We Got An Email About This Sudoku... He Wasn't Happy...

[@PuzzleQodec]

Oh I'm so sorry Nigel! My goodness, 10 hours.... I promise my next puzzle is going to be easier!

[@pouletbelette]

I'm always very happy whenever one of your puzzles is featured, Qodec. Even when they're monstrously hard, because they always have beautiful logic in them. Great puzzle!

[@chameleon_yura]

Beautiful construction!

[@davidrattner9]

Just again an absolute beauty from you!! Such a privilege to see your mind at work!!

[@chitraagarwal8259]

Amazing construction.. Should be 4 stars.. I don't think it was so terribly monstrous but it wasn't easy either

[@longwaytotipperary]

@@davidrattner9well said, David!

[@bobblebardsley]

For those who prefer their rules to rhyme: To fill the grid, avoiding any shocks, in every row, each column and each box, insert the digits 1 to 9, once each (the rules that all Sudoku teachers teach). The contents of each killer cage are driven by adding up the cells to each clue given; and as you solve this mathematic feat, ensure each cage's digits don't repeat. Now comes the twist: dispersed throughout the grid, nine Doublers in the boxes are so hid: just one per box, per column and per line, and each a different digit, 1 to 9. When calculating killer cages' sums, each Doubler twice its value so becomes; let these rules guide you to the grid you seek, as you ascend Mount Elbrus to its peak.

[@sskar9390]

Yours is truly art!

[@Playmaker6174]

okay this is actually so epic, that makes my night a lot better haha

[@Millenassang]

I somehow began to go through the comment section and had to pause the video to read your arrangement of the rules, which is as usual smooth and very elegant. Ty!

[@pouletbelette]

Ok, now I'm convinced that Simon should contact you ahead of his recording and ask if you're up for translating the featured puzzle's rules for him so that he can read your version to us.

[@PuzzleQodec]

This makes me wish I could heart comments as well.

[@Showsni]

I like how Simon proves that the 17 cage in box 9 must contain a doubler that swaps parity when it doubles, then immediately forgets that and tests if doubled 4 would work. :) Great solve, though!

[@ElaHuguet]

Drove me nuts for a few minutes 😂😂

[@J7Handle]

4 is an odd number. Jk

[@ElaHuguet]

@@J7Handle yes, it's very odd that it's even.... Lol

[@Bluuuueee]

That's why we love Simon.

[@valentinagambetti167]

Hi Simon, I just wanted to say that I, for one, absolutely love the longer videos. I reach specifically for those when I’m going through hard times and need something soothing and grounding. In fact, I really needed this tonight, so thank you!

[@bodemeister118]

bodemeister here. I'm one of the commenters who found the puzzle "very enjoyable but also very straightforward solve." Super happy to see this puzzle on CTC and happy to brag about the rare occasion I solved a puzzle faster than Simon! Keep the good puzzles rolling!

[@solfeinberg8591]

It does feel straight forward when you start asking the right questions. Like if I summarized it or solved it a third time, I would agree.

[@heliocruz416]

Thank you for the shout out, Simon! I really appreciate that my birthday coincided with a hard puzzle (especially by qodec), which are my favorite ones to watch.

[@SourabhDas95]

Of all the halver, doubler, subtractor, nullifier, etc. sudokus that have been featured, this one stands out as one of the greatest balancing acts between its power as an additional region (or complete set of digits 1-9) leading to naked single eliminations, its row/column/box constraints for geometric/hidden single eliminations, and it's interactions with regular sudoku, for a indescribably satisfying resolution at the end. From my experience with trying to set sudokus, one of the big challenges near the end, is trying to figure out a good 'endgame' when you have 2, or 8, or 16 or 192 solutions, and the challenge there is trying to find a clever clue(s) to add that resolves all the deadly patterns, without compromising the logic leading up to that point. Usually, at this stage, you can use a solver as an aid to check the number of solutions, and the number of solutions gives an inidication of the number of unique deadly patterns remaining (e.g. if there are 16 solutions, then you'll often find there are 4 sets of deadly patterns, each one that needs some additional disambiguating clue, to get to a unique solution) What blows my mind in this puzzle is that the last sequence of disambiguations that happen, encompassing 4 of the 9 doublers, each one contributing to eliminations using its special status as a doubler, without which there would be deadly patterns and multiple solutions. I don't think I've ever seen a puzzle before where every doubler (or halver or generally 'special modifying set') contributed, and was REQUIRED, for the final disambiguation! Truly legendary!

