42 books • 22 series
Book #2: Crossword Easy sudoku Activity books for adults
Book #4: Crossword Sudoku puzzles books
Book #8: Easy Sudoku and crossword activity books
Book #10: Crossword Sudoku activity books
Book #12: Crossword and Word Search Activity books
Book #1: Easy Sudoku Puzzle Book
Book #3: Easy Sudoku Puzzles
Book #4: Easy Sudoku Puzzle
Book #7: Easy Puzzles Sudoku Large Print
Book #8: Sudoku Easy Puzzles