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Pages: 82, Paperback, Independently published
Independently Published
Sudoku 16x16: The Ultimate Challenge for Advanced Solvers
"Ultimate Samurai Sudoku Challenge: 50 Epic Puzzles for Master Solvers"
Hard Sudoku Challenge: 150 Puzzles for Advanced Solvers
Extreme Sudoku Variants Challenge: Advanced Logic Puzzles for Serious Solvers
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