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 be repeated more than once in the square or in a horizontal or vertical row ...

Henry Ernest Dudeney posed the famous dissection problem of transforming a triangle into a square by cutting it into as few pieces as possible. In a new study, researchers have finally proved that the ...

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

Here's today's Connections answer and hints for groups. These clues will help you solve New York Times' popular puzzle game, ...

Let's keep winning. The answer to the March 7 (1357) Wordle is TROOP. Past Wordle answers can give you some excellent ideas ...