Spread or viscosity is a property of elements in Powder Game. It describes whether or not different particles of the element will spread out, either vertically or horizontally. For example, liquids will spread horizontally and vertically. Powders will spread vertically, except for superball, which does not spread. Vertical spread only occurs when falling.
Vertical and horizontal elements
The following elements spread both horizontally and vertically:
The following elements only spread vertically; they will fall or rise:
The following elements do not spread, or are an exception to spreading: