Stimulate your brain with this Extremely Hard 16 x 16 Sudoku Puzzle Book. Become a Sudoku Pro by solving all 50 puzzles in this book. Be careful - Sudoku Books can be addictive. With 50 puzzles included in this book, you will be stimulating your brain for a long time helping to keep you mentally sharp and smart Great pocket size 6" x 9" means it's the perfect size for carrying in your purse, pocket, or backpack. Work your brain anytime,...
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