Book: Will Shortz Presents The Huge Book of Hard Sudoku: 300 Challenging Puzzles - St. Martin's Griffin
Book: Sudoku 3: 200 Puzzles: Hard to Extreme - Chronicle Books
Book: Hard Sudoku Book: 200 Difficult Sudoku Puzzles (Volume 1) - CreateSpace Independent Publishing Platform
Book: Beyond Black Belt Sudoku: If you have to ask, its too hard for you. (Martial Arts Puzzles Series) - Puzzlewright
Book: The Must Have 2015 Sudoku Puzzle Book: 365 puzzle daily sudoku to challenge you every day of the year. 365 Sudoku Puzzles - 5 difficulty levels (easy to hard) - Buysudokubooks.com
Book: Will Shortz Presents Ferocious Sudoku: 200 Hard Puzzles - St. Martin's Griffin
Book: Will Shortz Presents Surrender to Sudoku: 200 Irresistibly Hard Puzzles - St. Martin's Griffin
Book: Will Shortz Presents The Little Luxe Book of Sudoku: 335 Easy to Hard Puzzles - St. Martin's Griffin
Book: SUDOKU Puzzles - Hard to Very Hard: Puzzles + Solutions - CreateSpace Independent Publishing Platform
Book: Will Shortz Presents Survival of the Fittest Sudoku: 200 Hard Puzzles - St. Martin's Griffin
Book: Will Shortz Presents Trickiest Sudoku: 200 Very Hard Puzzles - St. Martin's Griffin
Book: Will Shortz Presents Serious Sudoku: 200 Hard Puzzles - St. Martin's Griffin
Book: Absolutely Nasty Sudoku Level 4 - Puzzlewright
Book: Sudoku Genius: 144 of the Most Fiendish Puzzles Ever Devised - Plume
Book: Sudoku 2: Medium to Hard - Chronicle Books
Book: Will Shortz Presents Deadly Sudoku: 200 Hard Puzzles - St. Martin's Griffin
Book: Large Print Sudoku: 200 Medium to Hard Level Puzzles (Volume 2) - CreateSpace Independent Publishing Platform
Book: The New York Times Delightfully Difficult Crosswords: 150 Hard Puzzles - St. Martin's Griffin
Book: Will Shortz Presents Tis the Season Sudoku: 335 Easy to Hard Puzzles - St. Martin's Griffin
Book: The New York Times Ferocious Crosswords: 150 Hard Puzzles (New York Times Crossword Puzzles) - St. Martin's Griffin
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Sudoku Puzzle Books Hard Popular Q&A
Q: What is the best hard Sudoku puzzle book you've found?
A: There's a couple advanced books that I'd recommend, "Sudoku Genius: 144 of the Most Fiendish Puzzles Ever Devised" http://www.amazon.com/Grand-Master-Ultim…. "N... Read More »
Q: How to Solve Very Hard Sudoku Puzzles.
A: 1. Identify rows that have all but one block filled in. 2. Enter the only available number, eliminating it as a possibility for other blocks and rows. 3. Move o... Read More »
Q: How to solve Hard Sudoku puzzles showing step by step method?
A: Pick one, put the link to the one you want to solve in this answer, and I'll run through the solution for you. Read More »
Q: Help with hard sudoku puzzles?
A: Unfortunately the link doesn't work. Can you just write the numbers like this: Row 1: 2 _ 8 _ _ _ _ _ 1 Row 2: _ 1 _ _ _ _ _ _ _ Row 3: etc etc Row 4: etc etc I... Read More »