511 books • 54 series
Master of Puzzles - Killer Sudoku 400 Easy to Master Puzzles 10x10 Vol. 20 (Killer Sudoku, #20)
Master of Puzzles - Killer Sudoku 200 Master Puzzles 10x10 Vol. 18 (Killer Sudoku, #18)
Master of Puzzles - 200 Consecutive Sudoku Hard to Master Puzzles Vol.6 (Consecutive Sudoku, #6)
Master of Puzzles - 200 Consecutive Sudoku Easy to Medium Puzzles Vol.5 (Consecutive Sudoku, #5)
Master of Puzzles - 400 Consecutive Sudoku Easy to Medium Puzzles Vol.7 (Consecutive Sudoku, #7)
Master of Puzzles - 400 Consecutive Sudoku Hard to Master Puzzles Vol.8 (Consecutive Sudoku, #8)