We have the answer for Puzzle that looks vaguely like a crossword to people who have never solved a crossword crossword clue ...

In 1907, the English author and mathematician Henry Ernest Dudeney posed a puzzle: Can any equilateral triangle be cut into ...

Killer sudoku is similar to the other levels in that each of the numbers 1-9 must fit into each 9-by-9 square. No number can ...

Henry Ernest Dudeney posed the famous dissection problem of transforming a triangle into a square by cutting it into as few ...