Arm pump while approaching the left gate from the right, perform a very low spin jump, and aim down to clip inside the gate. Failure results in a soft-lock.

Samus must use arm pumping to advance a minimum of about 6 pixels, to have an opportunity for a frame-perfect jump, with a single-frame tap of jump. If advancing by about 12 pixels or more, then tapping jump for 2 frames becomes possible (still frame-perfect). If advancing by about 16 pixels or more, then a 2-frame window for the jump becomes possible.