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  1. Killer Sudoku Puzzles by Krazydad

  2. Challenging Killer Sudoku, Volume 1 - Krazydad Puzzles

  3. Super-Tough Sudoku Puzzles, 4-per-page, Volume 1 - KrazyDad

  4. Play Puzzles by KrazyDad

  5. Killer Sudoku online - Solve daily killer sudoku puzzles