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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1. The Overall Best Sudoku Book
A best-seller in its category, The Big Book Of Sudoku offers something for everyone. It includes more than 500 puzzles that range from easy to very difficult. There are only two per page so the puzzles are large and gentle on the eyes, and the spiral binding allows you to lay the book flat for comfort and ease of writing. Due to the wide range of options, this one's great for the beginner or those who appreciate variety. And it's a great pick for a crowd. However, it's a bigger book that might not be the easiest to travel with.
- Number of puzzles: 500+
One reviewer wrote: "This book is my first exposure to Sudoku. I've been using it for almost three years and I love it [...] The puzzles are challenging at each level, although I have improved a great deal since I started, so I'm faster than I used to be."
2. The Best Sudoku Book For Beginners
If you're just starting out or you prefer to use Sudoku as a means of gentler relaxation, Easy Sudoku is a great option. It has 300 puzzles that are fun, simple, and well-suited for a beginner — or someone who likes to multitask with the television on. Note that the puzzles are small (there are eight on each page) so it may not be best choice for those who prefer a bigger print, but it also makes the book compact and lightweight for travel. Some reviewers also noted that it was a good choice for kids.
- Number of puzzles: 300
One reviewer wrote: "Easy Sudoko puzzles. Just what I was looking for!"
3. The Best Sudoku Book For Relaxation (With Extra-Large Grids)
For a middle-of-the-road challenge, there's Relax and Solve from Brain Games. It offers over 150 puzzles that provide moderate mental stimulation, but are still calming after a tiring day. Each page contains a single puzzle, so this is the ideal option for those who don't want to strain their eyes — plus the wide spiral binding is durable and easy to hold. However, some noted that it's on the heavier and larger side, so it might not be the best for travel.
- Number of puzzles: 161
One reviewer wrote: "Just the right amount of brain exercise ... Not so difficult to pull your hair out, neither is it an easy breeze through. Love this."
4. The Best Extremely Hard Sudoku Book
With an introduction by puzzle-master and New York Times crossword editor Will Shortz, Surrender to Sudoku is the best pick for those who want to be challenged. There are 200 puzzles, and it has a 4.6-star rating after nearly 200 reviews because, as buyers say, the puzzles are "irresistibly hard." The grids are relatively large, but not as easy to read as the relaxation pick. However, it's a relatively lightweight option that's easy to carry with you. "Book is a nice size-small enough for my purse yet puzzles are large enough to easily fill in," one fan noted.
- Number of puzzles: 200
One reviewer wrote: "This was a gift for my husband who is an ace at Sudoku. It is hard to find a book with all difficult puzzles. This was a hit."