Hex or Nash is a two-player game played on a rhombic board with hexagonal cells. It was invented by a Danish mathematician Piet Hein in 1942,and became popular under the name of Hex.„ Hex or Nash is a two-player game played on a rhombic board with hexagonal cells. „ It was invented by a Danish mathematician Piet Hein in 1942, and became popular under the name of Hex