This Sudoku Is Astonishing [MUST WATCH]

[@thebishop4112]

I'm so glad you featured this puzzle. I tried it a couple of days ago on logic masters and got absolutely nowhere, so I was curious to see how the break in worked. I was convinced it would involve SET (as most puzzles do when nothing else seems to be terribly helpful), but the truth was far more beautiful than that. It was an absolute pleasure and privilege to watch this solve, even though it was far beyond my abilities. On a related note, can I say how impressed I am Simon with your presentation of these videos. Your clear and lucid explanations are truly wonderful, and I absolutely adore your demeanour - never patronising or boastful, always welcoming and friendly. I still enjoy being called one of your favourite people, and would happily be told "the secret" another thousand times! Watching you solve this puzzle too is a reminder that, although I've never heard you claim any credit for yourself, you too are a bona fide genius. Keep doing what you are doing. It is very much appreciated.

[@spin-rg9ib]

funny no clue how to start but it all makes perfect sense in the end. well it is kinda set just not how you typically do set. it was matching digits from the lines to the columns. i got right away that box 9 was bigger than box 2 and box 2 was bigger than box 7. but had no idea where to go from there. needed alot of help to break in the puzzle on this one.

[@Waggles1123]

You *can* formulate this as SET and technically only involves two 9-cell regions, but it does require you to swap for equivalent sets a few times. It's very difficult to explain in text, but it makes sense what you're doing, and you don't have to keep stacking sums in mind while you do it.

[@danielepicone1480]

I honestly managed to break-in using SET. Simon's way is exactly the same as mine; he just explicitly explained what the SET would imply.

[@wokkawicca]

Late to the party as usual, but I also used SET to break in. It figures... the one time I see a SET path right away, Simon finds a more elegant explanation.

[@adammorse710]

Yeah, I had the same experience. Struggled with looking for a set approach or a math approach to the break-in, but couldn't find it, then gave up and had a delightful time watching Simon solve it.

[@tonymanngreenwich]

Wow! "Must watch" indeed. I am utterly in awe of both Jay Dyer, for setting, and Simon for solving. But I was much faster than Simon in one respect - I realised much sooner that I hadn't a clue how to begin.

[@leftysheppey]

You can't sell yourself short Simon, your job is solving some of the most ridiculous puzzles in the world, a feat you nearly always accomplish. You're one of the reasons why these amazing setters have a reason to set the puzzles in the first place

[@studgerbil9081]

that is so true. The exposure that setters get, particularly on this channel, has raised the level immeasurably. It is a joy watching Simon solve puzzles like these.

[@leftysheppey]

@@studgerbil9081 i think this is only the start too. If you look at Rubik's cube, for example, 40 years ago, solving it took days. Now there's hundreds of variants which get solved in fractions of the time. Or chess, 200 years ago some people were good, but did they have the knowledge and theory of Carlson? Simon and Mark are probably the catalyst that will elevate sudoku so much more in the next couple of decades, whether this channel is still ongoing at that point or not. The work that's been put in over the past 4 years, including new variants, is astounding

[@UnderAcheiver1]

That's amazing, completely ludicrous. I almost felt like crying watching that break-in cascade backwards. That's just a thing of ecstatic beauty, Jay.

[@aarongallagher8039]

A joy to watch Simon get quite emotional about the genius of Jay Dyer. I have no idea how worked out the initial break. Genius setter needs a genius solver :)

[@yvibrrr]

I manged to pencilmark R4 C1 🎉. Very curious about the break in, so I can fill the grid with more pencilmarks, maybe even real digits. 😀

[@DarkestTimelineBritta]

That's as far as I got too.

[@saedhmidat4764]

If it was not because of you Simon, I wouldn’t be even nearly close to appreciating this puzzle and understanding Jays genius. Simon ! You are also a genius

[@AhsimNreiziev]

Yes. Yes he is.

[@the29monkeys]

I must say, Jay + Simon is one of the pure joys in life.

[@biggboss83]

21:54 I thought Simon was about to start crying over the elegance of this puzzle 🥲

[@MikeMcNamara]

"I don't deserve to solve these problems. These people are so ridiculously clever." It's nice to hear Simon (who is a lot more ridiculously clever than me) say the thing I think multiple times a week, even when I do solve them myself.

