One Of The Best Thermo Sudokus Ever

** TODAY'S PUZZLE **
It's been a long time since Simon's attempted a "plain" thermo sudoku on the channel but Blashyrkh has come up with one of the all-time great puzzles. It's called Club 27 - we think on account of the fact that there are only 27 cells on thermometers in the grid (surely some sort of record?). The way this solves verges on the unbelievable.
Play the puzzle at the link below:
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Rules:
Normal sudoku rules apply. Along a thermometer, digits increase from the bulb end.
** PATREON BONUSES **
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They'll also be a bonus crossword video from Simon and his solve of Region Geometry by Emre Kolotoğlu (3hr 36min long...!) released over the weekend. And Simon's discussion video about Dean Mayer's Sunday Times crossword from last weekend will appear at 1minute past midnight on Sunday morning (which is the moment that competition has ended.)
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▶ Contents Of This Video ◀
0:00 Theme music & puzzle intro
1:24 Our Thermo App
2:00 New Islands Of Insight video OUT TODAY
2:57 Last Call BBS Stream
3:29 Happy Birthday
8:09 Rules
8:43 Start of Solve: Let's Get Cracking
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[@abcdef-lp9qc]

Blashyrkh here, thanks everyone for their kind comments! And congrats to Simon for a very strong solve, seeing things really quickly. The video is only so long due to your generous explanations. The puzzle of course references the number of thermo cells, but it also alludes to the actual "Club 27", the group of famous musicians all dying at the young age of 27 (Jimi Hendrix, Janis Joplin, many others, more recently Amy Winehouse). This has nothing to do with the puzzle, but it's the one thing that come to my mind when I thought about connotations of the number 27 :D The record for lowest number of thermo cells is something ridiculous like 19, but that's with full-length thermos. This might be a record when the length is limited to four cells, no idea.

[@emilywilliams3237]

This is the kind of video that, when I was first watching a couple of years ago, I would have had to pause and rewind and watch again and think about it and then watch again several times - most of the time - throughout the video. Today I just accepted it and understood it. And this is totally thanks to you and Mark and the great instruction and demonstration that you do every single day. What a world of pleasure in variant sudoku CtC has opened to me - thank you so much, Simon.

[@Millenassang]

Same! I probably wouldn t have managed to solve this puzzle on my own but when facing the logic explained by Simon, I understood how it worked

[@davidrattner9]

Just absolutely magical said from you Emily!!

[@emilywilliams3237]

You are the kind of encouragement to positivity that the world needs, David. Thank you very much!@@davidrattner9

[@DidWeWin1]

Likewise. After pausing a moment, I spotted R1C1 as the most restricted, and the cell the setter wanted you to be thinking about. I wasn't able to deduce it was a 5, and probably wouldn't have without a LONG think, but simply recognizing it as the point of interest is a sign I've learned a lot.

[@brianj959]

I agree! And to take an example, I figured out that it would be a 5 in R1C1 about 30 seconds before Simon said it: two years ago I would have had to rewind and retrospectively study Simon’s conclusions to understand. I’ve very much loved watching CTC over past few years; I even get a certainly pleasure yelling at Simon’s scanning shortcomings! ;)

[@pvandewyngaerde]

Some of these puzzles are amazing. Sometimes the hardest part for Simon is choosing the colors. CtC = Choosing The Colors.

[@biaberg3448]

😂

[@pilotben97]

"I think that's a 5" at 17:35 is just so insane to someone who has just started randomly watching these because it's interesting and haven't done much with abnormal Sudoku. 'oh so we're just randomly saying digits now, I can do that too'

[@bobblebardsley]

It's even more insane when you've been watching these for a while and you start to sometimes know WHY it's going to be a 5 even before Simon explains it. I still can't even begin most of the puzzles featured but I sometimes see where a logical deduction is going and pre-2020 I had never even heard of abnormal Sudoku, much less attempted to solve one. Enjoy the ride, it's a fun one!

