Funster Tons of Sudoku 1,000+ Easy to Hard Puzzles: A bargain bonanza for Sudoku lovers

Sudoku Puzzle Book: The Ultimate Sudoku Challenge - 1000 Puzzles (Vol. 2)

The Largest Sudoku Book in the History of the Universe: 2000 Puzzles with 5 Difficulty Levels

Sudoku Puzzle Book, 600 Puzzles, 300 MEDIUM and 300 HARD: Improve Your Game With This Two Level Book (Sudoku Puzzle Books Champion Series)

500+ Hard Sudoku Puzzles for Adults: Sudoku Puzzle Books Hard (with answers)

Will Shortz Presents The Huge Book of Hard Sudoku: 300 Challenging Puzzles

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Funster 500+ Sudoku Puzzles: Easy, Medium, Hard Sudoku Puzzle Book