12

Entrance condition:

{
  "comeInWithSidePlatform": {
    "platforms": [
      {
        "minHeight": 2,
        "maxHeight": 2,
        "minTiles": 45,
        "speedBooster": true,
        "obstructions": [
          [
            1,
            0
          ]
        ],
        "requires": [],
        "note": "Applies to Halfie Climb Room."
      },
      {
        "minHeight": 3,
        "maxHeight": 3,
        "minTiles": 39.4375,
        "speedBooster": true,
        "obstructions": [
          [
            3,
            2
          ]
        ],
        "requires": [],
        "note": "Applies to Metal Pirates Room.",
        "detailNote": [
          "This has a 2-frame window for the jump,",
          "then a 1-frame or 2-frame window for the morph (after the transition), depending on the jump,",
          "with a last-frame jump giving a 2-frame morph window."
        ]
      }
    ]
  }
}

Requires:

"canInsaneJump"
"canMomentumConservingMorph"
"canTrickySpringBallJump"

Dev note: This strat is not very useful, since the in-room tricky dash jump into spring ball jump is easier.