Swing up through the door from a Grapple block in the room below (Mt. Everest). Use arm pumps to move two tiles to the left, to avoid the overhang and floating platform.

Entrance condition:

{
  "comeInWithGrappleSwing": {
    "blocks": [
      {
        "position": [
          12,
          5
        ],
        "environment": "water",
        "note": "Mt. Everest"
      }
    ]
  },
  "comesThroughToilet": "any"
}

Requires:

"HiJump"
"canPreciseGrappleJump"