Wait for the top hopper to move right, then jump through the left hopper. The left hopper may be harder to dodge if the camera is scrolled to the left.

Requires:

"ScrewAttack"
"canCarefulJump"
{
  "or": [
    "canTrickyJump",
    "SpaceJump",
    {
      "enemyDamage": {
        "enemy": "Blue Sidehopper",
        "type": "contact",
        "hits": 1
      }
    }
  ]
}

Unlocks doors:

{"types":["super"],"requires":[]}
{"types":["missiles","powerbomb"],"requires":[{"enemyDamage":{"enemy":"Blue Sidehopper","type":"contact","hits":1}}]}