This Sudoku Has No Digits At All!

Phistomefel has produced this, at first sight baffling, killer sudoku - can you find x?! Try the puzzle here:

Rules:
Normal sudoku rules apply. Digits may not repeat within a cage. There exists a two-digit number x, such that the digits in each cage add up to a multiple of x. The number x is the same for each cage and has to be determined first.

The puzzle appeared on Logic Masters Germany here:

Our upcoming app is called Miracle Sudoku:

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The solution video for our Sudoku Hunt is also now available for all $3 patrons and above. Congratulations to the 260+ solvers who have completed the hunt correctly!

You can become a patron here:

Joke van Veenendaal's new puzzle hunt is also available free at our patreon page above.

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Our Chess Sudoku App has just been updated to include lots of Queen Sudoku puzzles! Do update your app to access these puzzles :)

Our Sandwich Sudoku App has just been updated to allow users to transfer data between different devices! This update is coming later this month for Classic Sudoku, Chess Sudoku and Thermo Sudoku!

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▶SOFTWARE◀
Play the puzzle in the video by clicking the link under the video (above). We are building a website which will allow you to enter your own sudoku puzzles into the software and this is coming soon!

▶Logo Design◀
Melvyn Mainini

▶ABOUT US◀
Hi! We're Simon Anthony and Mark Goodliffe, two of the UK's most enthusiastic puzzle solvers. We have both represented the UK at the World Sudoku Championships and the World Puzzle Championships. We're also "cryptic crossword" aficionados. Mark is the twelve-time winner of The Times championship and Simon is the former record holder for most consecutive correct solutions to The Listener crossword. We hope we can help your puzzle solving while also introducing you to some of the world's best puzzles.

Thank you for watching!
Simon and Mark

[xXluckyjoeXx]

I feel simon would be amazing at putting together a wedding table roster where both sides of the families hate one another

[craigspaulding]

Next time: the sudoku is completely full, but the rules are blank and need to figured out

[aok_]

Simon: ... because look.
Me: Oh I'm looking alright, Simon I'm looking. But the numbers, Simon, the numbers. What do they mean!?

[nstyle]

Next time: "No numbers, no lines, no markings of any sort, it's just a white page"

[peterjohnclayton]

Simon's Brain: I shall solve the impossible.

Simon's fingers: Ima gonna hit the wrong keys everytime I type a number.

[bevstarrunner]

"We'll have to resort to regular Sudoku" - Simon seemed so disappointed.. lol

[robharris]

this guy reeling out logical deductions like they're nothing, then gets stuck on whether 180 is 15x12 lol

[evah]

It's honestly adorable how big a nerd crush Simon has on Phistomephel!

[leyah]

i love it whenever he tells us that -2 or 11 is impossible to fill in
thank you simon

[jazzyjbomb]

who else just found this dude and has been bingwatching

[MrHO]

"Ah, if it's got an eight in it then that's got to be a two and this would have to be a one-eight pair."
Me: I'll take your word for it.

[Valor]

Every 'because look' makes me smile. Thank you for giving my stressed brain a nice place to relax with a good puzzle.

[lukasaurelius]

Given digits: 0... minutes in video: 45... number of attempts I’ll be giving: zero. Daily CTC video: Priceless.

[alvaropallete]

29:35 "but that cage, I can color it in blue, this makes me feel better, I'm gonna do it"
*me coloring every cell so I can feel better

[facilvenir]

I like how your voice gets a little bit higher when you're excited about the solve. It shows how much you love solving puzzles.

[bluepyro]

Out here willingly ruining my sleeping schedule watching something I barely understand, but wow do I enjoy it.

[mrdooman]

This was recommended. Even watching it with him explaining it, I have no clue what's going on.

And yet I still watched the whole thing. I think because of his enthusiasm/joy.

[lancheair]

Simon this is for you and Mark. There is no way I can write this with any sort of ease I am just going to spill out words and hope you get my true meaning in the end. ( i am holding back my own emotions as I type this) My 10yo son came to the realization (many months ago) that life will eventually end and we will no longer be on this earth. For the past half year or so he and I have tried to find things that take away that unfortunate end for us all. Reading, riding his bike, exercising, movies, tv, board games, computer or ipad games among others. Many of which help for that moment and none seem to stick without having a conversation again mixed with some crying. We found your channel almost 7 months ago and the feature for us to try the puzzles before you, or we just watch each of your videos together as you solve the puzzles I still have no chance at but love both of your reactions/logic and similar frustrations as we have, as you go through the puzzles. Its been a few weeks and he and I still get together when I am done with work thinking about what wonders await us on the channel. Simon and Mark I dont know if I consider you guardian angels without knowing it or just a couple of guys who love puzzles as much as I do. You have truly taken this man and his son on a ride that he and I will never forget. You and Mark do more than just solve puzzles. I have no real ending to put this at an end, i need to go clean my face and hug my kids again. <Father of four, lifetime follower of your channel. Matt>

[nimbletim]

anything that takes simon 25+mins, i don't dare try.

[azazelbuzz]

I'm back down this rabbit hole, aren't I? These videos have some strangely fascinating quality to them.