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.


Welcome to Djape.Net, the website dedicated to providing Sudoku and other puzzles of top quality. Established by Predrag Stanojević (aka Djape), this website has been providing puzzles to numerous publishers around the world since 2005, including The Washington Post, The Washington Express, Le Matin (Switzerland), Compupress (Greece) and other publishers in the UK, France, Finland, Denmark, Sweden and Portugal. Djape has also published more than 40 (and counting!) independent puzzle books which are available for purchase on and other websites. You can also read a brief history of On a more personal note, Djape is from Belgrade, Serbia, has traveled a bit and lived in Australia, USA and South America for a few years. Currently Djape is working on his PhD thesis in Computer Science. Likes sailing, sports in general, playing bridge (the card game) and traveling. Speaks Serbian (and related languages), English and some Italian and Spanish. I am most interested in learning what you think about my website, puzzles and software. Please send all your comments, suggestions and any other feedback to If you are running a brick-and-mortar bookstore and you would like to sell my books, please contact me and I will give you a quote with excellent discounts! If you are interested in publishing my puzzles (including Killer Sudoku, Samurai Sudoku, many different Sudoku variants and also Hanjie (picross, griddlers, pic-a-pix, paint-by-numbers), CalcuDoku, Hidoku , Slitherlink, Hitori, Nurikabe and Kakuro) in your newspaper, magazine or a book, please send an e-mail to


  1. Martin
    Posted January 4, 2012 at 2:17 pm | Permalink

    Happy New Year!

    I hope you aren’t stopping the Killer sudoku on line. It provides a few moments of peace and tranquility (and sometimes on Fridays more than a few) in an otherwise turbulent world.



    • Posted January 5, 2012 at 6:22 am | Permalink

      No, no! I’m not stopping them! In fact, the daily killer sodoku puzzles are back!

      • Martin
        Posted January 10, 2014 at 12:00 pm | Permalink

        It’s the 10th and still nothing since the 5th. R U OK?

  2. Joyce
    Posted February 22, 2012 at 8:48 pm | Permalink

    Are you planning on releasing a second Outside Sudoku book? When might we expect it? Thank you!

    • Posted February 23, 2012 at 2:20 am | Permalink

      Joyce, yes, in fact, now there is a plan to publish another Outside Sudoku book! Would you prefer just plain Outside sudoku puzzles, or another mix of them, like in vol.1?

      Btw, if you liked it so much, would you care to write a review of the Outside Sudoku book on Amazon?

  3. Joyce
    Posted February 24, 2012 at 11:15 am | Permalink

    I personally would like another mix because it makes my brain switch gears on the different types of puzzles and you don’t get bored of the one type of puzzle.

    I did write a review on Amazon which you reprinted on your site! I was the one who wrote I love, love this book and can’t wait for the next one! When can I expect to see it?

    • Posted February 24, 2012 at 12:30 pm | Permalink

      First of all, thanks for the review! πŸ™‚ It means a lot not only to me but to other people who are considering buying a book.

      Volume 2 of Outside Sudoku will be… I can’t say exactly, but most likely in 2-3 months. πŸ™‚ Maybe even sooner!

  4. heather
    Posted April 9, 2012 at 8:25 pm | Permalink

    I look forward to every Sunday for the samurai sudoku in the washington post. But why don’t I ever see a level 5 puzzle published? I keep hoping every week to see one, but I’ve only seen levels 1-4 published although the scale reflects the level of difficulty as 0-5. I’m waiting to be challenged!

    • Posted April 10, 2012 at 12:24 am | Permalink

      Hi Heather, thank you for your comment and for enjoying my puzzles. Usually the puzzles in newspapers are slightly easier than those published in books and here on the website, because they are targeted to a wider audience.

      If you prefer a real challenge, you can find some really difficult puzzles in one of my Samurai Sudoku books. πŸ™‚


  5. shirley
    Posted April 18, 2012 at 6:50 pm | Permalink

    I enjoy doing Samurai Sudoku in the Sunday Washington Post. No matter the
    level I always complete it. However, this past Sunday, April 15, 2012, is only a
    level 2 but is quite challenging. I’ve tried to pull up the solution but have not been
    successful. Can you tell me if the solution has been posted.

  6. Joyce
    Posted June 17, 2012 at 7:52 pm | Permalink

    Is your second outside sudoku book finished? I just completed your first one for the second time! I would rather not buy it again if the second will be out soon! Thanks!

    • Posted June 18, 2012 at 12:52 am | Permalink


      a new book with Outside Sudoku puzzles is in the workings. πŸ™‚

      It should be available for purchase in November. So, it’s up to you if you want to wait or buy another copy of the volume 1.