[@livedandletdie]

It was truly a nice puzzle, and it was very straightforward in it's application of the Doubler rule, although daunting in the beginning, it wasn't too difficult at all, and it did lend itself to be a reasonable and enjoyable puzzle that used the logic of doublers throughout it all, to make the puzzle more beautiful, after all, there's way too many puzzles out there where the logic is only applied to half of the solve, and from whence one would have to do an awful lot of scanning and other deductions that wasn't based on the logic at all. Or worse, just fill in the entire grid afterwards like the miracle(anti-knight, anti-king, non-consecutive) sudokus...

[@HunterJE]

Simon wonders if there's a more natural way to see there must be a second doubler in blue at 23:52-the way I see it is the doubler in green rules out any more doublers in column 4 regardless of where it's placed, but you still need to place two doublers in boxes 5 and 6, and since they can't both be in row 4 one of them is going to have to be in blue...

[@GregJonson]

An easy one-star solve, you don't see many of those from Simon

[@barneytrubble]

Should have played that XTC song in the intro... "We're only making plans for Nigel. Nigel just needs that helping hand."

[@Silvergrooves42]

If you have time - check out the nouvelle vague cover of that song. It's absolutely mesmerizingly dreamy. Probably one of my favorite bossa interpretations of all time.

[@JaceMakes]

Love me some XTC

[@altreusplays]

Oh that was XTC! That song keeps popping into my head and I was never sure who it was by, but serendipity has led me to this comment and now I have regained the knowledge! Can't wait to forget it again

[@emilywilliams3237]

There have been a few puzzles by Qodec that I have been able to solve, and every one of those was very fun and interesting. This was clearly fun and interesting, as well - for Simon to solve! I love it when you chortle, Simon, over something that you have discovered, and I always notice and appreciate that you give so much credit to our excellent constructors for their imagination and genius. What a time we live in when so much amazement can be found in digits in a grid. Thanks for the video.

[@millstonebarn]

What a remarkable puzzle. Amazing work Qodec. (And Simon).

[@JPgreekgaming]

I'm with Nigel on this one. This was anything but straightforward lol!

[@In_TheMoonlight]

I really love these puzzles with simple and beautiful rulesets. They're just brilliant!

[@MarkBennet10001]

SET works with doublers too - you are taking the same thing out of both sets, and that includes doublers. It is akin to Star Battle logic too. Jay Dyer has used variations on this theme including in a puzzle hunt.

[@AngelWedge]

I was looking for this comment. That jumped out at me straight away, so glad I'm not the only one.

[@04LightningFan]

hmm... That makes sense, but I've got to think about it. Okay, I've got. because every row, column, and box contains exactly 1 doubler. Exact same logic. You are correct.

[@davidrattner9]

Great solve from you Simon!! Know how much respect you have for the phenomenal Qodec!! Treat for us as you pick your way thru this and showcasing his unique setting!!

[@tamaspolyak5564]

If the 39 cage contains a doubled 9, then the rest is 39 - 18 = 21. And the minimum sum of six different digits is 1 to 6 which is 21. So it's missing 7 and 8.

[@livedandletdie]

There was an awful lot that Simon didn't keep track of, and then he deduces stuff, and then immediately discards it, I bet Simon was awfully tired, when he solved the puzzle, because he's not usually this bad at deductions.

[@Swisswavey]

What a brilliant puzzle, I really, really enjoyed that. Most fun I've had in ages. Puzzle of the year so far!

[@acantilado]

How is this possibly a 3-star puzzle? Liar indeed! Very incredible solve and a great puzzle. Probably the best feature of the week

[@Robert_H.]

10:36 Simple stuff, no explanation needed. 13:28 Set Theory: Blue = 17 + 15 + 3 + 26 + 12 + 5 = 78 Green = 39 Blue - Green = 39 It should be 45. This means, that Green has a Doubler, because then it's Real Sum would be lower, and if the Real Sum in Green is lower, then Blue - Green > 39. If Green has a Double 6, then it would work out perfectly. But because of Sudoku Blue has at least one Doubler too (Double 1, 2 or 3). Therefore Green has at least a Double 7. 24:08 Blue has at least 2 Doublers. They have to be Double 1 and 2, because otherwise the Doubler in Green would have to be 10 or higher to get the difference Blue - Green right. The Doubler in Green is 9. 26:47 Positions of Doublers in Blue and Green lead to 8 in 8-Cage in Box 2.

