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Pages: 172, Paperback, Independently published
Independently Published
World's Hardest Sudoku Book Volume 4: Over 1000 Extreme Puzzles for Elite Solvers
Quick Quoll Sudoku Volume 3: Challenging Puzzles for Seasoned Solvers
Insanities Revenge Hard Sudoku: 120 challenging puzzles for elite puzzle solvers.
Quick Quoll Sudoku Volume 1: Challenging Puzzles for Seasoned Solvers
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