In the previous room, gain max run speed without Speed Booster equipped, requiring about 7 tiles of runway (obtaining an extra run speed of $2.0). Enter the room either in a mockball (or process of mockballing), or descending from a controlled Spring Ball bounce. Just after the transition, jump or bounce to slightly less than full height. Pause to equip Speed Booster before bouncing on the first Grapple platform; this provides a boost in the bounce height to be able to make it to the Grapple platform below the top door.