Sudoku Killer: Killer Sudoku Puzzles for Your iPhone and iPad - YouTube
Killer Sudoku Medium 200 Puzzle WIth Solution Vol 1: Advanced Puzzle Sumdoku Book,9x9, 2 puzzles per page by Tewebook Sumdoku - Paperback - from The Saint Bookstore (SKU: B9781701152304)
Killer Sudoku by Prasanna Seshadri - The Art of Puzzles | The Art of Puzzles
Insane Killer Sudoku
The Times Killer Su Doku: Book 16: The Times Mind Games: 9780008342913: Amazon.com: Books