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Clueless Sudoku

Here is another Sudoku overlapping puzzle variation. As far as I know, it was invented by Ruud from – please correct me if I’m wrong. So I thought I should give it a go at creating one such puzzle – and of course I had to add something to it. So, my variation is Clueless X. There are 9 classic Sudoku X puzzles with no overlapping regions! If you attempt to solve them individually – you won’t get far: none of those 9 puzzles has a unique solution. Here is where the “clueless” part comes in: in all of those 9 puzzles, the center nonet has no starting clues. As you plug in your numbers, center nonets (shaded in grey) start filling up. The trick is that those 9 center nonets, put together, also constitute a valid Sudoku X puzzle. So, when you run out of ideas, start working on the 10th puzzle and it will give you enough information to solve the whole lot. Those 10 puzzles together have, of course, a single solution. Clueless Sudoku X for Thursday, April 6 – this is the only place you can find these kind of Sudoku puzzles!
(click to download or right-click to save the image!)

Samarai Sudoku book

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


  1. amy
    Posted April 15, 2006 at 6:01 am | Permalink

    I enjoyed this one. Thanks! Always looking forward to something new.

  2. Mike
    Posted April 17, 2006 at 3:44 am | Permalink

    I haven’t tried to solve this yet but…Does the 10th puzzle also have the properties of X?

  3. Posted October 31, 2013 at 10:52 am | Permalink

    Hi im looking around for this clueless sudoku from website.however i can’t locate which puzzle book it was in.
    could you kindly help to find me find the name of this puzzlebook so i can buy them.Thanks very much

    • Posted October 31, 2013 at 1:38 pm | Permalink

      Christy, there is no such book with only Clueless Sudoku puzzles.

      There is one in the Sudoku variations book, if that’s what you were looking for.

      Perhaps I will publish a book of clueless sudokus only? Hmmm… 🙂

3 Trackbacks

  • By Daily Killer Sudoku, Samurai and more » on April 10, 2006 at 10:25 am

    […] I promised something special with the Clueless concept before – and here it is: my first ever Clueless Killer Sudoku puzzle. Again, thanks to Ruud from for inventing the “clueless” concept. […]

  • By Extra special – Clueless Zero Killer Sudoku on February 17, 2012 at 2:35 am

    […] I would first suggest to try and solve some earlier puzzles of this sort. Here is a link to Clueless Sudoku X and here is a link to Clueless Killer […]

  • By Clueless LOCO Sudoku on October 7, 2017 at 9:13 am

    […] you try solving this puzzle, please become familiar with the Clueless Sudoku puzzles and with the Loco Sudoku puzzles, […]

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