[@gdc42]

I solved this puzzle a few days ago and was totally blown away by it. Very well deserved feature!

[@piarittersporn]

Quite difficult and very exciting puzzle.

[@titusadduxas]

OMG - That was gorgeous. I did start again after over an hour and a half when it crashed after I’d made a wrong assumption. Once I started again it still took nearly an hour and a half but I always felt I’d get there in the end, so very happy that I did. I especially loved the break in even though it took me ages to get my head round it!

[@ericpraline1302]

Lovely puzzle, and a very enjoyable ascent with excellent views from the summit. Relieved that it took me somewhat less than ten hours to get there. I hope nobody was making plans for Nigel ...

[@JaceMakes]

I bought Chants of Sennaar today after listening to you play it. I spent all day on it and still have plenty left. Thoroughly enjoying it just as much as I enjoyed your playthrough

[@chocolateboy300]

I finished in 177 minutes. This was a fun puzzle, with a wicked cool break-in. I'm usually scared of doublers as it is so easy to make a mistake or miss something. I was even more scared when I spotted Aad's SET trick 40 minutes in. However, that was pleasantly surprising. That was so cool the way the geometry worked. I think my favorite part was ruling out digits from the bottom right cube of the middle box, due to forcing two of the same digit onto the 39 cage. That was so cool to see. Great Puzzle!

[@mery1973able]

Brutal, but beautiful. And btw perfect solve by Simon.

[@MarkBennet10001]

This is a brilliant puzzle

[@mse326]

This was fun. Tricky to wrap your head around the opening but well telegraphed where to look for it so it was just a matter of figuring it out

[@OlafDoschke]

LOL, I misread the rules as: "However nice cells in the grid are doublers". I bet you Simon will call them naughty.

[@Ardalambdion]

They are nice because they add something extra.

[@AngelWedge]

Next variant: all friendly cells are doublers. That would be interesting :p

[@Anne_Mahoney]

@@AngelWedge It would be interesting. Would it be easier or harder? And wouldn't you need to have more than 9 doublers that way?

[@AngelWedge]

@@Anne_Mahoney I was thinking that using nice cells would replace the one per row/col/box rule… But now I'm thinking of a ruleset where cages show the sum of all the friendly digits in them, which might allow much of the same logic with slightly less mental arithmetic.

[@janerobson2297]

Anyone else thinking 'We've done the Ard bit. Now comes the Hard bit?' 😂

[@studgerbil9081]

I say this every week or so, but to me this was Simon's best solve yet.

[@ServantOfSatania]

66:26 For me, I was expecting it to be absolutely monstrous but it was actually quite chill

[@rohitraghunathan]

Around the 35-38 minute mark: The 5 cage in row 9 has to have atleast a 1 or 2, even if there are doublers. Since there are exactlye 2 sets of 1 and 2 in the blue region, and the 12 pair in column 9 is not a double, The 5 cage contains exactly 1 of 1 or 2, and it's a double Which means it's a 13 pair with the 1 doubled

[@HudsonHornet250]

I got the logic myself as far as placing the 8 in box 2 after the set theory placing the 1-2 doublers, however struggled to get much further than that. Definitely a puzzle I shall watch Simon solve as I drift off to sleep!

[@andremouss2536]

My very first tought about this is about the square 30 cage at the top right. If the total were genuine, if must be a 6789 cage, but it's impossible since there would then be no room for one of the digits 1 or 2 in box three. So one of the digits in that cage is doubled.

[@solfeinberg8591]

Mother, may I make 3 steps forward. No, you can make one small step. Very hard, but , in some ways, not really because I'm solving it sans video - up to 200 minutes. I feel they were mostly well spent. And very interesting logic. Combinations I've never seen before. I think this was a great puzzle. Make another one with similar logic and rules, so we can enjoy the flow but not have to work so hard.

[@Xelopheris]

Saw an interesting logic before the collapse at the end around 1:27:00. If r8c7 was the 5, then that would put a 3 in r7c7-8, but also put the doubler for box 7 into r7, where it could no longer be a 3.

