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Are you ready to rise to the ultimate brain-training challenge? If so, Colormazen Very Hard Sudoku Puzzle Book will be your perfect take-anywhere companion. With 100 very hard puzzles guaranteed to sharpen your mind and keep you thoroughly entertained, this collection is a real treat for anyone who loves Sudoku. Working the puzzles in this book can provide a vigorous mental workout for virtually everyone from teenagers to senior citizens, all while fitting within the theme of Sudoku. Included in Colormazen Very Hard Sudoku Puzzle Book - Volume 17 * 100 Very Hard Sudoku Puzzles * All Sudoku solutions at the back of the book. * Printed one per page. * In a large 8.5" x 11" book (21.59 x 27.94 cm). -- And so much more! Activate your brain cells and grab a pencil - Colormazen Very Hard Sudoku Puzzle Book - Volume 17 is here to provide you with hours of challenging entertainment, one page at a time! Buy your copy today