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Title: New York Post Wicked Su Doku: 150 Difficult Puzzles, Author: HarperCollins Publishers Ltd.
Title: Sudoku Junkie: 50 Nearly Impossible Puzzles: Featuring 50 Extremely Hard Sudoku Mind-Benders, Author: Hagopian Institute
Title: The Penguin Sudoku Challenge: Volume 1, Author: David J. Bodycombe
Title: New York Post Shark Su Doku: 150 Fiendish Puzzles, Author: HarperCollins
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Title: Pocket Smart Sudoku: 100 Puzzles, Author: The Puzzle Society
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Title: New York Post Deadly Su Doku: 150 Difficult Puzzles, Author: HarperCollins
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Title: New York Post Toxic Su Doku: 150 Easy to Medium Puzzles, Author: HarperCollins
Title: The Times Ultimate Killer Su Doku Book 3: 120 challenging puzzles from The Times (The Times Su Doku), Author: The Times Mind Games
Title: Revenge of Killer Sudoku 5: 150 puzzles, Author: Dj Ape
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Title: The Times Killer Su Doku Book 8: 150 challenging puzzles from The Times (The Times Su Doku), Author: The Times Mind Games

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