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

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

**Monomino**

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

**Domino**

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

**Straight Tromino**

**Right Tromino**

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

**Straight Tetromino**

**Square Tetromino**

**Skew Tetromino**

**L Tetromino**

**T Tetromino**

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.

**Solution**