Dirt is a common obstacle in the game that Shovel Knight must clear to progress. Dirt appears as a 1x1 or 2x2 block and comes in different materials. Yellow/gold dirt requires only 1 strike to clear, and Shovel Dropping on it will cause Shovel Knight to bounce. Light yellow sandy dirt, also requires only 1 strike to clear, but Shovel Dropping will not cause Shovel Knight to bounce; he will drop straight through it. Grey dirt requires 2 strikes to clear.
For Specter Knight, he may fall through sand blocks and land on other blocks, but if he tries to jump off any block, they will take 1 hit.