[@chris5619]

I've been watching for years, and, at least trying to, solve that whole time. I've gotten to the point where I can solve almost all the puzzles on here, some "faster" than Simon or Mark. (I put it in quotes because I'm not trying to explain everything as I do it.) I was able to break into this puzzle and get that 5, but even when I saw the pattern starting to develop, it took me a while to really convince myself (I was able to first eliminate either 12 or 89 from the row or column logic [I don't remember which] and then the other pair. So I marked that cell 34567. A that point I assumed it would be a 5, but still had to think about it a bit. Then I watched Simon's solve. And it even amazed me that he just came out with the "I think that's a 5" as quick as he did.

[@jeffreyhall3944]

@@bobblebardsleyhappens to me sometimes too. Obviously Simon is 1000x better at this than I am but I’ll occasionally just blurt out that something is a 2 or whatever and impatiently wait for him to get there

[@wenen4510]

While trying to solve this, I also came to the prediction that r1c1 had to be a 5. It's funny how I'd never have been able to do that without watching CtC videos for years. Alas, I tried so hard to prove it was a 5 but couldn't reduce it further from 456. Maybe a few more years of watching will bring me to that point!

[@bobblebardsley]

@@wenen4510 I'm probably at a similar level. I could see that the thermos had to contain most of the extreme digits between them and then it's a case of looking for cells that see them all, but I couldn't quite nail down the restriction enough. You definitely get suspicious of 1, 5 and 9, and anything adding up to 6, 10, 15 etc (or 24, 30, 35) after you've watched enough CTC vids.

[@MaierFlorian]

Simon: what is the next step that we should do? Me: I bet it's Sudoku. It's always Sudoku when Simon asks this question 😅

[@studgerbil9081]

that's our man Simon. He found a great break-in and got stuck with the 5 in col 6. This is Simon's elite world and we're just living in it.

[@inspiringsand123]

Let's Get Cracking: 08:47 Simon's time: 41m20s Puzzle Solved: 50:07 What about this video's Top Tier Simarkisms?! Bobbins: 3x (37:03, 37:26, 37:33) Maverick: 3x (13:31, 13:36, 13:38) Especially When They’re Kind: 1x (51:41) ​Scooby-Doo: 1x (41:38) Phistomefel: 1x (07:54) And how about this video's Simarkisms?! Brilliant: 7x (01:16, 03:47, 04:00, 05:36, 06:08, 22:10, 31:16) Clever: 6x (17:25, 17:28, 38:09, 38:12, 50:04, 50:23) By Sudoku: 6x (36:33, 37:18, 38:16, 38:54, 40:13, 49:54) Obviously: 6x (09:35, 10:45, 12:42, 13:19, 25:38, 37:50) Beautiful: 5x (30:45, 37:20, 42:38, 50:48, 51:09) Gorgeous: 5x (28:58, 29:00, 50:55, 51:00, 51:05) Ah: 5x (28:56, 34:09, 44:05, 46:53, 48:20) Pencil Mark/mark: 5x (09:01, 09:57, 47:19, 47:21, 47:23) Hang On: 4x (35:41, 35:52, 36:37, 42:21) Sorry: 3x (07:57, 20:39, 34:09) Cake!: 3x (02:02, 05:04, 05:34) Of All Things: 2x (40:23, 47:43) Wow: 2x (47:23, 51:38) What Does This Mean?: 2x (28:32, 34:52) What on Earth: 1x (16:35) Goodness: 1x (49:04) Naked Single: 1x (49:40) The Answer is: 1x (14:36) Fascinating: 1x (07:54) Incredible: 1x (22:45) Ridiculous: 1x (17:22) Astonishing: 1x (00:26) Take a Bow: 1x (51:34) Come on Simon: 1x (41:55) Surely: 1x (29:36) I've Got It!: 1x (42:52) Stunning: 1x (51:16) Unbelievable: 1x (22:27) In Fact: 1x (01:21) Full stop: 1x (50:50) Alexa: 1x (12:06) Fabulous: 1x (04:05) Unique: 1x (01:06) Symmetry: 1x (09:13) Most popular number(>9), digit and colour this video: Eighty Nine (7 mentions) Three (72 mentions) Blue (31 mentions) Antithesis Battles: Low (4) - High (1) Even (3) - Odd (0) Lower (12) - Higher (6) Lowest (4) - Highest (0) Column (12) - Row (10) 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!

