Jump on the Snail when it is at a precise location, and then crouch jump through the ceiling and jump again, without moving between jumps. The Snail's positioning is very precise, but it is more lenient with Morph and an X-Ray Turn Around. X-Ray can also be useful for helping position the Snail.

Requires:

"Gravity"
"canUseEnemies"
{
  "or": [
    "canPreciseCeilingClip",
    "canXRayCeilingClip"
  ]
}