A Sudoku Secret to Blow Your Mind - Numberphile

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Our thanks also to the legendary Phistomephel.

NUMBERPHILE

Videos by Brady Haran

Special thanks to these Patrons:
Juan Benet
Matthew Feinberg
Jeff Straathof
Ben Delo
Ken Baron
Andy B
Michael Dunworth
Yana Chernobilsky
James Bissonette
Jubal John
Ben White
Andrei M Burke
RAD Donato
Matthew Schuster
Ron Hochsprung
Ubiquity Ventures
John Zelinka
Gnare
Heather Liu
Ian George Walker
Tracy Parry
Arnas
Bernd Sing
Valentin
Alex Khein
Doug Hoffman
John Loach
Michael Rops

[jasonbraun]

It's so weird to see Simon from a different angle and not sitting in his chair with his guitar in the back. It's almost like he's a real person or something.

[nutmeg-an]

I just need everyone to know that my mailman recommended this video to me

[oddgarrett]

The Phistomephel Ring is a sudoku secret, but not the sudoku secret that Simon only tells his favourite people

[rosiefay]

It's great to see Simon Anthony reveal one of his skills --- not only can he type into his sudoku app (so loudly that we can hear him), he can also write in Numberphile's approved way of marker pens on brown paper.

[Mrsparky]

Was not expecting Simon on numberphile! What a great surprise.

[Wyldina]

I've heard this explanation from this man so many times, and still I watch this video in full for just one more time!

[Fun_maths]

Never in a million years would I think my two favourite channels would collaborate like this, and yet here I am, wonderful!

[namelessminionveinreaver]

Phew, was worried they'd give away the secret here. Still gotta be a friend of Simon and Mark to learn that one.

[tone]

Normally in these situations, it's traditional to say "Wow, I can't believe this crossover!" but this one... this crossover makes a lot of sense. Really cool to see how far the proof on this has come: I've followed CtC for years, and I remember how involved the old versions of this explanation were, but this seems so simple and elegant. Great video!

[SWebster]

I notice that Numberphile viewers don’t get told ‘The Secret’ - he really does save it for his favourite people!

[drillerdev]

I love how elegant and simple the explanation is.

Is one of those things you wouldn't have guessed in a lifetime, but after you've been told, you inmediately think you should have.

[DaShikuXI]

This guy who explained the ring seems pretty clever. He should start his own YouTube channel for this kind of stuff.

[erwinmulder]

Now this a great collab! Love to see Simon featured here. Glad he didn't tell everyone the REAL secret of Sudoku here.

[KombatGod]

Simon explaining the Phistomephel Ring over and over in his videos and really perfecting and honing the explanation... was all leading to this very moment.

[andrewhouchin]

Absolutely love Simon and CTC! What a nice surprise to see him featured on another of my favorite channels!

[johnkloberdanz]

I have been doing sudokus for 20 years, and could never find "the" trick that would get me over the top. I just used this successfully, I think this is it. Thank you!

[Bismuth]

I clicked on this video thinking it was a Cracking the Cryptic video and was shocked to see the classic Numberphile format!

[Vendavalez]

I have seen Simon explain this more times than I can count, and I still listen to it all the way through every single time. There is something magical about it!

[monkeywithawrench]

I love this. I've done sudokus daily for the last 20 years. I particularly enjoy super hard ones where I have to use advanced techniques to solve them. It doesn't happen very often, but it does happen. This needs to be added to the sudoku wiki, wish i would have learned about this a long time ago lol

[MrMMertKorkmaz]

Many people said it already but I have to say it too: I’m extremely happy and pleasantly surprised of this collaboration of my two favorite channels. More Simon & Mark content on Numberphile would be greatly appreciated!