[@fatha2092]

The video hasn't been up for 5 minutes and yet the statistics is already up

[@soulus98]

This is so cool!!! Keep it up

[@tzwenne6413]

I think the program confuses „8 and 9“ with „ eighty nine“

[@raineca]

When Simon asks a rhetorical question I always answer out loud! I am sure I am not alone!

[@stevenwojtysiak6392]

Not sure why, but this remark reminds me of those videos where the girl is watching the person put the shapes in the box with the shaped holes cut out and the person asks where the block goes and always puts it in the square hole, no matter the shape, and the girl gets so distressed.

[@biaberg3448]

Me too, and my husband: What did you say. Me: I’m not talking to you, I’m talking to Simon/Mark 😂

[@10prozenthimmel]

Isn’t Club 27 also the kinda morbid nickname for rock stars who died at 27? Jimi Hendrix, Janis Joplin, Kurt Cobain, Amy Winehouse et al.?

[@Papierrazzi]

Had the exact same thought. Could be a coincidence or some sort of tribute.

[@notthatseanbean]

I was immediately like "A Quaffle of Birthdays". For no reason whatsoever that just made total sense.

[@SourabhDas95]

Haven't watched the video yet, but this puzzle has no right to be as good as it is! Just...incredible!

[@bluerizlagirl]

If anyone knows the minimum number of thermometers necessary to give a unique solution, Philip Newman or Sam Cappelman-Lynes probably will.

[@samueldeandrade8535]

Well, there is a sudoku variation puzzle with just one thermo, but it is a different one, with 2-digit numbers. Pretty awesome. It forms a chinese coin, if I am not mistaken. So it is also beautiful.

[@Anne_Mahoney]

The Sudoku Theory wiki (which I think Philip runs, with other contributors) says the minimum number of thermos is 3, and it's conjectured that the minimum number of cells in thermos is 20 but that's not proven yet. Discussion happens in the theory channel on the CTC discord and I would not be surprised if the thermo question comes up again there.

[@samueldeandrade8535]

@@Anne_Mahoney omg, I need to see this sudoku with only 3 thermos.

[@MarkBennet10001]

One of the few I've stopped the video right at the beginning to solve the puzzle. Looking forward to seeing what Simon makes of it.

[@bobblebardsley]

Loved it. I didn't spot the break-in, although I could see 1-2 in box 2 and 8-9 in box 4 were restricted, but I never think of the 'reciprocating thermos' logic. But I do think it was reasonably 'approachable' logic and everything after that was standard thermo logic and just a really satisfying solve. Excellent stuff.

[@kuraban1]

Whilst I am prone to some good ol' fashioned Goodliffing, in honor of Simon I thought I'd give it a go finding the break-in without pencilling any candidates. Pleased to say that I got that first digit without a single pencilmark! Then proceeded to pencil all the thermos in row1 and col 1 to make my brain relax a little. #TeamGoodliffing

[@jamesmclean-db3dw]

I am a sudoku grunt, but aspire to be like Simon …… it’s going to be a long term project!!! After 80 minutes, figured where the 5 was and collapsed with glee. Simon’s explanation was so much more logical and elegant….. thank you !!

[@n8style]

Clever and elegant, really enjoyed it!

[@Mason-lr5dz]

Simon and Mark should each try their hand at composing a puzzle, with the other tasked to solve it. Could be fun.

[@thebitterfig9903]

I was dying for literally *FIVE* minutes in the tail end there.

[@BovineFreedo]

Alexassume nice to hear you are always listening

[@chris5619]

If she wasn't always listening, she'd never hear anyone beckon her.

[@erikpaige2165]

You are brilliant Simon! ❤

[@sampathkumar-ej7xl]

Simple rules and impossible to crack with so many options. Enjoyed Simon's solve. Awesome setting!!

[@oak3001]

Here is a kind comment for you to enjoy ;-)

[@bobblebardsley]

Here is a kind reply for you and the KZbin algorithm :)

[@parkerbond9400]

Amazing break-in! I realized that the 2 sets of thermos interacted and felt that R1C1 was probably 5, but I wasn't able to reason it out like so beautifully like you did!