[@blumousey]

I've thought of something for Sven that could be potentially useful as a pencil mark. The ability to draw your own killer cages with totals in the corner, to allow you to annotate groups of cells where you know the sum. Don't know what he thinks of that?

[@GeekRedux]

That feels like it would be tough to code, but it sure would be handy. I've often wished for that tool.

[@emilywilliams3237]

I am always impressed with your ability to see the break-in, Simon, and this video was absolutely astonishing in that regard. Thanks for this video!

[@Rubrickety]

I was knocking on the door of the break-in to this puzzle - or maybe just wandering around the front lawn - but couldn't make it across the threshhold. Amazing construction.

[@henrymarkson3758]

The look on Simon's face when it dawns on him that Jay Dyer is a genius

[@Tsunami14]

In my mind, this is the puzzle that puts JD up with the greats of Phistimophel. Truly amazing setting!!

[@istvanmagi473]

Colour coding, Simon style: 1. When you mark 2 different numbers, do it with light green and dark green. 3. Ask "Where the green digit is in row one?"-

[@stubbsz]

You can tell how involved he is when he forgets to consider colour-blind folks. This time, you he choses two colours so close together, half of us need to adjust our monitor settings.

[@falloutfan2502]

You beat me to it. :)

[@janTasita]

​@@stubbsz Interestingly, I'm colourblind and I actually find the two shades of green easier to tell apart than the blue and purple he often uses!

[@Scarybug]

Lime and Forrest green are as if not more different in hue to Red and Orange. We only really insist orange isn't a yellowish shade of red because it has had a name on a crayon that was ubiquitous in early childhood. If we insisted on calling lime green "lime" it would probably gain the same distinction as orange. (A color named after a fruit that everyone assumes is a fruit named after a color)

[@eshelb.m.5575]

1. Make a list of the steps in Simon's coloring 3. Forget the number 2 in the list

[@mattjones2477]

That was truly extraordinary! A privilege to watch. Thanks Simon and Jay.

[@alicebordarier3308]

This must be my favourite puzzle ever! How can the geometric shapes involved in the break in be so simple, but still so hard to see? The excitement when one starts to have an inkling of what the break-in is going to be... The pure joy and wonder when it crystallise and is even better than imagined!! @JayDyer this was pure beauty packaged into amazing logic... ❤And what a solve by Simon: a perfect execution of that master piece!

[@MattYDdraig]

46:36 Simply amazing. I couldn't have begun to solve this puzzle a year ago, but now I can appreciate it even better when the penny finally dropped. One of the best break-ins I've seen.

[@A_CC_K]

Yay a Jay Dyer puzzle! What a great way to spend an evening. Loved the monopoly fact.

[@myfyrmadocjones]

How does anyone spot a break in like that - amazing!

[@katiekawaii]

Simon spots break-ins that I can't see even when they're shoved right in my face. 😅

[@inspiringsand123]

