This is the archive of the old posts from Djape .Net, more or less as they used to be. Please go to to see the new website.

Sequential Sudoku

Here is another very special Sudoku puzzle. In fact, it’s not only one puzzle but rather six of them, although you cannot solve them separately. Instead, you must solve them in the given sequence, because in order to solve a puzzle, you must copy a few numbers from the previous one. So, the first puzzle is a classic Sudoku, but then when you go to the second one, you check which cells are shaded in grey in the second puzzle and then copy the numbers from the 1st puzzle solution from the same spot. I hope it’s clear enough. This is an existing concept, but I added a little twist to it. All six puzzles that you will find here have special “shapes” in them, so they really tell a little story. You must use your imagination, but here is my suggestion for this set:
1. You start with a game of chess 2. If you win, you get a chance to make a lot of money 3. So you set on a journey, but first, must find your way out of a maze 4. Which takes you to the stars 5. Where there’s stars, there’s black holes – you must avoid them 6. And finally, to return home you have to find an exit through a “wormhole”
Enough talk. Here is the puzzle It’s a PDF file, so you need Acrobat Reader to view it and print it. Let me know how you like it!
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  1. Daninspain
    Posted November 8, 2005 at 11:58 am | Permalink

    Looks like fun but none of the squares are shaded. An oversight or my eyesight?

  2. Posted November 8, 2005 at 12:40 pm | Permalink

    Daninspain, there are definitely some shaded cells in the puzzles 2-6. There are no shaded squares in the puzzle number 1. Don’t know what the problem is.

  3. Daninspain
    Posted November 8, 2005 at 1:47 pm | Permalink

    In my Acrobat Reader v. 5.1.0 there are definitely no shaded squares in any puzzle. I can e-mail you a screenshot if you like.

  4. udosuk
    Posted November 8, 2005 at 3:36 pm | Permalink

    I use Acrobat Reader 7.0.5 and it’s working perfectly. It’s a great set of puzzles… also when I tried to use my sudoku solver to solve the last (6th) stage it kept telling me I’m using invalid moves (because the puzzle is a diagonal X) and has multiple solution in normal sense. So at the end I solved it with 35 “invalid moves”. Hilarious! Keep up the great work DJ!

  5. Posted November 8, 2005 at 8:55 pm | Permalink

    Thanx for your kind words udosuk.

    I just want to clarify something for other visitors:
    1. Puzzles 1-5 are classic Sudoku and of course they only have one solution (when you copy the missing numbers).
    2. Puzzle 6 is a Sudoku X and it has only ONE diagonal solution. It has other solutions but they are not diagonal. You are looking of course for the diagonal one :).

    By the way, the first puzzle is extremely easy, but they get harder and harder, finishing with the diagonal which is quite difficult to solve (I think).

  6. Posted November 8, 2005 at 9:41 pm | Permalink

    Really amazing the sequential sudoku, it kept me on the sofa for some time… 😉
    two notes:
    1) It is possible, sometimes, to ‘reverse engineer’ the numbers, I mean, looking to the fifth sudoku (9th nonet) it could give clues for the previous one (same nineth nonet);
    2) If I solved it all right, you put in the first Sequential three cells containing two number 2 (last sudoku, on the right, the numbers are 1,2,2) will this be possible from now on, I mean, will it go against the killer rules ? It’s just a curiosity, since here there is not any problem in having two numbers in the same “cage”…

    Thanks again for your good work!!

  7. Cathy
    Posted November 8, 2005 at 11:42 pm | Permalink

    Great idea – could we have the puzzles set a bit bigger though, or the option to print, say, two to a page, not much room for candidates!!

  8. udosuk
    Posted November 9, 2005 at 6:49 am | Permalink

    Cathy, I don’t know if your version could do that, but in AR7.0.5 you could actually copy and paste each grid as an image to a program, say Paint or Word. In there you could zoom up and print them separately, or print 2 or more of them on a page if you like…

    Also I can’t see why teostress has associated the shaded area to the cages in killer puzzles… they’re totally irrelevant?

  9. cara
    Posted November 10, 2005 at 1:41 am | Permalink

    This was a great puzzle, as are your Killers. Any chance you could post more than 5 days of Killer archives? I just found the site a couple weeks ago and would love to be able to do the older ones I missed.

  10. Posted November 10, 2005 at 8:50 am | Permalink

    Thanks for the compliments cara.

    At the moment we are not planning to put more puzzles in the archive. But everyday you will find a new puzzle on these pages, so don’t worry about the old ones :).


  11. Lazee
    Posted November 17, 2005 at 3:09 pm | Permalink

    Well, I got through the first 5 puzzles successfully… only to be totally baffled by the last one. I’ve never done a puzzle with the X through it and am having a lot of trouble solving it – any tips?

    Other than that though, I really enjoyed the sequential concept – lots of fun!

  12. Posted November 17, 2005 at 3:15 pm | Permalink

    Lazee, the “X” in the puzzle means that the puzzle must have all numbers 1-9 on both diagonals, just like any row, column or nonet.

    So you can pretty much apply the same rules for the diagonals when you’re eliminating candidates.

    Hope this helps.

  13. manek
    Posted April 30, 2006 at 9:56 pm | Permalink

    I’ve only just discovered this puzzle on your site and have searched in vain for another!!! Could we please have some more?
    Congrats on some great puzzles!

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