Shinespark to the first ledge. To use a flash suit in deep sand: vertically - quickly roll the directional inputs from forward to up and jump. diagonally, with minimal horizontal speed - while holding angle, quickly tap forward then press and hold jump.

Requires:

"Morph"
"canPlayInSand"
{
  "useFlashSuit": {}
}
{
  "shinespark": {
    "frames": 17,
    "excessFrames": 4
  }
}
{
  "or": [
    "HiJump",
    "canSpringBallJumpMidAir",
    "canSunkenTileWideWallClimb"
  ]
}