[@Lucashallal]

36:08 i think simon is getting less restricted with what he considers bifurcation, because although that doesnt seem THAT bifurcate-y, he probably would consider that bifurcation a couple of years ago

[@SirJefferE]

I usually get a little bit more bifurcatey than Simon, but in general, I don't count anything that can be done in my head as bifurcation. It's not bifurcation unless I put a pencil mark down to track what would happen. Simon doesn't do that except as a demonstration once he's figured the logic out, so it seems fine to me. Not sure what past-Simon would have said about it though.

[@Lucashallal]

@@SirJefferE yeah Im kinda the same, but I remember the tatooine sunset sudoku video, and one of mark’s “cheating” bifurcatey deductions was just a simple chain like this one

[@frankthompson9630]

Is there a simpler deduction you can use to progress at that point? I used the same deduction in my solve after being stuck for quite a while, so I suspect it actually is the simplest deduction you can make.

[@GeekRedux]

I know I can get exasperated when Simon comes 'round the difficult way to a conclusion that Sudoku often points to directly, but even so, his analytical skills never fail to impress me.

[@DarkChasm]

Yeah lovely, not too diff, very very smooth run. alot of sudoku's are painful to discover where to go next, but this one was really smooth.. loved it alot ❤❤❤❤

[@TurquoizeGoldscraper]

57:04 for me - that was an interesting way to link the thermos, glad I worked through it.

[@aaronfuzion]

Not sure I could have started this one. What a cool design!

[@ericpraline1302]

Wow, this is a seriously clever puzzle which it was a privilege to solve.

[@AndreAy1975]

Solved it with much help from the video.

[@thenatundi9009]

This one almost got me; so proud that I managed to crack it without bifurcation

[@Florian-1291]

This sudoku is brilliant

[@MarkWiseTechno]

I recognized there was significance to the pattern of those thermos right away but would never have figured out that r1c1 had to be a 5 without the video. Once I had that, though, it was a pretty smooth solve! Amazing thermo puzzle!

[@CatzHoek]

It's absolutely outrageous that your very first conclusion of this solve was essentially a sudoku one.

[@flsal27]

Anothe Sudoku grid with no digit clues inside the grid, around the grid or in the rules. Incredible!

[@MattYDdraig]

34:48 That top left corner is an astounding miracle. The work at the bottom to sort out the choices on the pair of pairs was even better!

[@studgerbil9081]

FWIW when you have an unusual number of birthdays on one date, it's usually a cluster of birthdays.

[@chocolateboy300]

I finished in 73 minutes. I was so close to finding that break-in. I just didn't appreciate the fact the arrows are starting and stopping in different places, influencing their min and max. I did speculate that 5 was in the corner, but couldn't prove it. I had to give up and watch the video, which is disappointing that I couldn't figure it out. It seems like with these pure rulesets, that I struggle with the most. Maybe I gave up too fast. I still enjoyed the puzzle, even though my performance was weak. Great Puzzle!

[@13vatra]

Not sure if it's related probably not. But there is something called the 27 club. It's a group of musicians that have all died at age 27. There is a myth surrounding it about if a musician dies at age 27 then they're one of the greatest.

[@davidrattner9]

Fabulous thermo, not arrow, sudoku with such an aplomb and panache solve from you Simon!!!

[@glum_hippo]

You adjectived your nouns! No fair! 😅😅

[@Pointlesschan]

Thermo, not arrow… sorry, being pedantic 😂

[@davidrattner9]

@Pointlesschan yes..I knew that lol 😁

[@tna_handyandy5173]

This puzzle is simply "wow!"

[@igaparadowska4938]

It’s so fun that Mark has a pencil but Simon colours 😂

[@omardiaz6255]

So true!

[@Pathogenus]

as a person who usually struggles with breaking into this kind of puzzles. i actually managed to do it, as it's so well telegegraphed where to look first and where's the next step. so whenever i got stuck, i knew i had to think harder about the thing i was thinking about, rather than looking somewhere else for ways to progress. also i like how after doing all of this logic, i was stuck with ambigous 6,7,8,9s cause i forgot thermos logic is still a thing.

