...into the far right green room in Norfair. The one next to the really long blue column. I've tried all different ways, but can't seem to find out how.
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That area is the key to a major sequence break: Ridley before Kraid. There are no items in there, so you never actually have to enter, but you can save yourself a lot of time in Norfair if you do. (This is especially useful in a low-percent game, where you may be planning to skip the Wave Beam, Screw Attack, or High Jump Boots -- this trick gets you past them all, and without Speed Booster, to boot.)