Free polyomino

A free polyomino is a shape made up of little squares connected together. It's like if you took a bunch of little colored blocks and put them together in a row so that every side of each block was touching at least one other block. When you're finished, you'll have a shape like a snowman, or a picture of a telephone, or really anything you can imagine! Free polyominoes are very popular in games, because you can use them to make pictures, puzzles, and even entire levels in video games.