[@erickehr4475]

28:57 for me. I saw after a few minutes that the top left cell was restricted. But it took me longer than I would have liked to work out why it was actually completely restricted. A very impressive concept

[@ffets-SEP]

I thought about this one for over half an hour and had no idea, how to tackle it. I tried to prove, that all bulbs are different and failed, of course, they are not. Then, I decided, to leave this one to the experts.

[@glum_hippo]

18:26 for me. Delightful ideas in this one!

[@JohnRandomness105]

42:00 I don't bet, but I expect Simon to find some ingenious way of placing 6 R5C6, without using the 5 a few cells above. It helped me, I think, when I realized that 7 in block 7 was at the end of one of the thermos. 44:00 I'm often wrong. That's why I don't bet. I needed a couple pointers from the video in doing the puzzle, in particular the top band dominoes. (Once I was given that for 1234, I figured it out on the left for 6789.)

[@piarittersporn]

Quite difficult but wonderful puzzle.

[@laurv8370]

Tried for about 10 minutes to break it. Then decided to watch the video ☺️

[@Raven-Creations]

What a brilliant and innovative construction. This is exactly the type of puzzle I love, a single variant rule, and elegant setting making excellent use of the variant's properties. More like this please, and fewer of the many-variant puzzles. No 3 in the corner was a bonus for me, because it's a joke who's use by date has long since expired and it's starting to reek. Poor Mark who is clearly embarrassed by it all has been coerced into going along with it too. Please turn off the celebration in the settings and move on from 2020. @ 35:42 - "there's a 5 definitely in this domino" - and if you had only checked, you'd have seen which of the cells it was. Even better would have been if you'd checked at the time you placed the 5. That rules 5 off the thermo in boxes 7&8, which puts 89 on the tip, disambiguating the lines in C1-3. All those easy wins missed for the lack of a moment's glance. @ 44:44 - "there's an 89 pair in this column" - which just like with the 5, you could have resolved. The 7 in C1 is looking at a 78, which makes the tip 9, resolving the pair. @ 46:16 - "this digit is under quite a lot of pressure" - if you used your pencil-marks, you could put 5 in there. You've got a 24 pair in box 8, and 4s pencil-marked in box 9, both in R8/9, so 4 can be placed in box 7, leaving R8C3=3, which resolves the whole of boxes 1 & 7.

[@varoonb6593]

Yesterday I was able to spot some of the moves before Simon did them. Today I'm back to being clueless😂

[@stevesebzda570]

@ 16:05 Did Simon say "This is arbitry?" Isn't that "arbitrary?" That's a 4-syllable word ("arbitrary"). That reminds me of something else that's spoken strangely over there. "Secretary" pronounced as "secretree." This is no big deal (you know what they're saying), but this kind of thing is hugely important in saying "Topiary" (that's a 4 syllable word) and if said as "tope ya ree," how is anyone you're speaking to going to glean "Topiary" from "tope ya ree?" See?

[@default8522]

Didn't expect to see an Immortal reference in Cracking the Cryptic of all places

[@AyaAlef]

At 2:50 kinda sounds like an alien invasion

[@frankjiang1857]

Finished in 38:58. Absolutely lovely use of thermometer mechanics to force the break-in in box 1. Fun puzzle!

[@ambbarnes9839]

If you ever want to find put whats flying near your house, there are websites that track all planes. You’d be able to find out whats flying and where from!

[@Kirbyfan87827]

Finished in 25:51 by following along with the video.

[@cotg8029]

I just cant do puzzles like this where you have to make an assumption and go with it, hoping it works. 50/50 chance you guess correctly.

[@petergerlagh9858]

this one was tricky, had lots of mistakes in my own solve

[@timcotton1782]

I hope Mark enjoys watching Simon forced to pencil 5 digits in a cell...

[@theredstoneengineer6934]

76:36 for me

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

30:44 for me. had to guess once and the next move was crazy.

[@BH-js1ev]

Solved it by Intuition in 22 minutes. Figured out there was pressure from bith sides on r1c1, so I put a five there. Assumed it must be on the opposite thermo. Both guesses were right. It worked without having proven anything.

