After defeating Kraid in his lair, you can get Super Missiles earlier than intended, by storing a Speed Boost and completing this simple triple singular-wall-jump.
In this particular run, this was my first time in Norfair/Crateria as I go straight to Kriad and clear it without Power-Grip.
In my 100% runs, I pick this Super-Missile expansion in my clean-up route and not at the time shown.

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