If needed, use a hero shot to open the door with a running jump, then turn around mid-air to land back on the platform.

If needing to leave with Speed Booster tricky dash speed ($2.0 or $2.1), it will be necessary to begin with Speed Booster unequipped, then equip it after jumping.

Requires:

"canHeroShot",
"canTrickyJump"

Exit condition:

"leaveWithMockball": {
  "remoteRunway": {
    "length": 7,
    "openEnd": 2
  },
  "landingRunway": {
    "length": 4,
    "openEnd": 1
  },
  "minExtraRunSpeed": "$1.E"
}

Unlocks doors:

{"types": ["ammo"], "requires": ["never"]}

Dev note: With Speed Booster equipped, speeds as low as $1.B can work.