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Pages: 260, Paperback, Independently published
Independently Published
Difficult Sudoku: 200 puzzles with solutions. Complicated puzzle fun.
600 Sudoku puzzles: 200 easy, medium and difficult with solutions.
CREATESPACE
Difficult Sudoku Book: 200 Puzzles
Challenging Sudoku: 75 Difficult 16x16 Sudoku Puzzles + Complete Solutions
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