A polyomino is a group of identical squares joined along their edges.
A monomino is the simplest polyomino, consisting of a single square.
A Domino consists of two squares joined along a common edge.
A Tromino consists of three squares joined along at least one edge. There are two types:
A Tetromino consists of four squares joined along at least one edge. There are five types:
There are various puzzles involving tetrominoes, the most popular is to form a square out of any four tetrominoes.
There are twenty ways to do this, using one, two and three different tetrominoes. Try and locate as many as you can.