Our new Hexahedron Puzzle in a Box is a wonderful set for children who love a challenge!  These 16 pieces fit nicely in the box, but they also are a great building set to make many different designs.  See the pictures below for some ideas.  Due to the complexity of the angles on these pieces and the challenging nature of this puzzle, we recommend it for children who are at least 6 years of age.  The box measures 3 3/4" each way.  Made in Germany.