Solve The Whole Sudoku With A Simple Trick!

** ROLLER COASTER NURIKABE by the_cogito **
Simon's 2.5 hour solve of Roller Coaster Nurikabe by the_cogito is now available on Patreon. Check the puzzle out at the link below:
logic-masters.de/Raetselporta...
Join us on Patreon (for as little as $2):
/ crackingthecryptic
** TODAY'S PUZZLE **
Simon reveals one of his favourite types of puzzle today in having a crack at Tulpenblüte by Myxo. We're not sure how much to write about this sudoku: suffice it to say that if we ever make another book, this one needs to be in it.
Play the puzzle at the following link:
sudokupad.app/ori9jgdrak
Rules:
Normal sudoku rules apply. Digits along a thick magenta line form a consecutive sequence without repeats, in any order. Digits connected by a thin green line must differ by at least 5.
You can watch us in the latest @numberphile video here:
• A Sudoku Secret to Blo...
If you'd like to see Simon's solve of TotallyNormalCat's Broken Secrets on the main channel, drop a comment and let us know.
** OUR JANUARY COMPETITION & SIMON'S BONUS SOLVES **
Our January Patreon reward has just been published: All The Fun Of The Fair featuring sudokus themed around fairground rides!
There's also Mark's latest battle with The Times' Club Monthly Special cryptic crossword.
Join us on Patreon (for as little as $2):
/ crackingthecryptic
** KICKSTARTER - DELIVERED 24 December 2023 **
Our Kickstarter has finished and we've created the finished novella/puzzle collection for you. It was delivered on Christmas Eve so check your inboxes!
www.kickstarter.com/projects/...
** ORDER OUR NEW BOOK AT THIS LINK **
If you would like to get hold of a physical copy of our new book, Cracking The Cryptic's Greatest Hits - Volume 2, there is still a chance. Visit the link below:
bean-games.pledgemanager.com/...
▶ SUDOKU PAD - Use Our Software For Your Puzzles ◀
You can input classic sudoku puzzles into our software and help support Sven, the programmer responsible for the wonderful user interface we all use to play these puzzles everyday. The app also comes with 12 handmade puzzles from us:
iOS:
apps.apple.com/us/app/svens-s...
Steam: store.steampowered.com/app/17...
Android:
play.google.com/store/apps/de...
ALSO on Amazon: Search for “SudokuPad”
▶ Contents Of This Video ◀
0:00 Theme music & Puzzle intro
1:46 CtC debuts on Numberphile
2:16 CtC Greatest Hit Book 2 DELIVERIES!
2:36 Simon's 2.5hour solve of Roller Coaster Nurikabe
3:49 Happy Birthday Simon & Wasp Story
5:38 Rules
7:02 Start of Solve: Let's Get Cracking
▶ Contact Us ◀
Twitter: @Cracking The Cryptic
email: [e-mail]
Our PO Box address:
Simon Anthony & Mark Goodliffe
Box 102
56 Gloucester Road
London
SW7 4UB
(Please note to use our real names rather than 'Cracking The Cryptic'.)
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We also post the Wordle In A Minute videos on TikTok.

[@kn1tt3r]

The way Simon resolved the 16 pair and later the 34 pair is one of the most fascinating things I've ever seen. It's like realizing you are allowed to walk at a green traffic light by finding no red lights anywhere.

[@AngryKettle]

Simon playing sudoku is lava as usual ;)

[@Travis_Varga]

Yes, that was convoluted even for him.

[@toxicara]

How dare they make him do Sudoku a mere 19 minutes into this Sudoku puzzle!?

[@istvanmagi473]

19:02 Simon's brain refuses to do simple sudoku again, instead comes up with a convoluted reasoning to reach the same goal. Then he repeats it again, then goes on to praise the puzzle's creator how uniquely beautiful and elegant this logic is.

[@TheTongo11]

Yes I love when Simon forget that normal sudoku rules applies and still finds a solution.

[@chuckdecker3765]

Yeah to me the praise really rings hollow when it's due to him being a complete numpty and missing something so blindingly obvious. Kind of takes away from the puzzle and its constructor when it's complimented for being so genius when in reality... it's basic sudoku that Simon is just ignoring.

