Possibly the world’s oldest puzzle, developed over 2200 years ago by Greek mathematician Archimedes, this puzzle was not widely known until fairly recently. Consisting of 14 polygons (3-,4-, and 5-sided aka lattice polygons) of varying sizes and shapes that combine to produce a square, this mathematical challenge has over 500 solutions at last count.

The original concept of this puzzle lies in the problem of dissecting the area of a square into forms with whole number ratios. But is just as much fun as a not-so-simple puzzle, or perhaps used to create or match 2-D forms as with a Chinese tangram.