The Pentominoes, Some of the oldest poly form wooden puzzles first formed as chessboards. Our Solid Pentominoes game is a fun geometry brain teaser, containing the classic 12 Pentominoes pieces and a square piece. Each of the Pentominoes pieces consist of five squares joined edge to edge forming different shapes. You may find the shapes of the alphabet letters: I,L,P,T,U,V,W,,Y,Z. the F looks like it had an accident and N takes some imagination. The Solid Pentominoes offer great challenges to the puzzler. For example: Try build a rectangle size 6x10 - This rectangle has 2339 different solutions. A 3x20 rectangle has only 2 solutions. A 4x15 rectangle has 368 solutions. A 5x12 rectangle has 1010 solutions. A 5x4x3 cube has 3940 solutions. A 6x5x2 cube has 264 solutions. A 10x3x2 cube has 12 solutions. This version comes complete with a box and a lid so that the pieces can be stored away for safe keeping, as well as a challenges booklet, we created, that includes many challenges and the solutions, to start the playing. For age 13 or adults.