Long before the Sudoku number puzzle became the crack cocaine of brain teasers, a bored Benjamin Franklin jotted down a couple of much more complex number puzzles of his own. But, exactly how the U.S.

Math Riddles: This is a Magic Square. Only 1% of people with a high IQ can find the missing numbers in this tricky logic magic square puzzles in 20 seconds. Math Riddles are so challenging, but that ...