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Pages: 307, Paperback, Independently published
Independently Published
144 Hard Sudoku Puzzles: Challenging Logic Puzzles for Experienced Solvers
Dragondoku 120 Sudoku Puzzles: Hard & Very Hard: Puzzles for Experts and Advanced Solvers
Hard Sudoku Puzzles: Puzzles For Experienced Solvers 8.5x11 200 Pages 800
Killer Sudoku: 230 Medium to Hard Logic Puzzles for Experienced Solvers
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