1234

Requires:

"Gravity"
{
  "noBlueSuit": {}
}
{
  "or": [
    "canTrickyJump",
    "Ice",
    "ScrewAttack",
    {
      "enemyKill": {
        "enemies": [
          [
            "Evir"
          ]
        ],
        "explicitWeapons": [
          "Plasma",
          "Super",
          "PowerBombPeriphery"
        ]
      }
    },
    {
      "enemyDamage": {
        "enemy": "Evir",
        "type": "particle",
        "hits": 1
      }
    }
  ]
}
"canPlayInSand"
{
  "or": [
    "canWallJump",
    "HiJump",
    "canUseFrozenEnemies"
  ]
}

Dev note: Technically it could make sense to clear obstacle A if the Right Evir is killed, but with Gravity it is irrelevant.