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Insane Killer Sudoku

Ok, a few regular readers have requested an INSANE Killer Sudoku puzzle so I had to respond. This puzzle should be very difficult to solve. In fact, it might require some trial&error attempts to be solved. Do not attempt to solve this puzzle unless you are willing to accept that!
(click to download or right-click to save the image!)

Fiendish Killer Sudoku Book

To see the solution to this puzzle click here
This entry was posted in Free sample puzzles, Killer Sudoku and tagged , , , , . Bookmark the permalink. Post a comment or leave a trackback: Trackback URL.


  1. Diana
    Posted April 24, 2007 at 1:40 am | Permalink

    Sorry to disappoint you — the Insane (2308329) was pretty straightforward (but still enjoyable, as always). Don’t know where the trial-and-error would come in.
    Insanes are always appreciated!

  2. Erica Kirby
    Posted April 27, 2007 at 4:38 am | Permalink

    Always enjoy an INSANE (2308329).I did not seem to need the trial-and-error technique. Thanks for a terrific website.

  3. Gwyn Morgan
    Posted April 29, 2007 at 11:22 pm | Permalink

    Insane (2308329): I agree with the comments by Diana and Erica but have to admit it took me three tries because I made the same error in logic the first two times. Thanks for the wonderful series of killer sudoku puzzles.

  4. Stephen J. Herschkorn
    Posted May 2, 2007 at 3:40 am | Permalink

    No trial and error here, either.

  5. Scott Urman
    Posted May 3, 2007 at 10:04 pm | Permalink

    It was a very nice surprise for me to be able to figure this one out without having to guess (although I did check my solution as I went). Great confidence booster! 🙂

  6. Mercedes
    Posted March 30, 2014 at 7:14 am | Permalink

    no more news killers?

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