For challenges that involve polyominoes of some sort. Polyominoes are shapes made of concatenating the edges of equally sized squares to create a form of square tiling. Tetris is a well known example of something involving polyominoes. This tag also refers to challenges that relate to polyominoes formed with shapes other than squares (also known as polyforms)
This tag is for challenges that relate to either polyominoes or polyforms, such as graphical-output challenges about displaying such shapes, sequence challenges based around numbers relating to them, and more.