Pentomino Chess PuzzleContains 13 solid pieces: 12 made from five cubes and one square of four cubes. Offers a unique mathematical challenge with thousands of possible assemblies. Objective: fill the framed space to form a checkered square using every piece. Includes 64 different board solutions, with one alternating color solution like a chessboard. After completing the checkerboard, try building a 444 cube. Hundreds of other shapes possible: letters, geometric forms,