[@emilywilliams3237]

Praise sincerely meant is never hollow. Simon prefers the logical beauty to the simpler path - and so for him, to praise a puzzle's beauty and elegance is the highest praise possible. It is entirely sincere.@@chuckdecker3765

[@looweeg4229]

Except that he get's there while most of us would probably be clueless on how to even start the puzzle. So can't blame him for puttting his brain in overdrive and having a hard time coming back from it.

[@peterhowitt3861]

You beat me to it. He does it all the time.

[@patrickgass787]

Myxo's puzzles are always so understated in their beauty. They're never flashy or garish but they're always deeply, deeply satisfying to solve.

[@kevinthurlow8055]

I got the book today and eventually solved the first problem - how to get it out of the package. In retrospect, I should have filmed it and put it on KZbin! In fairness, the packaging was brilliant and the book in perfect condition after its long journey. After I have recovered, I will attempt the real puzzles...

[@davidrattner9]

Great puzzle to solve from you Simon!! Please feel free to post your longer solves here on the channel! There is an ABSOLUTE community that will watch 2 and half , 3 hours of you battling with a puzzle.

[@LorisLaboratory]

I just got my package of your two books and bobbins cushion and love them!! Thanks guys, great stuff 😸🥰

[@tillajay]

Love this solve, very satisfying. Do continue to keep showing the 'easier' (quicker) puzzles Simon, for those of use who need a cracking the cryptic fix in our lunch break, the 1 and 2 hours ones are just too much! 😊

[@listey]

Absolutely love the longer videos as long as the rules are straightforward enough to understand.

[@anaayoung9142]

Simply lovely sudoku. You find the key almost in a second! What a brilliance. I started watching your solve, than I tried after the break-in. It was a "simple deduction" but I was not able to do alone 😅 So thanks for the solve Simon! 😊

[@ettoremanca9538]

Hi Simon! Personally I love when you upload “incredibly” long videos… don’t be nervous to make more 😊

[@57thorns]

unfortunately many people do not have time to watch those, and than the algorithm decides to punish the channel for the lower viewer retention by reducing the number of exposure by several thousand also for the shorter videos that follows. So they can't really do that too often. A few time per year perhaps? I suspect the several shorter (a few years ago a 30 minute video would be considered long, not anymore) videos lately is to appease the algorithm to regain views.

[@mastercreative6752]

I would absolutely love to see "Broken Secrets" on the channel, the extremely long solves are always my favourites!

[@thejadesilly]

I would love to see the longer videos on the main channel! I understand having patreon get dibs first, but I love ctc videos no matter the length!

[@emilywilliams3237]

I gave this puzzle a try on my own and got pretty far with it, thanks to all of the instruction and demonstration that you and Mark have given over the time I have been watching you guys! What a lovely puzzle, and what a beautiful solve. I loved every moment of it, Simon. Thank you.

[@davidrattner9]

They are such immaculate teachers!! How they deduce and explain everything is such a learning experience!

[@emilywilliams3237]

I have learned so much, and had such a good time all the while!@@davidrattner9

[@inspiringsand123]

Rules: 05:43 Let's Get Cracking: 07:10 What about this video's Top Tier Simarkisms?! The Secret: 6x (01:24, 03:09, 07:47, 07:53, 07:56, 15:54) Three In the Corner: 2x (24:59, 33:02) Phistomefel: 2x (01:19, 02:07) Bobbins: 1x (02:27) And how about this video's Simarkisms?! Beautiful: 13x (00:34, 01:15, 10:33, 10:59, 12:01, 16:13, 19:53, 20:05, 24:13, 24:52, 32:56, 37:49, 40:06) Hang On: 8x (15:49, 15:49, 15:49, 21:15, 24:01, 24:01, 28:02, 31:28) By Sudoku: 6x (15:40, 27:29, 32:34, 33:34, 35:00, 35:38) Hypothecate: 5x (21:07, 21:49, 24:39, 26:44, 29:42) Ah: 5x (23:35, 27:51, 28:56, 34:27, 37:25) Nature: 5x (07:43, 14:21, 31:42, 36:50, 39:36) Lovely: 4x (16:18, 16:24, 24:51, 35:55) In Fact: 4x (08:38, 17:23, 17:42, 18:42) Sorry: 3x (17:30, 35:33, 37:33) Clever: 3x (15:07, 31:18, 31:18) Pencil Mark/mark: 3x (10:40, 27:51, 35:29) Brilliant: 2x (39:09, 39:09) Fascinating: 2x (15:10, 24:20) Incredible: 2x (02:11, 02:11) Elegant: 2x (19:59, 20:01) Weird: 2x (10:37, 30:07) What a Puzzle: 1x (39:09) The Answer is: 1x (32:46) In the Spotlight: 1x (25:04) Gorgeous: 1x (38:53) Surely: 1x (27:47) Think Harder: 1x (29:07) Whoopsie: 1x (34:04) What Does This Mean?: 1x (25:09) Middly Digit: 1x (29:28) Most popular number(>9), digit and colour this video: Twenty Seven (10 mentions) Seven (69 mentions) Green (14 mentions) Antithesis Battles: High (5) - Low (4) Even (2) - Odd (0) Higher (3) - Lower (2) Outside (2) - Inside (0) Column (11) - Row (7) FAQ: Q1: You missed something! A1: That could very well be the case! Human speech can be hard to understand for computers like me! Point out the ones that I missed and maybe I'll learn! Q2: Can you do this for another channel? A2: I've been thinking about that and wrote some code to make that possible. Let me know which channel you think would be a good fit!

