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.

Entrance condition:

{
  "comeInWithSpringBallBounce": {
    "speedBooster": false,
    "remoteAndLandingMinTiles": [
      [
        6.4375,
        0
      ]
    ],
    "movementType": "controlled"
  }
}

Requires:

{
  "notable": "Spring Ball Bounce Right to Left"
}
"SpeedBooster"
"canCrossRoomJumpIntoWater"
"canTrickySpringBallBounce"