All the starting numbers have been stripped away, leaving you with something truly intriguing: Naked Sudoku. Each puzzle is a variation on regular sudoku, but there are no starting numbers to help. Instead, you must use other types of clues to determine where to begin. In one variant, for instance, greater-than and less-than signs point out the way. These are sudoku puzzle...more
Paperback, 240 pages
Published October 6th 2009 by Puzzlewright
(first published 2009)
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I highly recommend this book if you're looking to lose your mind, self confidence, or countless hours in futile pencil marks and eraser rubs before finally realizing that, indeed, the very first number you wrote - the only one written dark and bold, you were so sure of it - was wrong. I also recommend it as a gift. If you hope never to hear from the recipient again.