Door Jump

A Door Jump is a glitch in the original Metroid game that allowed Samus to jump inside of doors and walls. It is commonly used to find Secret Worlds. It is performed by doing the following steps. If you mess up while in the wall you will be stuck in the wall unless you die or reset your game.
 * 1) Open a door.
 * 2) Let the door close on Samus
 * 3) Rapidly press the A button and down on the directional pad.
 * 4) Once above the door, jump a bit to gain some distance.
 * 5) Repeat Step 3.