40d:Mud

Indoor mud is created by filling a floor tile with water, then letting the water evaporate. Outdoor mud is created by covering any soil tile with water. Creating mud is essential to providing irrigation for subterranean crops, as well as any crops indoors. The most common sources for mud are the results of irrigation, farming, and draining water sources.

If an underground river or lake has been revealed, muddy tiles that are Subterranean will spontaneously grow tower-cap trees and shrubs. Like trees and shrubs that grow on grass, these can be harvested and will yield wood and subterranean crops.

Building a dirt road over muddy soil will remove the mud quite quickly. Placing a building (such as a statue) on a muddy tile will also clear away mud, even if the tile was smoothed and/or engraved stone. Building a construction or a paved road will also remove mud, but has the disadvantage of destroying engravings and unsmoothing the floor as well as changing any mineral floors to the current layer stone.^{v0.28.181.40d}

In adventurer mode, mud objects which you can pick up from muddy tiles are edible.^{v0.27.176.38c}