Grapple to the top Grapple in the top-left corner of the room. Hold left while waiting for the grapple wall jump check to expire, then quickly morph. While falling, unmorph to reset fall speed and then quickly morph again. unmorph at a precise time (typically a 2-frame window) then use Grapple immediately (another 2-frame window) to get stuck standing a pixel or two inside the first Grapple block above the door. Then jump (to force crouch), angle down, and grapple. Samus will enter a 'glitched grapple hanging' state where Samus' graphics will appear corrupted while swinging with Grapple. Swing down, and hold left while approaching the door to trigger the transition. To avoid heavy lag, hold down through the entire swing. Continue holding Grapple through the door transition to initiate a teleport in the next room. If needing to stand up in the next room (e.g. for an X-Ray climb), then enter the transition while swinging slowly, e.g. after coming to a stop directly below the block. If needing to transition at horiziontal position 21 (as far right as possible), then additionally roll from pressing left to pressing diagonally up-left just before the transition. The game may lag heavily if Samus enters a retracted position; if this happens, hold down to extend Grapple again.