Run into the room using exactly 20 tiles of runway (with an open end) in the other room, or up to 11 pixels more or 1 pixel less (getting extra run speed $4.5 or $4.6). Jump toward the end of the runway, quickly aim down, and then morph when close to the ceiling. Land on the last pillar, turning around to the left (while still morphed) to instantly cancel Samus' horizontal speed if needed.

Entrance condition:

{
  "comeInRunning": {
    "speedBooster": true,
    "minTiles": 19.9375,
    "maxTiles": 20.6875
  }
}

Requires:

{
  "notable": "Tricky Speedy Airball (Left to Right)"
}
"canSuitlessMaridia"
"canTrickyDashJump"
"canLateralMidAirMorph"

Dev note: The reason to hold the aim-down pose is because its lower base horizontal speed makes it easier to avoid bonking the overhang when entering with speed $4.6 (the larger of the two speeds that work); an alternative that can also work is to jump on the earlier part of the runway and do a quicker morph. Speeds above $4.6 cause Samus to bonk the ceiling, losing all vertical speed, or the overhang, losing all horizontal speed; there is a significant amount of vertical speed to lose, even though it may not appear that way because of how the sandfalls push Samus down. It is technically possible to make it across with a speed of $4.4, but it requires a last-frame jump and a tight morph, and it would be easier in that case to just spin jump across and not morph. Speeds in the range from $4.0 - $4.3 give a spike in jump speed, resulting in an early ceiling bonk.