[@laurasmith2173]

I adore the incredibly long videos. They are my first choice when looking for something to watch and I would love more of them. :)

[@psiphiorg]

I got stuck about 20 minutes into my solve, so I paused my solve and started watching Simon's. Then he said something about the make-up of the lower left renban that triggered a notion about the central renban in my puzzle. So then I paused the video and went back to my puzzle. That bit of inspiration helped get me unstuck on the central renban, and I got moving forward again. My final time (ignoring the pause to watch Simon for a bit) was 40:01, solver number 1031.

[@77kaczka77]

Beautiful preparation of break in by logic of lines. ❤ it

[@bernhardwerner2526]

I love the way Simon not spotting normal Sudoku in minute 19 but take a very hard way to get the same result

[@artieghatavi416]

46:23 for me! My first solve in a very long time. Love the logic in this one.

[@chocolateboy300]

I finished in 65 minutes. That was a very fun break-in using the 5s, then realizing 7s can't be on the green line with 1. The rest was a bit more challenging but seeing that some cells are always forced to be the same was cool. Great Puzzle!

[@dannstarrjp]

32 min for me, absolutely loved this puzzle. So satisfying 😊

[@BozoTheBear]

Beautiful puzzle! I really struggled through it, but could see there was some great stuff going on, so had to watch Simon do it better, Pleasure to solve and watch.

[@Piatato]

Very nice puzzle! Super elegant

[@EmonEconomist]

Finished in 36:57. An interesting puzzle - I'm not used to seeing german whisper lines being "forced" like that, so it took a bit to get my brain to believe and accept it! Very cleverly done.

[@de8o]

Simple trick. Skip to the end of the video and copy the numbers. 😂 my only hope to beat Simon.

[@livedandletdie]

Hahaha works every time but I can't say that sounds very fulfilling.

[@Zalaniar]

Like Simon always says for fog of war puzzles, "You must not cheat!"

[@Paolo_De_Leva]

Magnificent solve. 👏👏👏👏👏👏

[@wossaaaat]

Yes, would be great if you could post the long ones! Love the marathon solves.

[@leeuwevdh]

Tulpenblüte means “tulip blossom” in German, not just tulip :)

[@ezruff]

Ah yes, REMbands hit song "That's 3 in the corner, that's 3 in the spotlight"

[@looweeg4229]

So I was watching the video while cooking. 5 minutes later I realize that there's a 3 in the corner... Did I rewind the video to see the confetti? Absolutely.

[@Anne_Mahoney]

I found the book in my mail slot when I got up this morning! Perfect way to start the day. 😺💚

[@kevinbrownsword9558]

Not started the video proper yet but just wanted to say my ‘Best of’ books arrived today. Got to say the ones are much nicer than I expected with the additional artwork. Lovely items to have (I got the reprint of the 1st ed)

[@wolframiaa]

Hi Simon! Beautiful puzzle. I do love watching the longer solves once in a while, so please upload them to the main channel too :) PS: I finished the Fog of War story last night and it was lots of fun! Loved it

[@xChikyx]

this is not the main channel?

