A growing interest in calm, routine mental engagement is reshaping how older adults spend quiet moments each day. Many ...

Sudoku fans, it’s time to really crunch some numbers. Give your mind the ultimate test on the most difficult numbers puzzle each day — and challenge yourself to make the impossible possible.

Fill the grid so that every row, every column and every 3x3 box contains the numbers 1 to 9. To see the completed puzzle, buy the next issue of the Guardian (for puzzles published Monday to Thursday).

Fill the grid so that every row, every column and every 3x3 box contains the numbers 1 to 9. To see the completed puzzle, buy the next issue of the Guardian (for puzzles published Monday to Thursday).

Sudoku is easy to understand: All you have to do is fill in a grid with numbers. Within those constrictions, it turns out, there's a lot of room for variety, and a sudoku puzzle can be easy enough for ...