A polyomino is a group of identical squares joined along their edges.

A monomino is the simplest polyomino, consisting of a single square.

monomino

Monomino

A Domino consists of two squares joined along a common edge.

domino

Domino

A Tromino consists of three squares joined along at least one edge. There are two types:

straight-tromino

Straight Tromino

right-tromino

Right Tromino

A Tetromino consists of four squares joined along at least one edge. There are five types:

straight-tetromino

Straight Tetromino

square-tetromino

Square Tetromino

skew-tetromino

Skew Tetromino

L-tetromino

L Tetromino

T-tetromino

T Tetromino

There are various puzzles involving tetrominoes, the most popular is to form a square out of any four tetrominoes.

puzzle-board

There are twenty ways to do this, using one, two and three different tetrominoes. Try and locate as many as you can.