Killer Sudoku From Scratch - Puzzle Genius

Killer Sudoku Puzzles by Krazydad

Killer Sudoku by Sudoku.com - Apps on Google Play

Killer Sudoku - Play it Online at Coolmath Games

Killer Sudoku - Hard

Medium Killer Sudoku: Medium Killer Sudoku : 250 Sum Sudoku Puzzles for Adults (Series #1) (Paperback)

The Rule of 45 of Killer Sudoku (innies and outies)

Interactive Killer Sudoku by KrazyDad

Killer Sudoku Hard To Extreme Puzzles - By Senor Sudoku (paperback) : Target

1,000 + New sudoku killer 10x10: Logic puzzles extreme levels (Paperback)

Killer Sudoku by Sudoku.com on the App Store