[@megaminxpll]

@45:20 you can fill in the 9 in r4c5, since if you put the 9 in the 17 cage, the 15 cage will be 78, which leads to no fill for the 12 cage.

[@Raven-Creations]

You did say you were confusing yourself, and I think you were right. Blue had to have at least one doubler (in box 8). There can't be a doubler in blue in box 6, because it would have to be at least 3, reducing the digit total of blue to 74, which would make green need a double ten. Therefore the doubler in box 6 had to be in R4, pushing the doubler in the 39 cage into box 2. This forced a second doubler into blue, which therefore had to contain doubled 1 and 2, and the 39 cage had to have double 9 with 1-6 in the other digits. The 30 must include either 1 or 2, which means it must contain a doubler. The 5 cage must include a 1 or 2, and it must be doubled. It can't be double 2, because that would use up the remaining 1 in blue, so it's double 1 plus 3. 2 in box 8 must be in C4, so the 12 cage must be 48 or 57, which means the 15 cage must be 69. Suddenly, the puzzle starts to crumble. The only option for the 26 cage is double 2 plus 3469. The 34 must be in box 6, the 69 in box 8. If you work out the digits that must be in blue, it's easy to make the 17 cage be 458, which makes the 12 cage 57. The 15 cage must include double 3 (double 4 would require 7 more which would need another 4, and any higher doubler is impossible). This leaves 9 left, which can't include 3, so it must be a 1236 cage. The 19 cage can now only be double 7, 5. The rest was just sudoku resolving doublers which resolved sudoku. Rinse and repeat. I loved the way it all unwound at the end, with ping-ponging to resolve pairs, which then resolved a doubler, which started another ping-pong session, then another doubler resolved everything else. The Aad SET was thankfully telegraphed, or I don't think I could have finished it. Typically classy setting by Qodec, I was gripped the whole way through.

[@hilldaniel]

I do hope that Circle Sums will make it to this channel too.

[@francoisduez601]

76:33 for me! What a puzzle! Just glad I solved it, it's always a pleasure to be able to finish a Qodec sudoku!

[@crazypantaloons]

I'm just gonna say before I start, this looks VERY familiar. I'm optimistic!

[@crazypantaloons]

232 minutes, but I took an hour lunch break in there. Just under 3 hours. What a beast!

[@niverio8400]

I do not see the Jesper solve on Patreon right now, is it not out yet? I am thrilled to see you have solved it and cannot wait to watch that video. On the other hand, this qodec puzzle is also awesome so it's like a double present!

[@CrackingTheCryptic]

It should be out... if you can't see it please let me know and I'll look into it :)

[@zirco77]

Marvelous break-in!!! It was "easy" to spot when you have a bit of experience on such techniques (no spoiler here), but if you don't, I don't think it's possible to grind your way out otherwise. But even then, about every deduction in that puzzle was hard. Not "very hard", just "so pleasingly hard" 😏 Thank you @PuzzleQodec, that's a masterpiece of a setting!

[@CtC_Enjoyer]

I love watching y'alls videos during my 30 minute lunch breaks, so these longer-format videos don't fit (as I usually watch the hour long videos at 2x speed), but I still love watching these whenever I can!

[@jkid1134]

Great video, quite fun to watch you climb the mountain (I think the Ls are peaks? and maybe Elbrus is a clue, like "L"brus"? coloring is on theme for it anyway). A couple cases in this one where I think you're going slowly but then you see things I never would have, which is always a blast. o7 to the fella who didn't make it to the peak

[@PuzzleQodec]

Mount Elbrus has a double peak.

[@jkid1134]

@@PuzzleQodec ah! plays brilliantly too with the one peak that is double the other. love it

[@AndreAy1975]

Solved it with much help from the video.

[@Gonzalo_Garcia_]

33:08 for me. Well, I also didn't find it that hard, but it's definitely not a 3-stars puzzle. Anyway, incredibly enjoyable, loved it!!

[@leefisher6366]

15:41 - Simon, I get that it's a full set of the digits 1 to 9 that's in the blue in addition to what is in green, but why does that definitely add up to 45? Is there a 'secret' piece of Sudoku lore I'm missing here (😁) 29:21 - Aha, that explains it! I'm glad I'm one of your very special friends.