Rules: 05:16 Let's Get Cracking: 06:46 What about this video's Top Tier Simarkisms?! The Secret: 4x (14:04, 14:21, 38:16, 39:23) Three In the Corner: 1x (57:06) And how about this video's Simarkisms?! By Sudoku: 9x (25:46, 26:11, 32:03, 36:59, 45:22, 46:36, 46:39, 56:52, 58:53) Ah: 9x (06:24, 16:43, 16:59, 29:21, 43:49, 46:24, 47:53, 51:23, 55:02) Sorry: 8x (03:57, 03:57, 09:14, 10:44, 12:27, 15:10, 36:01, 46:22) In Fact: 6x (01:21, 01:45, 02:12, 17:22, 26:28, 38:23) Brilliant: 5x (01:09, 01:09, 04:37, 55:53, 59:11) Obviously: 4x (06:14, 08:22, 12:08, 23:42) Good Grief: 3x (09:04, 41:20, 41:30) Nonsense: 3x (02:51, 14:12, 30:42) Clever: 3x (18:49, 42:55, 59:32) Ridiculous: 3x (30:24, 59:34, 59:34) Hang On: 3x (21:29, 30:29, 30:56) I've Got It!: 3x (51:23, 53:55) Pencil Mark/mark: 3x (29:38, 36:57, 57:46) Weird: 3x (15:42, 15:42, 15:45) The Answer is: 2x (17:32, 52:43) Beautiful: 2x (25:15, 25:29) Wow: 2x (59:15, 59:15) Lunacy: 2x (19:12, 19:15) Cake!: 2x (04:40, 05:09) What on Earth: 1x (28:31) Naked Single: 1x (53:50) In the Spotlight: 1x (57:08) Stuck: 1x (09:33) Lovely: 1x (04:21) Incredible: 1x (22:11) Going Mad: 1x (51:32) Surely: 1x (44:33) Think Harder: 1x (11:31) Propitious: 1x (08:01) Almost Interesting: 1x (38:56) What Does This Mean?: 1x (28:58) That's Huge: 1x (26:42) Triangular Number: 1x (08:39) Most popular number(>9), digit and colour this video: Twenty One (24 mentions) One (80 mentions) Green (28 mentions) Antithesis Battles: Low (4) - High (1) Even (12) - Odd (0) Column (19) - Row (9) 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!

[@sorrowinthewind4258]

It took me over 2 hours but I'm so glad I managed to solve this. All thanks to watching your channel

[@GeekRedux]

21:39 I love how Simon always says "That's it--we've done it!" So encouraging and optimistic about my competence. He's the Mr. Rogers of Sudoku.

[@randysavage1011]

The single best puzzle in CTC history solved in under an hour.

[@djvampire5371]

you weren’t kidding by titling this must watch… it was absolutely brilliant

[@Gonzalo_Garcia_]

23:37 for me. What an incredible break-in!! Amazing puzzle, loved it!

[@karthick_michigooner7431]

You just can't have 2 AHA moments in the same puzzle can you? - @JayDyer you are Out of this World! Break In AHA Moment 1: After 10 mins, if you cannot place a digit.. and there are lots of arrows or lines in the grid - "USE SET THEORY" !!!! Something I have genuinely learnt from watching CTC and I was proud to use my own set theory logic to arrive at the 12s in the grid. Basically used C1, C4 and C7 against Boxes 2 7 and 9. And then replaced the R4C1 with the line in Box 1. That gave me the 1s and 2s in the same places as what Simon got. And then I SAT AND ADMIRED THE GENIUS OF JAY DYER for 15 mins before proceeding with my next step! Midway AHA Moment 2: The 1s and 2s in R1, R2 and R3 - Again spotted it and was stunned by the genius mind again

[@juhak27]

You get an even cleaner break-in by adding Box 1 to the second set so that the difference of the two sets is 45.

[@GuilhermeCarvalhoComposer]

Exactly the break-in I found. I think it's quite easier than Simon's, but doesn't take anything away from the genius of the puzzle.

[@charliecarrot]

Wonderful! Very delightful break in - and a fitting title for the puzzle

[@chocolateboy300]

I finished in 189 minutes. This has been one of the most incredible puzzles I have ever done. Jay's ability to construct these beautiful geometries is absolutely otherworldly. For the first 90 minutes, I was just playing around with any SET Theory, trying to find something. Then, I finally spotted that column 7 of box 3 and 6 were the exact same as those in columns 8 and 9 of box 9. That propagated through the n shaped region sum in box 2, which propagated again to the v shaped clue in box 7. That was an incredible discovery, which was made even better with the region sum clue in the top left. The way that disambiguated column 1 of box 7 from being 22, 23, or 24 was incredible to spot and my favorite part. The way the geometry worked so beautifully to force the minimums values throughout the starting position in box 9 was a sight to see. I don't know how Jay keeps giving these masterpieces. This has to be one of my favorites. Great Puzzle!

[@dinane]

I spent a ton of time trying to basically set theory my way through and just couldn’t quite make it work. The break in is amazing. Jay Dyer is my favorite setter even when I can’t solve her puzzles.

