If you're looking for a brain-stimulating, screen-free activity, the best Sudoku books have you covered. (In fact, research shows that brain teasers can reduce stress and keep your memory sharp.)
The main factor you'll need to consider when deciding on a book is the difficulty level. Some options (like the first pick below) offer a range of puzzles that run from easy to hard; this is probably the best option for someone who's just starting out with Sudoku but wants to advance to more challenging puzzles down the line, or if the book will be used by more than one person. On the other hand, some players know exactly which difficulty levels they like and prefer to stay there. For those buyers, a book with one specific difficulty level is a better bet.
As with any kind of brain-stimulating game, presentation is also important — after all, you'll be staring at it for quite a while. Make sure that the individual puzzle sizes are suited to your liking, the pages are bleed-resistant, and the cover is durable (especially if you'll be traveling with it). The four Sudoku books have all of those qualities and more, and there's one for every preferred difficulty level which can be delivered right to your door.
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