Carefully walk through the room. It is possible but tricky to do so damageless.

Requires:

{
  "notable": "R-Mode Blue Suit"
}
{
  "obstaclesCleared": [
    "D"
  ]
}
"Morph"
{
  "or": [
    "canTrickyJump",
    {
      "acidFrames": 10
    }
  ]
}

Clears obstacles: A