[@bobblebardsley]

Is it me or do those region sum lines look like Bruce Forsyth doing his 'strongman' pose? 💪

[@CrackingTheCryptic]

One of the best comments we've ever had :) :) :)

[@katiekawaii]

Omg they totally do 😄

[@rpb424]

You don’t get anything for a 1-2 pair………

[@bobblebardsley]

@@rpb424 Not in this game! 😎

[@rpb424]

@@bobblebardsley 😀😀

[@ericpraline1302]

What a monstrous creation! In all honesty I doubt I would have been able to start this without getting the merest hint from Simon's solve, but even then it took me some time to finally crack this. Kudos to Simon too - his ability to spot these break-ins so quickly is pretty remarkable.

[@joost00555]

I really liked a blue line puzzle you showed not too long ago (or YT recommeded one from 3 years ago) and that was the first one I actually tried myself. It was tough, twice I watched a bit of you working it out to see what I was missing. So I also started on this one, but my goodness, I could have never gotten to that thought with the 3x6 boxes. Marvellous.

[@StewartyMac]

Loved how you worked out the first three 'rectangles' had to be 30, 27, and 24 then once you discoloured them, seemed to forget this for a lot of the puzzle. Mind you, that's the dictionary definition of nitpicking, as I'd still be here until 100 years old before I got that break-in, so bravo!

[@CassandraComar]

^ me muttering at my screen about how c7 r1-3 have to be 689 or 789 while thinking I can never break into a puzzle like this one

[@miroslavapaleckova838]

This is great sudoku. I stared at it for 1 hour with no solution. But after little hint from video I did it. I was almost there all the time. :D

[@The_Omegaman]

21:45 - definition of speechless

[@wokkawicca]

The title suggested a cascade of restrictions, so I plowed right in with SET (box 7/C2 > box 2/C7 > box 6/box9). I got hung up narrowing down the 6-group totals, and missed the more elegant way Simon arrived at the same conclusions. Got stuck for a long while again until I colored 1s and 2s and applied the great logic there. At least I didn't choose green for both. Took 3 hours. I'm just happy I can actually solve a Jay Dyer puzzle now some of the time. Simon has taught me so much.

[@charlesfrancis5136]

Double like, ABSOLUTELY BRILLIANT and a pleasue to watch. Tha nk you

[@village_vacuumer]

i loved that you used the same color for 1 and 2 but different shades: "where does green go in this box?" Amazing puzzle and solve, thanks!

[@braveheart6816]

Beautiful puzzle, was hoping you'd feature it. I absolutely loved the logic on this one, everything flowed together so smoothly

[@dkamm65]

7:27 For fun, I worked out how many different ways you could populate that 4 cell 2/2 line. It's 416.

[@lesabre04]

Even Simon would avoid you at parties 😆

[@YummyCummyMan]

TIL Legion = 416

[@minamagdy4126]

For anyone wondering, it's just the sum of the squares of the number of possible ways to make a sum using two distinct digits from 1 to 9. It's relatively easy to tabulate that then reduce the list to the final number.

[@Queue28]

Upvoted for Manny Calavera!

[@danielcummins5092]

I never would have found that break-in if I had stared at that puzzle for a month...Simon is very self-deprecating with his own GENIUS! The fact that he found that break-in is equally as genius as Jay's genius to design it.

[@Pwecko]

Amazing. I become more humble every day looking at these puzzles.

[@josephblack2757]

And the title! Watching 6 digits force themselves into 4 three times over. It's like seeing a wave function collapse in sudoku form

[@tralomine]

I found the initial break faster than you because I very quickly saw that *nothing* worked at the start, but since I'm much worse at sudoku that you it took me more time to solve, it's a very beautiful set and very beautiful solve

[@xerodeus2337]

ahhhhhh I was so close to cracking this one!!! I missed that final logic step of box 1 - dang it that was so close!

[@essie1322]

I've been working on this for two hours and havent even touched box 1 😅 I guess I'll just watch the video this time

[@Cymindis]

loved it, and that break it was fabulous!

