Sand Blocks are a common obstacle in Shovel Knight: Treasure Trove that the protagonist must clear to progress.
Sand Blocks appears as either a 1x1, 2x1, 2x2, 3x2, or 3x3 block with light yellow color. It requires only 1 strike to clear, and Shovel Dropping or Shoulder Bashing on it will cause Shovel Knight/King Knight to fall straight through it. For Specter Knight, who naturally damages blocks every time he jumps on them, Sand Blocks are particularly dangerous, as he will fall through them immediately if he lands on them from a height.