[@wolframiaa]

@@xChikyx Yes, it is! I was answering Simon's question around 3:00 about uploading the long videos here and not only on patreon😅

[@xChikyx]

@@wolframiaa aaahhh okok

[@ruud236]

Usually I'm able to follow his explanation, however i just cany wrap my head around the working of this puzzle.

[@orange11squares]

amazing genius level sudoku setting.

[@smileyface2411]

22:14 Simon also misses the fact that the left Whisper line can't be a 27 pair because of r8c4

[@mavtaco9394]

I got my book in the mail today and already got cracking 🤓🥳👍🏻

[@piarittersporn]

Very interesting and exciting puzzle. It took me quite a long time but I could solve it on my own.

[@AndiMeyer]

Perfect pronunciation of Tulpenblüte. 👍

[@frankjiang1857]

Finished in 38:28. What a lovely puzzle though it had me sweating throughout the solve as nothing really seemed too clear to me. I was able to figure out that 1289 could never be on the non-german whisper parts of the renban line and that if 16 was one gw line, it had to be paired with 27, same with 49 and 38, but for some reason, I never really felt comfortable even until the end. Fun puzzle!

[@paulamcmordie1301]

Just waiting for the Matt Parker collab now...

[@XxProjectZionxX]

I really enjoyed today's puzzle, I sometimes find it hard to pick up the next thread of logic but it flows smoothly from one part to the next. Good work Simon, I've still got a long way to go to match your speed 😢

[@Vorash00]

I did wonder as I solved this if Simon would see the black digits, give he has “given digit” blindness as give how powerful every given digit was especially the 2 and 7 for the break in. Glad he’s got that issue corrected for this solve.

[@HunterJE]

22:12 We know more than just that one is 27-the pencil mark in r8c4 tells us which one

[@adrianhead6272]

GEOMETRY!!! Completed in 12m58s.

[@n_eros]

Astonishing sudoku sir, mine favorite now. I was solving it for 3 hours, lol😂

[@Gonzalo_Garcia_]

19:12 for me. Not an easy one, but I really liked the solvepath. Great puzzle!!

[@jubileejazz]

Great puzzle, great solve, but almost impossible to see the green lines, being red/green colour blind.

[@AP4190-jn9ve]

The logic around the 18:00 minute mark revolving around the digits in box 4 -where does r6c2 go in box 1 and r4c2 in box 7... so much simpler ways to do that - in one case you know there's a 6 on the bottom line somewhere, and by sudoku of the 6 in r1c1 it has to go in r6c2. And the 34 pair at the bottom of column 1 makes r3c1 an 89 and r4c2 thusly a 34

[@jakeharrison7840]

'digits connected by a thin green line must differ by at least 5 ' that indicates that 1 goes with 6,7,8,9, but that digits have got to be consecutive means that there are limits to what can go in I understand now.

[@PathOfShrines]

Really cool puzzle. 45:36

[@happygirllife1342]

Simon, you said "Tulpenblüte" absolutely perfect 😊 amazing solve

[@Mx-Alba]

When I did this one I must have missed one or some of the logical intricacies of the renban whispers so halfway through I had to resort to both Phistomefel patterns to force some digits to resolve... But I got there in the end. :D

[@Squishy3757]

Or ask yourself, how many 2s and 7s can be in column 4. The mind of Simon is always prioritizing finding next logic and in the process ignores past logic until the trail runs cold. At the expense of easy deductions.

[@emilywilliams3237]

It's one of the most fun things for me to watch!

[@erickehr4475]

Yes. Simon’s thoroughness is both a blessing and a curse. I’m almost the complete opposite, in that I’m always leaving the current trail if something I find refers back to something I deduced earlier. I think my way is quicker on average, but Simon’s is more likely to actually find every bit of logic.

[@davidenas]

This video would 5 minutes shorter if Simon said "1 through 7" instead of "1 2 3 4 5 6 7", and the same for other options. As for the puzzle itself, it's great how a single logic created by it's structure gets so much mileage throughout the whole thing.

[@iambicpentakill]

LOL

[@ChrisConnett]

Expanding my vocabulary in addition to my logic. Today: hypothecate; in a recent video: odiose.