[@Sternentier]

I love the fact that the amazing break-in doesn't yield an immediate digit. The depth of the logic here is quite impressive. I feel I need a lot more experience with variant sudoku and logic problems in general. I normally just do computer-generated Sudoku on a kindle fire..

[@wertiuz]

I love watching these Videos as the last thing before sleep, sometimes it's a bit hard on my eyes this late. I was wondering if you could do a video in "dark mode" where the sudoku is not in bright white and its just overall not that bright. Love from Austria ❤

[@estherwestbroek]

Installing a blue light filter app if your phone's inbuilt one is not strong enough makes the screen more yellowy/orangey

[@MORISENSEIISGOD]

I was among the testers for this and it was a brilliant puzzle. I found the break in quite quickly as I had used a similar technique for another region sum puzzle by Jay Dyer -Emergence, which was on this channel in June. Well done again Jay.

[@donaldsnyder1543]

Approximately 27:40 Simon gets rid of coloring , I believe a black hole just opened somewhere 😅.

[@eddieharwood7788]

What a brilliant puzzle. I had to watch the break in as I was getting nowhere, after which I made so many small errors that I eventually watched Simon's full solve. I just had 1 helpful move that Samon didn't, getting the 3 in the top left corner much earlier as there was an X wing of 3s in boxes 2 and 3. It encourages me to keep looking when I see Simon always managing to work out what to do, but on this occasion I wasn't getting there.

[@ayakoa2096]

16:12 for me amazing use of the constraint the connection of boxes 7 2 and 9 were beautiful ❤

[@TheClawNinja]

This has to be a top ten all-time break-in, right?

[@MaierFlorian]

What an astonishing break in ♥

[@Piatato]

It's indeed a great puzzle 😊

[@piarittersporn]

What a challenge. After two weeks I tried again today and finally managed to solve it, but it was quite difficult.

[@VonBlade]

It's a video from Cracking the Cryptic. I [MUST WATCH] [sic] them all.

[@wickedsamurai3323]

Really cool start to the puzzle, that was awesome😊

[@debrabowen4276]

It’s like a Chinese puzzle box. I feel blessed, because I am 99% able to follow what Simon is doing. I wish I was capable of actually solving puzzles like this, but at least I am smart enough to value Simon and Mark’s solves as entertainment.

[@Yttria]

Very challenging puzzle. Found the initial break in less than 15 minutes using set theory to create 4 individual sets that were related. I found the first 3 right away and noticed that the degrees of freedom were down to 3. I then searched for a 4th that would drop the degrees of freedom to 0 1) Box 7 and col 4. 2) Box 6 and 9. 3) Box 2 and col 6. 4) Box 4 and col 4 w/ cols 2 and 3. After the initial break in some progress was made before getting very stuck at the point Simon reached around 41 minutes into the video and put the puzzle down after 1.5-2 hrs of working at it. Came back this morning and found the thread that was meant to be pulled (where are 1 and 2 in the other boxes) and finally finished in 175:33.

[@AditaBattleForge]

What a roll!er coaster! Quickly found the compression in col 4 and 7, but got stuck there - still 3 degrees of freedom! Had to watch Simon color box 1 in orange to see the last part of the compression - brilliant! Solved the rest on my own again i 66 minutes, solver #1057! Thanks Simon and Jay, this was beautiful!

[@DarrenNakamura]

I stared at this puzzle for about fifteen minutes without making any headway, so I guess I'm just going to watch the video.

[@fabadam]

Simon needs a little blinking light above his head that means "Silence is caused by ongoing thinking"

[@jonbrowne]

Utterly phenomenal puzzle and solve!

[@TheSonicPerson]

I solved this using SET, but yes it does yield the same result and is truly mind blowing

[@johnh2052]

A key moment in my solve was looking at 1s and 2 in rows 2 and 3. There were 2 in box 1, and exactly one in each of boxes 2 and 3. This tidied a bunch of pencil marks, and gave me the 3 in box 6. If Simon had spent a little more time on the length-3 line in box 1, the solve would have been a little quicker, I think.

