Requires:

{
  "or": [
    "h_ClimbWithoutLava",
    {
      "obstaclesNotCleared": [
        "B"
      ]
    }
  ]
}

Exit condition:

{
  "leaveWithRunway": {
    "length": 4,
    "openEnd": 0
  }
}

Dev note: It is sometimes possible to beat the lava, but it depends how you get here.