Extreme Sudoku - Very Difficult Sudoku Puzzles and Solver ... Sudoku Too Easy? ... Solving these puzzles is a different matter entirely, since these are the most difficult puzzles we create. Difficulty depends on the type of steps required to solve them, and also on the number of each type of step.
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www.extremesudoku.info/
www.extremesudoku.info/
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A Finnish mathematician on Monday claimed he had created the world's hardest sudoku puzzle, a brain-teaser which required three months' work and a billion combinations to produce. ... "AI Escargot is the most difficult sudoku-puzzle known so far," the puzzle's 37-year-old creator and applied mathematician Arto Inkala told AFP.
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www.usatoday.com/news/offbeat/2006-11-06-sudoku_x.htm
www.usatoday.com/news/offbeat/2006-11-06-sudoku_x.htm
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Sudoku: play sudoku online at Saidwhat, over 100 sudoku puzzles of varying difficulty, strategy tips. Unique sudoku player: wrong moves, pencilmarks and more ... - Play an Easy Sudoku; - Play a Moderate Sudoku; - Play a Difficult Sudoku; - Play a Very Hard Sudoku; - Play a Fiendish Sudoku; - Sudoku Generator...
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www.saidwhat.co.uk/sudokus/index.php
www.saidwhat.co.uk/sudokus/index.php
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Free Sudoku Puzzles: Difficult SuDoku Puzzle No.112 - Solution ... Free Sudoku Puzzles ... sudoku solutions...
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puzzles.about.com/od/freesudokusolutions/qt/hsudokusol1...
puzzles.about.com/od/freesudokusolutions/qt/hsudokusol112.htm
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Sudoku XY-Wing can solve some of your most difficult Sudoku puzzles. This illustrative article will help you identify and solve Sudoku successfully. ... Sudoku XY-Wing Solves Difficult Sudoku Puzzles...
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www.sudokuessentials.com/Sudoku-XY-Wing.html
www.sudokuessentials.com/Sudoku-XY-Wing.html
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Check Checks if there are any direct violations of the Sudoku rules. A Sudoku that doesn't contain such a violation may still be wrong if it is not filled entirely. ... This Sudoku as a SVG, png or EPS graphics. Average Solving Time: 675 Seconds.
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sudokugarden.de/en/online/today
sudokugarden.de/en/online/today
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100 difficult Sudoku NR. 2 (PDF). These are extremely difficult. I have more then 30,000 Sudoku and took the 100 most difficult, so give it a try ;-) ... New: 100 difficult Sudoku NR. 3 (PDF). They are number 101 to 200 from a list of demanding Sudokus, continuing NR. 2. Solutions are included.
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sudokugarden.de/en/download-pdf/
sudokugarden.de/en/download-pdf/
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AI Escargot - The Most Difficult Sudoku Puzzle by Arto Inkala: This book contains AI Escargot, the world famous sudoku puzzle which became the most difficult sudoku puzzle known in 2006. There are also several hints for solving AI Escargot in the shortest and most logical way. ... sudoku, puzzle, brain teaser...
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www.lulu.com/content/658756
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This item: 200 Difficult Sudoku Puzzles by Peter Greene ... This book contains 200 difficult Sudoku puzzles, including solutions and clues. All of the puzzles in this book are made by hand and carefully tested to make sure they are difficult but not impossibly so. You should be able to solve one of the puzzles in under...
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www.amazon.co.uk/Difficult-Sudoku-Puzzles-Peter-Greene/...
www.amazon.co.uk/Difficult-Sudoku-Puzzles-Peter-Greene/dp/0955141311
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