Welcome to this superb collection of 100 brand new birthday 9x9 book of sudoku puzzles. Here are the rules of 9 x 9 sudoku: - Place each number from 1 - 9 exactly once in each row, column and 3x3 bold-lined box and the grey 7 and grey 5 in the grid. All of our puzzle books are printed on very high quality paper, making the puzzle experience all the more enjoyable For other puzzle books, visit www.puzzle-book.co.uk
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