Golden Torizo code

The GT code is a glitch present in Super metroid, and is extremely unknown.

Executing the glitch
To perform this glitch, you must get to the entrance to the room in which you fight the Golden Torizo. Either door will work. When you begin the door transition, hold A,B,X and Y all at once. Doing so will award you with 700 Energy, 300 reserve energy, 100 missiles, 20 super missiles, 20 power bombs, and every item in the game, except for the screw attack.

How this glitch works and why is unknown, but is still extremely useful, although uncommonly used.