[@ayakoa2096]

Why would you do this to yourself😢 isnt the beauty in not guessing?

[@RichSmith77]

You found a solution. Whether you solved it is, I would say, debatable.

[@steve470]

I'm a bit surprised by the snobbery in these comments. I could easily see a speed solver go, "This cell is clearly under a lot of upward pressure and a lot of downward pressure. I'm pretty sure it's got to be 5 - I'm gonna go with it, and not take the time to prove it." Are speed solvers not actually solving? More importantly, there are no sudoku police - do whatever you find most enjoyable. And I would encourage others not to dump on people for enjoying a puzzle as they see fit.

[@RichSmith77]

@@steve470 "Are speed solvers not actually solving?" As I said, I consider it debatable. In my view, I would say no, they're not "solving" if they're making educated guesses along the way. I don't have an issue with anyone tackling these puzzles anyway they see fit. If they get enjoyment from it, that's great. I just dispute the claim that they "solved" the puzzle. That's all.

[@steve470]

@@RichSmith77Per Merriam-Webster, the first definition of "solve" is "to find a solution, explanation, or answer for". Per Chambers, "to discover the answer to (a puzzle) or a way out of (a problem)". As I said, I consider it snobbish - that someone would not only differentiate the two, but post an unsolicited negative reply to someone else's comment to point it out. That's all.

[@alxp5892]

No face in the thumbnail, got to play CTC Roulette today Except both outcomes are great :)

[@emilywilliams3237]

I agree - but I think that Simon often does not include his face, and Mark almost always does these days. (And the time of the video suggests Simon rather than Mark.) I look forward to both of them!

[@leefisher6366]

A Spring of birthdays (Spring is the time for rebirth, and I'm also thinking of the bedsprings...)

[@leickrobinson5186]

Fun puzzle! 26:58 for me. 😄

[@alienrenders]

40:53 for me. Nice one!

[@coltonbaer5648]

Simple sudoku was your enemy in this puzzle 😂

[@robertcousins2274]

25:35 for me

[@ronjohnson6916]

Loved the interaction between the 4 thermos on the left -- and the way they limit the central cell.

[@user-kt9vr1wj6y]

41:19 for me nice puzzle

[@steve470]

36:29 for me. Really cool puzzle. I also took way too long to notice the 5 in column six affecting the thermo below it. Whatever Simon's got, it must be contagious! 😉

[@Orenotter]

Sudoku rules (normal) apply. Thermometers run low to high. Seems easy to win it But at 52 minutes It's better, I think, I don't try.

[@Gonzalo_Garcia_]

18:10 for me. Great puzzle, loved the break-in!

[@gilladams1521]

A celebration of birthdays

[@joostvanrens]

A party of birthdays?

[@ScorpioHR]

Could I have a pin for absolutely no reason. At least I assume there's absolutely no reason...

[@RichSmith77]

📌

[@sapidum9911]

Simon you're still on dial-up??

[@stevesebzda570]

I have no idea why Simon continues to always go for dark colors (obvuscating and making it hard to see his own pencil-marks). No idea Why is that? Okay, I see for colorblind reasons, but aren't there any two lighter colors that are colorblind-friendly?) Simon often uses (or even runs out) two or more. I lightened mine up. Why not lighten them up? (That's consternating) You go,though, Simon..

[@strangelyjamesly4078]

A wish of birthdays

[@maspleben]

I am late to the party sorry, but I don't understand the logic of this one. With the colour domino, Simon assume that two digits are higher that the two other, and place them together on the opposite thermo. And from that he has a 1-2 domino and a 3-4 domino. But why was it not 1-4 and 2-3 let's say, with one digit being smaller and the other bigger than the two others. I don't get how you successfully prove this point.

[@RichardDeMartino-so6tl]

++++++++++++++++

[@cls022268]

Just get rid of the colors

[@LednacekZ]

nice solve. except the excessive use of the word Assume.

[@edwardshephard3036]

Why do you feel the need to criticise Mark’s approach every time you do a thermo puzzle? Can’t you just do your own approach and leave Mark to do his?

[@NinjaWhaines]

Because it’s all in good fun and we can all (including Mark) have a good laugh.