Happy Birthday Mother Sudoku Activity Puzzle Book Place a number in each empty box so that each row, column and nine-box square contains the numbers 1 to 9. Hard, medium and easy puzzles are included. Customized activity puzzle books speak to their recipients on a more personal level, making them feel special. Plus, activity puzzle books are universally functional gifts, for both kids and adults. It is proven that puzzles are a great way...
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