With new year setting in, the mind is ready for a challenge. January is International Brainteaser Month, and its time to oil ...

Puzzles and Sudoku (number-placement puzzles) may be familiar to many Japanese as they are often seen in newspapers and magazines. Japanese participants have been strong competitors since the ...

January is the ideal month to kick off working on that ticking brain, to tease it and challenge it into staying sharp. With ...

For example, the same single integer may not appear twice in the same row, column, or any of the nine 3×3 subregions of the 9×9 playing board. French newspapers featured variations of the Sudoku ...