Pentomino

A pentomino is a polyomino of five squares.

The ancient pentomino puzzle uses free pentominoes.

The shapes
There are 12 free pentominoes. Six of them are chiral, making a total of 18 one-sided pentominoes.

Chiral
These come in mirrored pairs:

Games with pentominoes

 * Tetris 2 + BomBliss
 * Super Tetris 2 + BomBliss
 * Tetris 64
 * Magical Tetris Challenge
 * Pokémon Tetris
 * Puyo Puyo Tetris
 * Palatris (Dualtris)
 * CubeStorm Planets
 * Multiblocks
 * NullpoMino Forks and Mods