[@Kinada]

90 minutes. Really happy with that time. Had some trouble in the middle figuring out the last of the doubled digits and once I got that I forgot to do sudoku a couple of times but once I noticed I had digits looking at the things I was trying to solve it went smoothly from there. Wonderful puzzle.

[@Jigkuro]

Seems like the security certificate on sudoku pad just expired? Can't access the site now. 😢

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

45:58 for me. i was expecting something a lot worse. (NOTEBLOCK RECOMMENDED)

[@bait6652]

This is the first design ive been able to see the 4x4-5x5 (or 4Rv5C +45) trick...maybe cuz its more readily visible in this desigb .think ive watched 5-6 of these from simon... And never been able to see less remembwr it. Was able to. Deduce existence of 9-2-1 doublers..but not the location. Still wrapping my head around why there can only be 2 copies of each digit in this set repl type(other than the missing 2 for him to deduce that there cannot exist 3 ones or twos in the L which allowed him decude the sum5 had a doubler

[@EdithKFrost]

@22:31 there are EXACTLY 2 doublers in blue, which increase blue sum by at least 3; yet there is exactly one doubler in green which will get the difference between blue and green to drop by exactly six. Therefore the doubler in green is at least 9, but by sudoku it is also at most 9, so it is 9 being doubled in green and 1 and 2 being doubled in blue😂

[@KeiFlox]

I've only just started the solve, so maybe you switch colors further into the video. And Simon and Mark are both usually good about color combos and the colorblind. But red and green, Simon?! :P

[@OnAFitnessJourney]

Awesome puzzle, was able to solve in 1:30 min, inital idea was good but after somtime the idea of where the double 6 comes is insanley difficult to think of. Stuck for 10 mins there. Even after half puzzle is complete so many small observation needed to solve it.

[@matheuscavagna2128]

Cheers from Brazil

[@theashen]

I worked out the break in but this sort of solve eventually gets to just be a grind. Took too long to disambiguate 4,5 & 8 doublers and I gave up from boredom

[@PavelB123]

Is chocolate useful? I think so. You can eat it. Why does shaping it like a tea pot make it useless? "As useful as a chocolate tea pot." Well, if you have no uses for it give it to me, I will eat it.

[@GuardOfGaia]

I've often made that comment regarding the other "useless" chocolate item - chocolate fireguard - assuming it's proper chocolate at 70+% cacao. I suspect also Simon's little person would also agree.

[@anaayoung9142]

Very good puzzle to have a set! Not easy for me at all so I didn't even try it! 😅

[@JalebJay]

44:59 found the set/math quickly. Though, doing it was sorta tricky.

[@loralogue]

Looks like the site's certificate expired so it's blocked on both firefox and chrome.

[@loralogue]

And we're back!

[@smylesg]

Simon could have delineated the sets with a colored border, and then used his typical red-green coloring for the doublers.

[@pablodeci5487]

The conclusion at 25:00 that there were two doublers in blue was way mor straight forward it just follows from the set equivalence: at first you highlighted a total of 3 doublers in green and 4 in blue and the deleted the same amount of doublers from both so blue has one more doubler than green. I've always thought it would be a good idea to set a puzzle exploiting that idea of using set equivalence on the number of especial cells maybe it was the intended argument

[@F1r1at]

Took me 70 minutes. It's not that hard, but only if you know and can see the set trick. I knew it'd have to have one, so I looked in the video to see what exactly will it be, cause I never see those things just by myself. After that it was pretty straightforward, but still not easy, you need to see quite a lot of stuff.

[@Grumpy_Granddad]

I have a feeling that Simon missed the doubler positioning assisting where the purported doublers live - still a good solve

[@andremouss2536]

57:00 so Qodec may even have given that L shaped box without the 26 clue !

[@andremouss2536]

Oops the 26 value had already been used, sorry...

[@livedandletdie]

Simon it was a very straightforward solve, there was a bit of deductions needed, but other than that, it wasn't too difficult. I got under an hour to solve it, myself, 45 minutes, but yeah. Other than the SET in the break in, it wasn't too bad. It wasn't that it wasn't difficult, it was just a lot to keep in your head. And your tiredness did show, in your solve, especially when you did deductions and then immediately gave up on them. Ahem 17 cage...