      • Joyce
        Posted March 23, 2013 at 11:41 am | Permalink

        Finished your Vol. 2 Jigsaw and bought Flower/Outside Sudoku that you recommended. LOVE the book! It’s very challenging which we all love and has a great mix of everything! I think it’s my favorite so far, even more than just the Outside Sudoku! Yes I wrote a review on Amazon. However, there is a print problem I thought you should know about. All the odd/even puzzles on the even (left) pages fade in print to the point that I can’t tell which squares are shaded closest to the binding of the book. Keep up these books cause I’ll be done it in no time! Thanks!

        • Posted March 25, 2013 at 8:43 am | Permalink

          Joyce, I’m so glad you enjoyed the books. Perhaps you could write a review on Amazon? πŸ™‚

          The print problem is probably a single copy problem. In such cases you should contact Amazon and ask them to replace the book (before you start solving it, of course). They take care of the printing and publishing the book and I really can’t help much with that. Try contacting their customer support if it happened again.

  7. Kristin
    Posted August 9, 2012 at 11:22 am | Permalink

    I love your books! I sent you an email before I found this page (should have looked better), but wanted to make sure you received this. I’ve run out of puzzle books that really interest me; most have mostly easy puzzles and then maybe a few good ones. I just finished 2 of your books, and they were the first books of puzzles which challenged me in a long time. I loved them, and just bought several more today. Please don’t stop! You do exactly the types of puzzles I love, & better than anyone I’ve ever come across.

  8. Nigel Cooper
    Posted September 24, 2012 at 5:44 am | Permalink

    You used to do a killer sudoku generator. You removed it but said you would consider publishing it again. I have bought generators from other people but the puzzles are generally too easy. Are you still considering selling a killer sudoku generator?

    • Posted September 24, 2012 at 11:03 am | Permalink

      Hi Nigel,

      Thanks for your interest in my Killer Sudoku generator software.

      Unfortunately, I do not intend to release my generator. If you are interested in purchasing puzzles for a publication, I will be happy to provide a quote.

  9. Tina Harnischfeger
    Posted October 6, 2012 at 8:57 pm | Permalink


    You’ re the best!!! And I’m always looking for new puzzle-books.
    But there is a problem on Amazon to find all Your releases, since a long time!!!
    Always have to search in:
    1. Your DJApe site directly
    2. English Books
    3. Sudokus
    4. Killersudokus
    But whereever,…I never found a complete list -and always sth. new too — on another side. Hidden..!!!
    Have to check all sides the whole time -in cause of that!!!
    I want to inform You!!!
    Better to make it more comfortably…if possible?


    • Posted October 7, 2012 at 3:59 am | Permalink

      Hi Tina,

      It’s strange. You should be able to see all my books on Amazon Deutschland website here:

      Does that work for you?

      • Bettina Harnischfeger
        Posted December 2, 2012 at 5:52 pm | Permalink

        Sorry, forgot to answer…., because…

        … there are no, really nooooo books from you offered on that link!!!!!!!!!!!!!! Tried it there before your answer!!! See only an entrance about your hobbies! Sailing, Bridge, travelling …


  10. Donna Miller
    Posted December 1, 2012 at 2:43 pm | Permalink

    Are those of us who can’t “like” you on facebook going to see the puzzle you put on your site yesterday? The hyper windoku?


    • Tina Harnischfeger
      Posted December 2, 2012 at 6:18 pm | Permalink

      @hyper windoku
      Many thanks for your posting too!!!!
      Made the same entrance like you on the facebook-side!!! But a little bit more “unkindly”. Damned “Like-Button”!!!
      But the following answer now….do you really understand that, uffff???? What a joke!!! Better to buy his books only!!! But Djape asked us before… about the hyper… :o((

      “Ok, once more about the “like” button stuff:
      The daily Killer Sudoku, daily Sudoku variants and weekly Samurai Sudoku puzzles will be available all the time, without the “like” button, except once a week, on Tuesdays. On Tuesdays, it will be as it is now, the puzzles will be available from :00 to :30, but from :31 to :59 there will be a “like” button for you to click in order to access a puzzle.
      The archive will require you to click on the “like” button from :31 to :59. This might change in the future, but in which direction, I don’t know yet.
      Free sample puzzles will also be freely available from :00 to :30 every hour and from :31 to :59 there will be a “like” button.
      This might take a day or two to fix, so please be patient. πŸ™‚ Of course, everyone is still encouraged to click on the like buttons all the time. :)”


  11. Posted August 14, 2014 at 7:25 am | Permalink

    Greetings, Mr. Djape: I just bought Calcudoku for Kids, on speculation for a grandnephew of mine. I hope it don’t give him (nor myself) a headache.

    u have a LOT of twists. Need to be a Rodin (“The Thinker”) do works parts of almost all the puzzles. I have many of your calcudoku books


  12. Posted December 4, 2016 at 2:19 pm | Permalink

    Congratulations on successfully defending your thesis! I know your degree is in CS, but what did you do your thesis on? Did your write it in English, or something else?

