Use a Super on the top and bottom blocks. Crystal Flash below the lower block to standup and then begin Moondancing. After Samus sinks through the bottom tile, use a Super to break the final block, then use Grapple to get out of the floor. Without Grapple, count to 174 Moonfalls and delicately Moonfall to prevent clipping into the ground.

Requires:

{
  "ammo": {
    "type": "Super",
    "count": 3
  }
}
"h_CrystalFlash"
"canMoondance"
{
  "or": [
    "canCount",
    "Grapple"
  ]
}

Exit condition:

{
  "leaveWithStoredFallSpeed": {
    "fallSpeedInTiles": 1
  }
}

Dev note: Obstacle A doesnt need to be checked, because there is no reason to have destroyed more than one block, with Morph. FIXME: This should have a pixel precise setup to prevent using another Super.