless they do 80 damage.
Norfair Crumble Shaft 100% Crumble Shaft missiles (optimal) Show Advanced Video
Fire a shot as you crest the third small hill, and release dash at the same time. This will open the door with enough time that you can run through. Start holding another shot before you hit the door, and release shot during the door transition. Once the next room loads, the shot should fire automatically, and you can jump to the other side.

The window on this jump is very small before you hit the crumble blocks, so you'll need to be precise. If the second Dessgeega jumps low, you'll need to fire the shot while Samus is inside its hitbox, where you can fire it earlier if the Dessgeega jumps high.
Norfair Crumble Shaft 100% Crumble Shaft missiles (intermediate) Show Intermediate Video
In the beginner strategy, the shinespark crash animation does cost time, so it would be faster to Space Jump across the room, as long as you're confident in not falling down.

One thing to watch out for is that the missile pack takes about 10 frames to spawn after the shot block gets destroyed, so in order for Samus' hitbox to touch the missile pack without falling past it, you will generally need to fire your shot at the peak of a jump, or while rising.
Norfair Crumble Shaft 100% Crumble Shaft missiles (beginner) Show Beginner Video
This strat uses a shinespark to reach the missile location.

You can attempt a 2-tap short charge, and if you run into one of the enemies you can continue holding Dash and Left, and use your i-frames to get through the rest of the enemies. Then charge the shinespark, open the door, and spark through. After you crash against the wall, hold Left and Angle Down and fire a shot, and you'll pick up the item.