Kill the Metroids while artificially morphed with just Spring Ball to avoid them. A Metroid (or a Rinka) must be completely on screen while a Power Bomb explodes in order for it to lure the other Metroids. Because of this, with extra ammo, it is possible to kill one of them before luring the rest. In general, this seems to be easiest by minimizing Samus's horizontal movement as much as possible and getting the Metroids in sync with each other while circling around her. While moving horizontally, their movement is less predictable and harder to sync. Note that it is necessary to exit G-Mode before exiting the room in order for the Metroids to remain killed.

Entrance condition:

{
  "comeInWithGMode": {
    "mode": "any",
    "morphed": true
  }
}

Requires:

"canMetroidAvoid"
"h_canArtificialMorphSpringBall"
{
  "ammo": {
    "type": "PowerBomb",
    "count": 4
  }
}

Clears obstacles: A