946 books • 127 series
Book #1: Sudoku 8x8 - 200 Easy Puzzles vol.1
Book #3: Sudoku 8x8 - 200 Hard Puzzles vol.3
Book #2: Sudoku X - 200 Medium Puzzles Vol.2
Book #3: Sudoku X - 200 Hard Puzzles Vol.3
Book #4: Sudoku X - 200 Expert Puzzles Vol.4
Book #12: A Just Society?
Book #7: They Were First