leftventricle

-First off, yes this is a cheated run. The player used Action Replay to have moonjump.
-Second, makes heavy use of secret worlds. Don't like it, don't watch it, and definitely don't leave a bunch of dumbass comments about cheating. And to stave off a potential wave of "wtf are secret worlds" comments, there's a bit of history of the term in the Metroid game series, so the easiest way to describe it is the area outside of the standard boundaries of the game world.
-Third, I am not the player, just the uploader. I don't remember where I got it from or who the player is, so credit to whoever made this in the first place.