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.


Are you ready for a SERIOUS puzzle challenge? 🙂 These puzzles have been around for a while and they somewhat resemble Tridoku, both in their appearance and in their name. However, trigons are completely different. These puzzles with lots of triangles are called Trigons and they are not Sudoku. Sometimes they are also referred to as Trianglons. They have something in common with Killer Sudoku, because you are dealing with sums of numbers.

The rules of Trigons are:

1. Use digits 0 to 6 to solve the puzzle. 2. The numbers given in the puzzle represent the sum of the three digits on the side of the corresponding triangle. 3. Your objective of course is to match those sums. 4. Numbers CAN BE repeated in one triangle. 5. Each sum combination MUST BE USED ONCE and not more than once. All triangle sum combinations are given below the grid so when you use one, cross it off. I will soon start posting tips on how to solve trigons. Basically, start with the 0 and the 18 and then analyze which sum combination can go where depending on the neighboring sums. DO NOT GUESS! Look for two adjacent sums which differ by a large number – the possibilities are usually very limited. And don’t guess, please! 🙂 Trigons come in different shapes and sizes and if you have a particular shape which you prefer, please let me know.

Free Trigons Puzzle – difficulty UNKNOWN

(click to download or right-click to save the image!)

Big book of big Trigons triangular sudoku trianglons puzzles

To see the solution to this puzzle click here
Please help me determine the difficulty. Have I overdone it again?
This entry was posted in Free sample puzzles, Killer Sudoku, Puzzle variants and tagged , , , , . Bookmark the permalink. Post a comment or leave a trackback: Trackback URL.


  1. Tina
    Posted April 5, 2015 at 4:22 pm | Permalink

    Wow, what a fantastic idea! Many thanks for this Easter Present
    – a “Golden Egg”!!!
    You’re right! That’s much more important than any “Strike Sudoku” and it’s a puzzle for Killerfans too. ;o))
    First I didn’t like Tridokus. Thought they are boring. Then I bought your Tridoku- books, in cause I needed new stuff from you urgently. Solved all other books before… ;o)
    Since this time I love Tridokus.
    It’s a complete new dimension for my “Sudoku-brain”. And much more inspiring than a tridimensional “Cube” at masterships.
    Always hoped someone could create a Multi-Tridoku-Variant. But it’s impossible to be “handmade”! You found the algorithm now!:o))

    During the holidays I have less time…
    Waiting impatiently to solve it….



    • Posted April 6, 2015 at 2:01 am | Permalink

      And what did you think of the puzzle? Have you solved it?

  2. Enrico
    Posted April 6, 2015 at 6:21 am | Permalink

    Great puzzle! Quite difficult but not too much!
    I just calculated that with all ten digits (0 to 9) there will be 220 combinations. Good work, djape…… ;-)))

    • Posted April 6, 2015 at 8:29 am | Permalink

      I’m so glad you liked it Enrico! Have you played trigons before? If yes, which shape do you prefer?

      Keep coming and there will be more of them! 🙂


      • Enrico
        Posted April 6, 2015 at 9:36 am | Permalink

        Ooops… I thought that you’d invented this kind of game…!
        I had never seen before!
        Do you think it possible the version with ten digits?


        • Posted April 6, 2015 at 1:01 pm | Permalink

          It is possible and I am working on it. But it is going to be very tough! 🙂

  3. Posted April 25, 2015 at 6:30 pm | Permalink

    I thought it was a fun puzzle. Took me a few hours, with some tough spots and some not so tough spots. I haven’t done any of your puzzles for a while so I’m rusty!

  4. Posted June 4, 2015 at 10:33 am | Permalink

    Trigons are among my favorite puzzles. Thank you for putting a couple of them out there! I’m still working through them, but so far, finding it very satisfying!

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