34 books • 3 series
Sudoku Legends' League
Daily Sudoku Challenge
Sudoku Brain Games
Sudoku Super Fan
Sudoku Made Easy
I Love Sudoku
Sudoku is Awesome
Sudoku Heaven
How Sudoku Grandmasters solve hard puzzles
Is Artificial Intelligence Smarter than a Fifth Grader? You Be The Detective! (Artificial Intelligence Stories, #1)