Entrance condition:

{
  "comeInWithGrappleSwing": {
    "blocks": [
      {
        "position": [
          13,
          5
        ],
        "environment": "water",
        "note": "Mt. Everest"
      },
      {
        "position": [
          7,
          3
        ],
        "note": "The Precious Room"
      }
    ]
  }
}

Requires:

"canTrickyGrappleJump"

Dev note: This is only useful as a way to preserve a flash suit without Hi-Jump or wall jump. FIXME: This can be possible from other rooms, with greater difficulty.