[@myname647]

Hello Simon, lovely solve as always. I enjoyed it very much. My own attempt took me a little over 90 minutes. I noticed you saying you misclick sometimes because you press the spacebar too often, around 37:27. Might I try to help you with that? I usually don't use the spacebar at all, but instead press "shift" to switch to corner notation, press "control" to switch to central notation and press both shift and control to switch to colour notation. Releasing the button(s) automatically switches back to definitive notation (to enter digits in the grid). At least for me this way of using notation in Sven’s Sudokupad has been quite helpful, I thought i'd share it. Keep up the good work, your videos are always an entertaining watch!

[@Kinada]

That was pretty cool. 80 min though, I don't know where the time went, it seemed like I was flying through it at the begining.

[@theherofactor]

Wow, I loved this one, even though it took me an hour and twelve minutes to solve.

[@bait6652]

Thats disappointong that u cant really make headway without the givens... u can figure out 1) the allowable D5 dominos 2) restraint on the corner box 5s 3) that the 4 corner box purple lines cant be the same or rather no adjacent/ortho corner boxes can contain the same range 4) that R3C3 must be one of the tips of B1 line

[@Swisswavey]

I found that far more difficult than I thought I would. No idea how long it took me cos I spanned a few sessions but it was over 90 minutes 😮

[@_aullik]

I found this to be incredible hard, but i also never figured out the trick with the middle digits and the border rows.

[@sanctionbuster]

Another follow up question about your Numberphile appearances - I just enjoyed the second! Was it filmed in your house? It's lovely.

[@Rach881101]

44:22 for me. Nice puzzle!

[@MH-dn3jz]

Fwiw I cannot see that green on the magenta except barely. Might be other folks similar. Either way appreciate yall. Just future reference.

[@srwapo]

Welp, I thought the "simple trick" was using that alternative to the phystomephel ring using Rows and Columns 2 and 8 along with Boxes 1, 3, 7, and 9. I made a bit of progress, but it seemed like more work than I could put in.

[@nedbates]

He is VERY LUCKY that his assumption worked that the difference between greens ALWAYS EQUALED five, and was NEVER at least five, as stated!!

[@anthonyhastings5961]

Hi Simon, Did you mention Michael Stipe's birthday on 4th January?

[@oncecursed1]

I’m confused on the why the green lines “have to be 7 and 2” for example. Why not “7 and 1?” The rule is differ by at least 5…

[@icestormfr]

Fyi, this specific luminence&saturation versions of magenta and green are VERY BAD for red/green blind people (like me) 😬

[@glgou4647]

i can't understand 26:30 , what does it mean by "that digit has to find a home" ? there's 2 and 7 and i have no idea how the next steps are done.

[@iambicpentakill]

He means that the digit in box 8 has to go somewhere in row 9. It can't go in box 7 because it can't repeat in the line. It can't go in box 8 because it's already in box 8. So that digit in row 9 has to go into box 9. The only possibilities in those cells are 467, so if that digit in box 8 was a "2", there is no place to put a "2" anywhere in row 9. So it must be a "7".

[@BleachWizz]

guys, can someone help simon setup an eye tracker? It might be cool, I think it'll be awesome

[@user-kt9vr1wj6y]

45:04 for me nice puzzle

[@Zacks-Channel]

Watching Simon solve the puzzle makes sense and I might just be misunderstanding, but I think the rules may have been communicated incorrectly for this puzzle. The rules say "Digits connected by a thin green line must differ by AT LEAST 5" (which implies that two digits could differ by more than 5 - like 6 or 7), but Simon seemingly approaches the problem with the understanding that "Digits connected by a thin green lean differ by exactly 5". The end solution only has digits separated by 5, so I imagine that was the intended rule? But I felt lost approaching the problem at first and trying to account for differences of 6 or 7 in addition to 5. If I'm wrong, please help me understand what I missed!

