90 books • 12 series
Book #1: Easy Sudoku Puzzle Book Volume 1
Book #2: Easy Sudoku Puzzle Book Volume 2
Book #5: Easy Sudoku Puzzle Book Volume 5
Book #8: Easy Sudoku Puzzle Book Volume 8
Book #19: Easy Sudoku Puzzle Book Volume 19
Book #1: Hard Sudoku Puzzle Book
Book #2: Hard Sudoku Puzzle Book Volume 2
Book #5: Hard Sudoku Puzzle Book Volume 5
Book #7: Hard Sudoku Puzzle Book Volume 7
Book #8: Hard Sudoku Puzzle Book Volume 8
Book #1: Sudoku Pocket Puzzle Book
Book #2: Sudoku Pocket Puzzle Book 2
Book #3: Sudoku Pocket Puzzle Book Volume 3
Book #4: Sudoku Pocket Puzzle Book Volume 4
Book #5: Sudoku Pocket Puzzle Book Volume 5
Book #6: Sudoku Pocket Puzzle Book Volume 6
Book #7: Sudoku Pocket Puzzle Book Volume 7
Book #6: Sudoku Puzzle Book Volume 6
Book #9: Sudoku Puzzle Book Volume 9
Book #11: Sudoku Puzzle Book Volume 11
Book #12: Sudoku Puzzle Book Volume 12
Book #21: Sudoku Puzzle Book Volume 21
Book #3: Sudoku Summer Puzzle Book Volume 3
Book #6: Sudoku Summer Puzzle Book Volume 6
Book #8: Sudoku Summer Puzzle Book Volume 8
Book #9: Sudoku Summer Puzzle Book Volume 9
Book #12: Sudoku Summer Puzzle Book Volume 12
Book #1: Summer Sudoku Puzzle Book Volume 1
Book #2: Summer Sudoku Puzzle Book Volume 2
Book #17: Very Hard Sudoku Puzzle Book Volume 17