This is another pleasure, albeit a not-so-guilty one. Sudoku is a logic-based number placement puzzle, for anyone who doesn't know, although it's hugely popular, and I expect everyone has seen it before by now. The game was invented by an American architect Howard Garns in 1979 and, published by Dell Puzzle Magazines and called "Number Place," but it became super popular in Japan where it was renamed. Sudoku roughly means "Single Number" by my understanding.
Why are these types of games and puzzles good for you? Because they are incredibly good "exercise" for your mind. Challenging your mind to "learn new tricks" and keep on its toes can actually help you prevent Alzheimer's disease and dementia as you age. It can also relieve stress and keep you mentally balanced and socially connected.
Now I've done my part to enrich your brains, all you have to do is go out and do it!