Tiling Game v0.1.0 TilingGame.Pentomino View Source
Pentomino is what we call the shape of a piece in the game.
These pieces are the sum of the set of pentominos, tetrominos, trominos,
and the domino and monomino - but we'll call it by its biggest shapes.
https://en.wikipedia.org/wiki/Polyomino
Each pentomino square is represented as a grid position in a 5x5 grid. However, the 5x5 grid has been flattened to an array, with positions represented by a single integer in the range 0..24