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X-treme Sudoku (Anglais) Broché – 29 janvier 2007

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Book by Editors of Nikoli Publishing

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Il n'y a pas encore de commentaires clients sur Amazon.fr
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Commentaires client les plus utiles sur Amazon.com (beta)

Amazon.com: HASH(0x8d9f66fc) étoiles sur 5 47 commentaires
17 internautes sur 17 ont trouvé ce commentaire utile 
HASH(0x8daa97bc) étoiles sur 5 It'll be hard to go back... 1 juin 2007
Par Tamara M. - Publié sur Amazon.com
Format: Broché
...to computer generated sudoku after you start playing these. I don't know what it is, but somehow, these handcrafted puzzles don't only look so much cooler, they're actually funner!

The book comes with two levels of challenge - creatively titled "Difficult" and "Very Difficult." Even though I'm relatively new to these puzzles, I'd posit that the former really should be called "Moderate," using the standardly accepted levels of difficulty. My only gripe with the book is that I wish the page's measurements were bigger, but that's personal preference.

Nonetheless, this is a great buy with 320 puzzles, and it'll likely last you a long time!
6 internautes sur 6 ont trouvé ce commentaire utile 
HASH(0x8daa9780) étoiles sur 5 A great series of Sudoku books 19 août 2008
Par Thomas W. Roth - Publié sur Amazon.com
Format: Broché
The Nikoli books are really the best Sudoku books out there. They select puzzles which can be solved using logic rather than the really esoteric methods you can find out about on Sudoku web pages like X Wing and Swordfish. This tends to make them more fun because they are hard yet with enough effort can be solved. They also have a brief but helpful section with some strategy.
How many books have you bought which are half worthless because you don't enjoy working the simple puzzles any longer? Well, these books are specifically made with only the tougher puzzles so you get more fun for your money.
Otherwise the criticisms are true: it's a small book, which can be good since it takes up little space yet bad because you'll have trouble opening it very wide to write in since it's small and fat. If only they made it in a spiral format I'd give it 5 stars.
It probably has few reviews because they aren't sold everywhere but they 're worth the effort to find and certainly worth purchasing. Printed on good paper, too, in case you need to erase or make pencil marks in the boxes.
5 internautes sur 5 ont trouvé ce commentaire utile 
HASH(0x8e10b504) étoiles sur 5 Nikoli is the only Sudoku 15 février 2011
Par Mark S. Millman - Publié sur Amazon.com
Format: Broché Achat vérifié
I've been addicted to Sudoku now for about four years and discovered the Nikoli series a couple of years ago. I've completed a few thousand Sudokus including all the Nikoli books: Original Sudoku One & Two, More Original, Expert, and X-Treme (twice now). They are a pure joy and obviously created by craftsmen whose wicked wit shows through. Nikoli Sudoku have made me laugh and wince. A simple puzzle might mean that you spend 30 minutes finding the first key and then the puzzle unravels or a hard puzzle may mean that you get the first dozen numbers immediately and are then stymied for half a day. Easy or hard, Nikoli Sudoku leave me feeling satisfied.

What frustrates me about other Sudoku books is the number of times a 'hard' puzzle is just hard because you are forced to trial and error endings, where you are stuck with no where to go and have to start trying to pick one of a pair in order to discover a bust. In a book like X-Treme Sudoku by Nikoli I might be forced to that inelegance once or twice but even then on review I can see that there was a way to solve the problem. It might require 3 or 4 levels of indirection, but that's what 'hard' Sudoku are should to be about.

Nikoli Sudoku can be very personal, I feel like they are a game between me and another human being. They are now the only Sudoku I do.
8 internautes sur 10 ont trouvé ce commentaire utile 
HASH(0x8e112228) étoiles sur 5 Style Over Substance 16 octobre 2011
Par E. Vessal - Publié sur Amazon.com
Format: Broché
I bought this book after reading the claim on the cover that one could find some of the "hardest, toughest, and roughest puzzles" within. I must say that I am generally disappointed with the level of difficulty on these puzzles. I've completed about 10 so-called "difficult" puzzles, and about 5 rated as "very difficult", and have found most of these puzzles to be rather simple. Most of these puzzles can be solved with lower-level techniques such as naked pairs (and triples) and intersection removal, and maybe an X-wing here and there. The puzzles, which are handcrafted rather than computer generated, look aesthetically pleasing as they are placed symmetrically and create some pleasing patterns. However, this book was purchased with the belief that the book would make good on its claims of the difficulty level, and in that regard I have to feel let down. Skip this book and look at the Extreme Sudoku series by Antoine Alary and the Absolutely Nasty Series by Frank Longo for some truly diabolical puzzles that will challenge you.
3 internautes sur 3 ont trouvé ce commentaire utile 
HASH(0x8db780f0) étoiles sur 5 This was my favorite Sudoku book ever 23 août 2009
Par John - Publié sur Amazon.com
Format: Broché
There definitely IS something nice about these hand-crafted puzzles. I found as I worked my way through the book that it became a cat and mouse chase as I learned what the author of the puzzle was doing - and it was slightly different in each puzzle. Someone else wrote about having to guess in some of the more insane computer generated puzzles. I would never want to work a puzzle where guessing was ever part of the solution. These puzzles use pure logic. It is a joy when you finally crack the really hard ones. This book kept me entertained for almost two years. (Mind you I rarely spend more than 15 minutes in a day at these things.)

As far as all the comments about the size of the book there was a simple solution - rip each puzzle out of the book like a note pad. They all came out clean, then it is easy to work on both sides!

I don't know why they waste all the extra pages to print the solutions. Does anyone ever look at the answers? You know when you get it, and you know when you don't.
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