Use a 3-tap or 4-tap to gain a speedball with a specific amount of speed in the other room (between $2.1 and $2.3 extra run speed), and either roll in or do a controlled bounce to enter while descending close to the ground. Bounce across the room, destroying the Evirs along the path, then bounce on the sand at the left side of the room, and unmorph to go straight up in the single-tile-wide space with no sandfall; perform a pause remorph to chain temporary blue to the door.

Entrance condition:

{
  "comeInWithBlueSpringBallBounce": {
    "movementType": "controlled",
    "minExtraRunSpeed": "$2.1",
    "maxExtraRunSpeed": "$2.3"
  }
}

Requires:

{
  "notable": "Cross-Room Blue Spring Ball Bounce (Right to Left)"
}
"canTrickyDashJump"
"canTrickySpringBallBounce"
"canPauseRemorphTemporaryBlue"
"canBeVeryPatient"

Exit condition:

{
  "leaveWithTemporaryBlue": {}
}

Unlocks doors:

{"types":["ammo"],"requires":[]}