Pyruko

Pyruko is a two-dimensional logic puzzle that can be transformed into a three-dimensional puzzle. The puzzle consists of 36 individual triangles that form four larger triangles. The directions are simple: fill in the grid so that each of the four triangles that make up the main triangle contains the numbers one through nine. Additionally, when the grid is folded into a pyramid (or "tetrahedron" for all the math-whiz types) each of the four axes must also contain the numbers one through nine. A thoroughly original variation on the popular puzzles that dominate the market, the power of Pyruko will delight and enthrall game lovers of all ages.