Magic square , Magic Hexagon
TriHex is a number puzzle based on magic squares and magic hexagons, with 4 levels from fairly simple to almost impossible! Extremely challenging. On the hardest level there are over 50 million solutions but finding just one can be difficult. There are 59456127 ways of placing the numbers 1 – 24 in the correct order so that all the horizontal and diagonal lines add up to 75.