★ The 2021 Sudoku Puzzle Book For Adults is a collection of Sudoku Puzzles for each day of the year! ✓ Puzzle difficulty varies for each day of the year ensuring you get a daily challenge. This daily sudoku puzzle book for 2021 will keep your mind active. New sudoku puzzle for each day of the year (365 puzzles) 4 difficulty levels ranging from very easy to very hard Random difficulty level each day Large print Sudoku puzzles Bonus x10 Sudoku puzzles