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Land in the right side of the third Samus Eater on the floor of Hellway. The Samus Eater teleport will result in Samus being placed below the Power Bombs blocks, below the door. Use Spring Ball or Bombs to navigate past the thorns, Samus Eaters, and Yapping Maws. It can be helpful to use a Super to kill the first Yapping Maw.

Entrance condition:

{
  "comeInWithSamusEaterTeleport": {
    "floorPositions": [
      [
        15,
        13
      ],
      [
        1,
        13
      ]
    ],
    "ceilingPositions": []
  }
}

Requires:

{
  "or": [
    {
      "and": [
        {
          "ammo": {
            "type": "Super",
            "count": 1
          }
        },
        "h_canUseSpringBall",
        {
          "thornHits": 4
        }
      ]
    },
    {
      "and": [
        "h_canUseMorphBombs",
        {
          "thornHits": 3
        },
        {
          "samusEaterFrames": 320
        }
      ]
    }
  ]
}
{
  "or": [
    "canInsaneJump",
    {
      "thornHits": 1
    }
  ]
}