123

Entrance condition:

{
  "comeInWithGrappleSwing": {
    "blocks": [
      {
        "position": [
          8,
          2
        ],
        "note": "Bowling Alley"
      },
      {
        "position": [
          7,
          3
        ],
        "obstructions": [
          [
            6,
            10
          ]
        ],
        "note": "Red Brinstar Firefleas Room"
      },
      {
        "position": [
          9,
          2
        ],
        "note": "Climb Supers Room, Bubble Mountain, Lava Grapple Tunnel"
      }
    ]
  }
}

Requires:

"canTrickyGrappleJump"

Dev note: Entering from Pants Room (suitless) apparently doesn't work, due to not being able to get enough horizontal speed.