44 books • 9 series
Book #1: 200 Very Hard Sudoku Puzzles Volume 1
Book #2: 200 Very Hard Sudoku Puzzles Volume 2
Book #1: Easy & Medium Sudoku Puzzles Volume 1
Book #1: Easy Sudoku Puzzle Book Volume 1
Book #2: Easy Sudoku Puzzle Book Volume 2
Book #4: Easy Sudoku Puzzle Book Volume 4
Book #3: Hard Sudoku Puzzle Book Volume 3
Book #4: Hard Sudoku Puzzle Book Volume 4
Book #1: Hard Sukodu Puzzle Book - Volume 1
Book #1: Medium & Hard Sudoku Puzzles Volume 1
Book #1: Medium Sudoku Puzzle Book
Book #2: Medium Sudoku Puzzle Book Volume 2
Book #3: Medium Sudoku Puzzle Book Volume 3
Book #4: Medium Sudoku Puzzle Book Volume 4
Book #1: Very Hard Sudoku Puzzles Volume 1
Book #2: Very Hard Sudoku Puzzles Volume 2
Book #3: Very Hard Sudoku Puzzles Volume 3
Book #4: Very Hard Sudoku Puzzles Volume 4
Book #5: Very Hard Sudoku Puzzles Volume 5
Book #1: Word Search Puzzle Book Volume 1