In the last two months I have gotten hooked on to a puzzle called KenKen. It is similar to Sudoku, but different. I never played Sudoku much so I am not the best person to do a compare and contrast. But like Sudoku it comes to us from Japan. It was invented by Tetsuya Miyamoto, a Mathematics professor.
Will Shortz of the New York Time explains how to play it.
The New York Times has other coverage, besides hosting new puzzles every day.
Try it. It’ll give you hours of enjoyment. Also, if you have school going children, especially elementary school kids, this is a good way to make practicing arithmetic or logic, fun.