[@Nekromant05]

Am I the only one who gets crazy about the pencil marked 9s in a five cage?😂

[@austinsinger7565]

@33:22 that 30 cage. You can use the numbers 6, 7, 8, 9 for 30 and those are not 1's or 2s. Oh nvm, I get what you were saying.

[@andremouss2536]

23:50 I may help you there : where is the doubler in box 6 ? It cannot be in the blue region since it then would be at least three, ant that's too big since there is another doublet in the box 8 blue region, that wold make four at least and that's too much since it pushes the overall correction (between green and blue) to 10, and that's not possible since ther is only one doubler in green to cater for the correction. Hence there is no doubler in box 6 blue region, and thus a doubler in row 4 of that box. So there is a doubler in box 5 green region (since there cannot be any in row 4 or column 4), and that makes two doublers in all in the blue region. Thus these doublers are 1 and 2, and the doubler in the green region is 9. Phew !

[@tired_3im]

You did it, Sam. The video is out 🎉

[@Tepalus]

Well, now I want a constructor to create a SetUponSetUponSet Sudoku. Let's gooo! :D

[@TockProductions]

Shall we call these doublers "Irish" or "Lucky" cells? They really do be Dublin

[@phuybrechts6875]

Pencilmark the green region Simon .so you see where 7/8/9 go in box 4 .so you can see some x- wings😂

[@sofiarocha9907]

Patiently waiting for him to realize that the doubles can only be inside the cages...

[@hooded0166]

This the way I interpreted the rules, as well. The 2 cell 3 cage and the 3 cell 6 cage obviously cant have a doubler in them. Just started my atempt on this one, so wish me luck.

[@karlmortenlunna2417]

What a beautiful puzzle. And very hard! 43:05 for me today.

[@chipsounder4633]

39 today 🎉 been a good one.. got to go to work now though 😂😂

[@PuzzleQodec]

Happy birthday!

[@johannygren116]

Question (with a bit of a prelude). I got stuck on the beginning as I didn't want to unmark box 1 as it contained a doubler and I couldn't convince myself that didn't matter for the lower area that contains 2 doublers. It was when I realized that the doublers there was 1 and 2 and that those are included in the 39-box that I could drop it. Simon's solve doesn't take this in to account, did I worry for nothing or could that have become a problem in Simons solve if it wasn't the case? Maybe it's just a refrasing, 1 vs 2 doublers must solve 6 in difference?

[@deathpigeon2]

this *does* solve like a swiss watch. this just doesn't make it easy.

[@Cecekcz]

"This one might be easy" Simon says with 80 minutes in the video remaining.

[@BongoBaggins]

This one was easy. I pointed my phone camera at it and it filled in the missing numbers in a couple of seconds. Saved me an entire afternoon

[@TurquoizeGoldscraper]

69:13 for me - I got stuck and needed a hint from Simon (where's the double 6?)

[@dallium01]

So I've noticed that when Mark and Simon get a digit that resolves a pair (that they notice), they always always always fill in the corresponding digit first, ie When Simon placed the 2 in r6c6, the 1-2 pair in c9 was resolved, and Simon filled in the 2 before the 1. I always always always resolve pairs the other way around, perhaps because I learned using adaptive pencil marks, which would have noted that r6c9 was down to just 1, while r5c9 technically still had 1 and 2 as candidates. We should assume that Simon and Mark are indescribably better at Sudoku than I am. So is this just a difference of convention that doesn't matter, or is there some weird, esoteric mathematical proof that says their way is better than mine and I'll be a better solver if I switch?

[@kf7872]

I've noticed that. Wondering if it's because they're looking for what can go in cells, rather than what can't go in cells. E.g. phrases like 'where does the 3 go in line 5'.

[@andremouss2536]

Why is this silly Snyder 9 staying for sooooo long in R6C5 when Simon states repeatedly there cannot be more than two nines in blue ?

[@Koushakur]

That a doubler is allowed to exist outside a cage is profoundly ugly, how is it a doubler if it is outside the context that makes it do anything at all?!

[@markp7262]

Simon, when doing this particular set theory, why do you not put box 1 in green? You only force extra work with math, when green and blue would be exactly equivalent if you added box 1. @24:00, you were contemplating the number of doublers in blue. Since you need a doubler in box 1, and one in the 39 cage, therefore there also have to be two doublers in blue. One of them is in box 8, the other to be determined. EDIT: @53:30 the easy way to solve this part is to consider the 26 cage. It has a 9 in it. If it didn't have the double 2, it would be at least 3-4-5-6-9, which is 27. Therefore, the double 2 is in r6c6. The only way to complete the 26 cage is now d2-3-4-6-9, and you can place the pairs (6-9 in box 8, 3-4 in box 6). You still need two 5s in blue, and box 6 blue is full. Therefore the 12 cage has to be 5-7, and the other 5 is r5c6.