[@Danielmoen88]

It was very satisfying using set theory and finally finding the spot to remove the final degrees of freedom to find the break in. I colored boxes 2, 7 and 9, and moved the 6 cells in each box to it's corresponding values outside the box. This left me with: 3 cells in column 1 (24 max), 7 cells in column 4 (42 max), 7 cells in column 7 (42 max) and finally 4 cells in box 6 (30 max) for a total maximum value of 138. Starting out with 3 boxes colored, that's a value of 135, so I had 3 degrees of freedom, and I spent some time figuring out how to remove this, but the solution was as elegant as it was simple (but first you have to find it!); The maximum value of the 3 bottommost cells in row 1 can be reduced from 24 to 21, by looking at the first 6 cells in column 1 with the line interacting with c1r4, and seeing that the minimum value for these is 24, thus removing the 3 degrees of freedom. Mind you, I'm pretty new to sudoku, and by no means good yet, so I'm happy I found it even though it took just shy of half an hour to get to the break in! p.s. not sure if what I did is still called set theory but..

[@Danielmoen88]

Furthermore, after 963 as my first numbers on the line in column 3, my continuation was quite different from Simon's. I colored 1-5 red and 6-9 blue, and looking at the bottom line in column 7, the maximum value this line can have is 12 (if a 3 is placed in c7c7, since column 7 row 7-9 total to 15), and how this interacts with box 5. the topmost cells in box 5 are 2 reds (1 and 2) and 1 blue, and 6th cell in the box is maximum 5 (from box 6 interaction); adding together the maximum value of 12 from the line in box 9, we get a maximum value for these 6 cells as 29, meaning box 5 cell 4, 7 and 9 has a minimum value of 16, and since I have only used 2 blue numbers (1-6) in box 5 so far, I need to place 2 more blue numbers in these 3 cells giving me a 673 triple as lowest possible option to barely fit the minimum value of 16. Placing the 9 in box 5, along with a triple+two doubles, and placing 345 in box 6, as well as the 3 in box 9. This also gives me a 689 triple in column 7 box 3, and 57 double in column 7 box 9 (since I know the value for the line is 12).

[@longwaytotipperary]

Fabulous Friday - 2 great Sudoku puzzles and a great Cryptic crossword puzzle! Enjoyed the live stream yesterday as well!!! Winning Monopoly in 2 turns????😮

[@davidrattner9]

Enjoyed live stream also my friend ...however it was Wednesday, not yesterday. 😉🫠🫠🤎💜❤️ Today's videos both amazing and can't believe about Monoploy. 😁😁 🤎❤️

[@Squishy3757]

Don’t beat yourself up Simon. You work through these puzzles every day.

[@alberttatlock1541]

I started with an attempt at SET. I am not usually good at spotting useful cells to select, but I happened to be lucky this time and found several of the 1s and 2s, and the 6789 quartet in box 6 quite quickly. The rest too me about 90 minutes.

[@ChicanoryIsMyName]

I thought there would be some sort of set coloring break in. But this, much more intricate. I did not get very far to say the least.

[@davardi]

One of the few times I solved it taking a different path than Simon. Without looking at the region sum line in Box 1 you can still deduce the sum of the lines in boxes 2,7 and 9 as they constrain each other.

[@zirua]

Lovely video. I wish you would share all your thoughts, even the ones you realized were incorrect. I learn so much from listening to you.

[@TheClawNinja]

We live in great sudoku times for sure :)

[@AndreAy1975]

Solved it with help from the video.

[@rampantunease6517]

What a beautiful puzzle

[@soocool78]

Simon -- i don't know if i'm alone in the thought --- but I really enjoy when you do 1/2 star puzzles. I have no chance of doing anything harder, and while I watch ALL the videos, I really enjoy it when I can solve something on my own, and then watch you do ti (or use you as a hint :D ). I know less stars means less chance of there being fantastic logic (though they do exist!), but I hope im not the only one thats ok with more "boring" puzzles that more people can solve along!

[@DungeonRutan]

Yes! Great ! friday soduko! And here I thought I was going to a party!

[@nicocost33]

NOT a must watch but a must DO. What a nice puzzle. 1.16.55 for me.

[@Apptelope]

I found the break-in by adding col 1, 4, 7 and box 6 into one set and box 1, 2, 7, 9 into the other. And then cancel everything out.

