Blokus is a quality, turn-based abstract strategy game in which you are in charge of 21 Tetris-like pieces ranging from one to five squares. Your goal is to place as many of them on the board as possible, following only two placement rules: 1) Your first piece must start in your corner; and 2) All subsequent pieces must be placed diagonally (and only diagonally) adjacent to one of your already-played pieces.