    • Posted December 5, 2016 at 2:58 am | Permalink

      Thank you Rick! πŸ™‚ My thesis is on NP-hard location optimization problems. It’s not in English, it’s in Serbian, my mother tongue.

      • Tina
        Posted December 13, 2016 at 4:47 pm | Permalink

        Congratulations on successfully defending your thesis too!!!:o)
        Dr. Djape! ;o))

        But I’m really afraid -and selfish sorry- that you have no time creating Sudokus in the future…

        Stravo Tina

        • Posted December 15, 2016 at 8:06 am | Permalink

          Thank you, Tina! πŸ™‚ Don’t worry, I definitely plan to keep on making sudoku and other puzzles! Probably even more than before!

  13. Tina
    Posted December 15, 2016 at 5:34 pm | Permalink

    That are very good news!:o))
    I wish you a merry christmas and a happy new year!

  14. Christine
    Posted July 19, 2018 at 6:44 am | Permalink

    Hi! I’ve used your samurai sudoke books for years and only just found that you have a website. Do you still publish?

  15. Mark
    Posted October 6, 2018 at 7:34 am | Permalink

    Why does the Samurai Sudoku claim to have a level difficulty range of 0-5 when there are never 0 level puzzles? Shouldn’t the difficulty range be 1-5?

  16. Christina Drees
    Posted December 19, 2018 at 2:09 pm | Permalink

    Hi – just recently bought ‘Picross, Hanjie, Griddlers, Nonograms: 130 Puzzles’ and finished #10.easy puzzle but can’t tell what it is – i’ve asked a few people but no one has any idea. Hoping someone can email me what this picture is of?

    Thank you,

    • Posted December 26, 2018 at 1:42 am | Permalink

      Hi Christina, thank you for your comment and of course thank you for purchasing my book. πŸ™‚

      Puzzle #10 in the book you mention was an experiment. After this book, I published a book of “Random Picross Hanjie Griddlers Nonograms“, which were computer generated. With this puzzle #10 I wanted to see how people would react to a random pattern instead of an image of something. So, no wonder you couldn’t recognize the image, because it doesn’t represent anything. πŸ™‚

      I hope you still enjoyed solving it!


  17. John Albin
    Posted March 23, 2020 at 4:02 pm | Permalink

    LOCO SUDOKU Book #8. What do the BARS over the columns mean. I cannot find the explanation of what they mean so I’m stuck on trying to solve them.

    • Posted May 18, 2020 at 2:05 am | Permalink

      Puzzle #8 is non-consecutive sudoku. In non consecutive sudoku, you must never place two consecutive numbers next to one another, neither horizontally nor vertically. See page 4 of the book.

      The bars themselves do not represent anything particular, except to visually indicate that the puzzle is a non-cons. Without the bars, the puzzle would look just like regular sudoku. So, the bars merely tell you “be careful, this is a non consecutive sudoku puzzle, not a plain old sudoku.”

      I hope this clarifies things. πŸ™‚

  18. Angelika Lange
    Posted May 25, 2020 at 4:57 pm | Permalink

    I bought the first edition of Binary Puzzles. Could you in the next edition please correct the printing mistakes of no 99. 101 and 103,

    • Posted May 26, 2020 at 3:29 am | Permalink

      Could you please be more specific? Which printing mistakes you are referring to?

  19. Drew Henry
    Posted September 5, 2020 at 9:00 pm | Permalink

    My son just finished mighty kakuro and would like another book that is just as hard. Is there another Kakuro book that is as hard?

    • Posted September 14, 2020 at 10:56 pm | Permalink

      Hi Drew, if your son likes hard Sudokus, then I recommend the Difficult Kakuro book. Puzzles are not as big as in the Mighty Kakuro, however, they are very difficult, some even more so than those in the Mighty Kakuro. Here is the link:

      Hope this helps πŸ™‚


  20. James Parnella
    Posted September 24, 2020 at 6:09 pm | Permalink

    My wife just bought another 1000 Number puzzle book from eBay but it’s IDENTICAL to the one she just finished even though it has a different cover and a different ISBN number. What options do we have to replace it?

  21. Vicki Dehlbom
    Posted November 14, 2020 at 6:11 pm | Permalink

    Hello, I purchased your Easy Samurai Suduko book dated 2015. Where can I find the solution to the Trigons puzzle 101?

  22. Merdy
    Posted January 21, 2024 at 2:18 pm | Permalink

    Time to get another Sudoku book and am interested in one that is the most similar to Quirky Sudoku, November 2022, ISBN 979-8-36405-066-3. with 5 Crazy Sudoku Variants. What do you recommend?

    • Posted January 22, 2024 at 4:17 am | Permalink

      Hi Merdy,
      In case you haven’t tried it yet, I recommend the book called Wacky Sudoku.
      If you have also solved that one, then I strongly recommend to wait until May or June this year, when a new book with the same type of puzzles will be released.

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