"If you have to ask, IT'S TOO HARD FOR YOU"--Cover.

With every puzzle requiring upper-level strategies, this collection packs even more of a punch than Beyond Black Belt Sudoku. You'll encounter common advanced techniques with curious-sounding names like Sashimi X-Wing, Swordfish, and Gordonian Polygon, as well as some tricky new things, including Grouped X-Cycle and 3D Medusa. The puzzles grow increasingly difficult as the book goes along, from "pretty darn hard" to "excruciating."

From Nikoli, the Japanese puzzle company that created the sudoku craze, comesa title that starts at hard and goes to a level of difficulty not seen in anyprevious books.

The vast majority of sudoku puzzles that are labeled hard, expert, challenger, are not really all that difficult. And in a surprising number of cases, they are downright easy. Part of the Absolutely Nasty Sudoku series, this book provides basic and intermediate puzzles and techniques.

With a separate sudoku book for every level, all puzzle lovers can play this wildly popular, incredibly addictive game that's appearing in major newspapers all over Taking a page from karate--another Japanese art--each title is graded by color: White Belt for easy, Green Belt for medium level, Brown Belt for hard, and Black Belt for the super-tough solvers. And because each book has an amazing 300 puzzles, the fun can go on for hours.

Extra tricky. Extra tough. It's the sudoku collection that's not for the faint of heart. If you're craving the challenge, sharpen your pencil and pit your wits against the Japanese puzzle-makers at the top of their game. In each of these more than 300 handcrafted puzzles, ranked by difficulty from expert to x-treme to ultimate, every move is an adventure, a one-on-one challenge with a grandmaster who delights in elegance, symmetry, and building in the occasional roadblock. But keep going. You'll solve it eventually... you genius! Can't get enough? Look for: The Original Sudoku The Original Sudoku Book 2 More Original Sudoku X-treme Sudoku Expert Sudoku The Original Sudoku Page-a-Day Calendar

SUDOKU: The hotter-than-hot puzzle phenomenon that everyone wants to play! Sudoku’s everywhere these days, and winning millions of converts worldwide. And why not? It’s irresistibly good brainteasing entertainment, the rules are simple (even when the particular game isn’t), and it requires no math skills…just logic. Sterling has a book for everyone eager to get in on the game, no matter what level. There are puzzle collections to keep sudoku lovers occupied for hours, guides to strategy for the perplexed, series that take solvers from novice to expert, and compilations packaged in fun shapes. “The new international craze!”—The New York Times “Puzzle fans are playing the numbers with sudoku...the underlying complexity is what attracted millions worldwide.”—USA Today “People are wild about it...”—Sherry Stern of the Los Angeles Timees