[@ilsekleibscheidel7219]

quite elegant, i had been searching sets for hours but could not find a good combination. Yours is excellent!

[@biaberg3448]

Only a genius can solve puzzles like this.

[@EkuuleusNorth]

got there eventually. great puzzle

[@bait6652]

Usu never see the comparable sets needed...but once simon starts hiliting parts of the shape ...i can usually continue the rest. Managed to see the right side but missed The left block which is also needed to see the shifting sums ...the interplay of the 4th sum Was awesome to DD the final shift.

[@BryanLu0]

41:19 I saw the break in but I had to read a comment to see that 12s were restricted in the top 3 rows

[@anashehsookezian4094]

Simon, I think sometimes you’re too hard on yourself! I couldn’t even begin to solve any of these puzzles you solve, oftentimes in less than an hour. You’re amazing

[@Ardalambdion]

I worked my *** off trying to use set theory to no avail. Trying to minimize one set of digits that equals the maximum set of digits an other place and all sorts of that thing.

[@aleksapupovac]

I think a much better way to explain the logic around 17:00 is to ask where light green digits go in box 2 and where do yellow digits go in box 9.

[@Max-ch9ov]

On the wall opposite of Simon must be a giant chart with all kinds of triangle numbers and waysbsudoku digits can sum up

[@ServantOfSatania]

Pure region sum line sudoku is starting to become sudoku version of odd string of digits in cryptic crosswords where it just screams set theory, though the lines that didn't quite get into the sets were doing some clever stuff as well

[@-ARatnakumar]

3 in the corner was available from 46th minute but Simon wanted to have it at the end I believe..... :)

[@BlueCyann]

I don't know how I got the break-in for this one. I'm usually terrible with puzzles like this, but somehow it clicked.

[@-xomen]

57:06 Sorry for the dumb question, but why was there confetti when Simon inputted in that corner cell?

[@studgerbil9081]

It's an older story on this channel. Someone was taken by the REM song "Losing My Religion", and the line "that's me in the corner" was replaced by "that's three in the corner".

[@gibbbon]

i watched the video until 41:20 when the idea of coloring the 1/2s "has done something" i tried it myself and indeed, everything unlocked from that point on and i finished quite quickly after that

[@thisnthat3530]

The way I started was noticing that 5 cells in box 6 "compressed" to 3 cells in box 9, then 5 cells in column 7 "compressed" to 3 cells in box 2, then 5 cells in column 4 "compressed" to 3 cells in box 7. This meant the 3 stages were equal to 15-18, 18-21 and 21-24 giving 3 degrees of freedom. I spent the next 90 minutes trying to find one more "compression" to eliminate those before giving up.

[@ilsekleibscheidel7219]

You shouldn't have given up.I also made this start. The 3 cells in box 7 together with r4c1 made my break in in about my fifth start, but this worked!

[@MarkBennet10001]

Had solved this and have managed not to record my solve - seriously good puzzle.

[@MarkBennet10001]

Absolutely "must watch" - really classy solve (as expected really) - that logic was not so easy to find, and my first solve was not so clean (but I did go back once I had found the clean logic, because I knew it would solve smoothly). To get that first time - you did it better than I did. Simon a few hundred, Mark, a few.

[@snuggie12]

Wait, I'm confused. Are there non "must watch" videos? Feels extraneous

[@RealCadde]

29:00 "What does that mean???" It means you need at least one more [789] cell in row 4. And it CAN'T go in R4C5 because it would make the total on that line in box 6 impossible. R4C6 is from [789] and R4C5 is from [12] and so R5C6 is from [45]. EDIT: And by the way, there's always a 9 in column 7 of box 3. Even if R4C7 was a 5, you still need a 22 sum in those three cells and for that you must use a 9.

[@kurtu5]

The first 6789 only fits in a domino in box 7 or else the equal sum breaks, and that fixes it in box 1.

[@psymar]

Mayfair is just Boardwalk in the original, not Boardwalk Avenue. The locations are all real locations in Atlantic City, NJ; their boardwalk is rather famous.