[@theredstoneengineer6934]

137:49 for me

[@stevesebzda570]

@38:19 Did Simon say, "there's only one 7 and one 8?" Then that "15" cage is not 78 (

[@stevesebzda570]

Well, the 78 can be there (but no others would be 7 or 8). Hmm.. Go to it, Simon . (Whatever you're adding together -- I can't keep track) 😂

[@robertcotton8481]

Sven any chance for a zoom option on app hard to attempt puzzles on phone when can't zoom in to see numbers

[@LednacekZ]

46:31 for me. this one was very hard.

[@thielbbs]

I don't get it..please help: at 28:56 Simon says that the the green cage is a set of 1-9 except 8 and 7. Good. But I dont Unterstand why the blu zone must contain every digit twice except 8 and 7. I think that the blue zone is 30 (green cage) + 45 = 75 in total. Why cant this 75 in the blue zone made with others digits. I am lost here and would be happy for a more detailed explanation. THX

[@GarthTarris]

The green cage is 39 with a doubled 9. Take 9x2 from 39 and you are left with 21. You now must fill 6 cages with a sum of 21, the only way of doing it is 1 2 3 4 5 6. So 7 and 8 are left out of it. Due to SET you also know that blue is whatever is in green plus one extra set of the digits 1 to 9. So you get only one 7 and 8 since they are not in green.

[@NaHBrO733]

I was stuck at the part 1:07:31 in the video Why can't that top right cage have a 3?

[@NaHBrO733]

I got it lol, the 1 2 double in box 6, one of them must go into the 30 cage

[@bobh6728]

Simon short-circuited figuring out box 9. Three even digits in row 9 and he spends time trying to figure out if 1,4,8 would work for 17 cage. Knowledge bomb-that would be 5 even. Of course he did mentioned he was a little tired. Just glad that only added a minute or two to the solve and not 10 hours!!

[@nicholaszimmerman5380]

I am confused on the logic at 1:05:00 ish. Why can the 30 cage not be 378 with a doubled 6? Simon forced 9 into r9c789 and 3 into r9c23. Obviously this leads to the solution, but was this a lucky moment where he missed the 3678 possibility or am I just not grasping the logic?

[@Lorenc7]

The 12 pair in box 6 forces 1 and 2 into columns 7 and 8 in box 3. If both 1 and 2 go in the top row, you cannot fill the 6-cage in box 1. If both 1 and 2 go in the 30-cage, you cannot complete that cage. Therefore, the 30-cage includes either 1 or 2 (not both), which means it cannot be 378 and 6(doubled).

[@nicholaszimmerman5380]

Right right. I think after looking at this one for a couple hours and then referencing the video to figure where I went wrong, I was just kinda braindead lol Thanks for clearing that up.@@Lorenc7

[@letsmakeit110]

10 hours? that's it? i've burned 2 weeks and 600 lines of python code on a phistomefel. but yeah this community loses perspective sometimes on what they consider "approachable". Seen a puzzle with 10 different line types and ppl comment 'this would be perfect for a beginner!'

[@jonh6585]

By the time you put ten lines in a puzzle the digits are probably so restricted as to solve itself 😜

[@letsmakeit110]

@@jonh6585 iirc they were each 4 cells in length

[@emdiar6588]

3 stars, my a*se!

[@Czeckie]

when you say 5 stars and 100% difficulty, what does that refer to? where can i access the rating?

[@sskar9390]

Logic Masters Germany

[@StormCrow42]

Logic Master's Germany

[@Czeckie]

@@sskar9390 thanks! I've noticed that lot of the puzzles are entered into the sven's sudoku pad. How can you do that?

[@Armoterra]

At around 1:16:05, I think using uniqueness is a valid deduction. Why is it taboo?

[@steve470]

Because some solvers (including Simon) prefer to prove that the puzzle has a unique solution. Using uniqueness in the solve assumes that the puzzle has a unique solution instead of proving it.