土块s are one of the most common block types in the game, covering the majority of the world's surface. They are almost surely the most visible and accessible block to new players, making them useful for building a rudimentary shelter to take refuge during the first night. Dirt blocks may be covered by regular 草, corrupted grass, crimson grass, or 神圣草 (upon engaging 困难模式), which spreads from nearby grass-covered dirt blocks. It can be moved around freely with a 土魔杖.
Dirt can appear almost everywhere throughout the world. All caves above the elevation of 0 ft are made of dirt. When the 地下 starts (<0 ft), the caves are made of roughly 50% dirt. Small patches of dirt can be found in the 洞穴 layer, though it is mostly made of 石. After the 血肉墙 has been defeated in a world, new dirt is formed when 泥块s are converted by 腐化 or 猩红.
Dirt blocks are one of the most fragile blocks in the game. A single hit from most 镐 will successfully mine them, but dirt blocks with any kind of 草 on them will take one more hit. Dirt below sea level, as well as dirt surrounded by blocks on all 8 sides, serves as a natural barrier for 腐化之地, 猩红之地, and 神圣之地, as it cannot be converted without grass growing on it.