Killer Sudoku Puzzles Hard for Adults Large Print: Sum Sudoku Puzzle Book with 600 Puzzles for Advanced and Professionals (Sumdoku Puzzle Book): Books & Publishing, Flatline: 9798413587829: Amazon.com: Books
Killer Sudoku Schwer 200 Rätsel Mit Lösung Band3: Anspruchsvolle Summen- Sudoku Puzzle, Rätselheft für Profis, 2 Rästel pro Seite (German Edition): Killer Sudoku, Tewebook: 9781696099288: Amazon.com: Books
1000+ Killer Sudoku Puzzles: Sudoku puzzle book for adults, Sudoku Puzzles with Solutions, Tons of Challenge for your Brain: PSB: 9798528346618: Amazon.com: Books
Killer Sudoku Adventures: 500 Sum Sudoku puzzles for adults (easy to hard): SomatoMint: 9798645278113: Amazon.com: Books
400+ Killer Sudoku Puzzles: Challenging Sum Sudoku puzzles for adults (Killer-doku): PuzzPond Designs: 9798633723571: Amazon.com: Books