Place the PB on the block next to the leftmost Boyon, in order to double hit all Boyons and break the PB blocks.

Requires:

{
  "obstaclesNotCleared": [
    "A"
  ]
}
{
  "enemyKill": {
    "enemies": [
      [
        "Boyon",
        "Boyon",
        "Boyon",
        "Boyon"
      ]
    ],
    "explicitWeapons": [
      "PowerBomb"
    ]
  }
}

Clears obstacles: A, B