If you’ve opened a newspaper or a magazine in the last 20 years or so, you’ve probably seen Sudoku lurking in the back pages. Next to the familiar crosswords and chess puzzles, it can be a strange ...

Daily puzzlers would be quick to tell you that sudoku, Wordle’s mathematical cousin, is not as easy as it looks. The small grid, found often next to a word scramble or comic strip in a print newspaper ...