Entrance condition:

{
  "comeInWithGMode": {
    "mode": "indirect",
    "morphed": false
  },
  "comesThroughToilet": "any"
}

Requires:

"Morph"
{
  "or": [
    {
      "and": [
        "Gravity",
        {
          "or": [
            "HiJump",
            "canWalljump",
            "SpaceJump",
            "canIBJ",
            "canSpringBallJumpMidAir",
            "canSpringBallBombJump",
            "canGravityJump"
          ]
        }
      ]
    },
    {
      "and": [
        "canSuitlessMaridia",
        {
          "or": [
            {
              "and": [
                "HiJump",
                "canSpringBallJumpMidAir"
              ]
            },
            "canUnderwaterWalljump"
          ]
        }
      ]
    },
    {
      "and": [
        "h_navigateUnderwater",
        "canTrickyUseFrozenEnemies",
        {
          "ammo": {
            "type": "Super",
            "count": 1
          }
        },
        {
          "or": [
            "canInsaneJump",
            "Spazer",
            "Wave",
            "Plasma",
            {
              "ammo": {
                "type": "Super",
                "count": 1
              }
            }
          ]
        }
      ]
    }
  ]
}

Dev note: Direct G-mode will have an open door and Samus will fall. Indirect will require a doorlock bypass in the room below. FIXME: A direct G-mode regain mobility and fall through the door would be possible if entering on the right side of the door, but there is not a way to represent that yet.