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  1. Killer Sudoku Puzzles by Krazydad

  2. Intermediate Killer Sudoku, Volume 1 - Krazydad Puzzles

  3. Printable Puzzles by KrazyDad

  4. Interactive Killer Sudoku by KrazyDad - Krazydad Puzzles

  5. Play Puzzles by Krazydad - Krazydad Puzzles

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