[@dettonator11]

He did account for that - that was what he was talking about at the beginning before he started putting numbers in. There are only 3 possible sets of numbers on 7-cell renban lines: [1234567], [2345678], and [3456789]. Remember that on every 2-cell green line, there must be a low digit [1234] and a high digit [6789]. If not, their difference cannot be 5 or more. So, let's go case by case. If the renban contains [1234567], there are only 2 high digits to "assign" to the 2 green lines, 6 and 7. 6 can only take 1 as its partner, and 7 can't take anything higher than 2, so 2 is all that's left. If the renban contains [2345678], there seem to be more options, but the low digit can't be 4 because there is no 9 to go with it; likewise the high digit can't be 6 because there's no 1. What's left is two low digits [23] and two high digits [78]. Those four go on the green lines. 7 can't take 3 so it must take 2, and 8 takes 3. Finally, if the renban contains [3456789], there are only two low digits, 3 and 4. 4 must take 9, and 3 can't take anything below 8, so 8 is the only option remaining. To check our logic, let's imagine a scenario where we didn't follow these restrictions - let's say we paired 9 and 3 on a green line. Because the renban has 9 on it, we know the set is [3456789]. So what pair of numbers goes on the OTHER green line in this renban? It can't be 4, since 9 is taken; it can never be 5; and neither 6, 7, nor 8 are 5 greater than 4. So there are NO options for the other green line, and the puzzle breaks. You will see that no matter what pair of numbers you choose, if they are not exactly 5 apart, the puzzle breaks with no remaining options for the second pair. QED

[@Zacks-Channel]

@@dettonator11 Wow, thank you for writing that out!! Your explanation is more than I could have asked for. I had a hard time understanding the full context of that reasoning in the video but the way you broke it down makes complete sense. Sincerely appreciate it.

[@tessabrisac7423]

@dettonator11, thanks, very clear and thorough.

[@six_5000]

oh my gravy... 99:45 on my second attempt 😪

[@Ladyoftheroundtable]

Omg, i determined a line before he did. What is even happening? Top left is a 3-9 sequence

[@robertcousins2274]

24:21 for me

[@5t757]

24:57 for me :)

[@life.with.sabine]

The function of the brain is what is amazing

[@TurquoizeGoldscraper]

55:02 for me.

[@_-_-Sipita-_-_]

27:32 for me.

[@adipy8912]

3:18 Why? Just WHY are you still worried that people don't want to see them??

[@Orenotter]

I won, and I sing a glad song! I got not a single cell wrong! Why was I not the worst? 'Cause I watched Simon first And he mostly just dragged me along.

[@CatzHoek]

Didn't you simplify the problem by changing the rule to "numbers on green lines are exactly 5 apart" instead of the original problem where they have to be "differ by least 5"? So a 7 for example could be 1 or 2, and you instantly took it as a revealed 2. You concluded a lot of numbers because you had one of the green numbers, but in reality it would only give you the choice of two options. The solution obviously meets the criteria but i wonder how much more difficult it'd have been to find it if you didn't cheat a bit by switching up the boundary conditions. Or am I seeing this wrong?

[@maybesomedayknown]

It’s a conclusion that can be drawn from the puzzle. Suppose a 7 digit renban went 1-7. There need to be two possible german whisper pairs from that set. The highs are 6 and 7, so the lows are 1 and 2. If the seven was paired with one, it would be impossible to make another pair 5 apart. Similar logic can be repeated for a 2-8 string and a 3-9 string. Basically, try to fill out a length 7 renban with 2 german whisper pairs. It will break if you try with anything not exactly five apart.

[@CatzHoek]

Ah, i see. Of course. Thanks@@maybesomedayknown

[@Raven-Creations]

@ 39:01 - "I could have got some sudoku wrong" - You mean you did some? I must have blinked and missed it. You had so many easy wins all over the show, all left dangling. For instance you placed 7 in box 2, and there was already a 7 in box 8. Did you think to ask where 7 goes in box 5? Of course not, but there was only one place. You placed 8 in box 3, and about 5 minutes later you spotted that it resolved the 89 pair in box 1. You should have done that when you placed the 8. This was some very elegant setting, using an idea that's certainly new to me.

[@derekjc777]

Incredibly long videos? We do watch your streams… And those are pink lines, not magenta.

[@wibblywobblyidiotvision]

That was fun, 72 minutes, though, I failed to see a lot of the logic. Still, finished it with a 3 in the corner, so that was a win.

[@alessandrogiupponi7721]

I don't agree the 3/8 choice at 24:30...

[@jamesb7906]

I tried this puzzle and failed miserably because I couldnt see the small lines due to the colour scheme lol. This one definitely isnt colourblind friendly 🥲