The River: A Sudoku Masterpiece

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** BONUS ALERT **
We've released Simon's solve of Phistomefel's ♫ Slitherlink take me home ♫, an April Fool of the rarest and most wonderful kind. Link below:
• Phistomefel's April Fo...
At 4pm UK time today, we also released on Patreon a new Sudoku Hunt by Qinlux. There will be a prize (and shoutout!) for the first correct solution received and everyone who sends us a correct solution will be in with a chance of a prize too. Closing date 5 May 2022.
/ crackingthecryptic
** TODAY'S PUZZLE **
Sorry that today's video is another long one. Simon attempts The River, a simply astonishing puzzle by Jakhob and wooferzfg (whose birthday it is today!). Give it a try at the link below:
app.crackingthecryptic.com/su...
Rules:
Place the digits 1-9 once each in every row, column and region. Regions must be determined by the solver and each region is an orthogonally connected group of 9 cells. Regions cannot overlap. Digits on the blue line have an equal sum N within each region it passes through. If the line passes through the same region more than once, each individual segment of the line within that region sums to N separately.
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Опубликовано:

21 апр 2022

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Комментарии : 163

@wooferzfg 2 года назад

me and Jakhob were really proud of this one. thank you for the wonderful birthday present! 🍿

@gregdyck7893 2 года назад

Happy birthday! And thank you (and Jakhob and Simon) for giving us the phenomenal gift of this puzzle and it's solve.

@longwaytotipperary 2 года назад

👏

@grimsqueaker5333 2 года назад

Happy birthday. Your name reminds me of the line Terry Pratchett likes to write when a character wakes up: 'Wstfgl". Thank you for a great puzzle.

@Hamsda77 2 года назад

congrats on another CTC feature and happy birthday! it feels weird seeing your name in a context other than speedrunning, but this is a brilliant puzzle, bravo to both of you

@jbruuuu 2 года назад

Had so much fun solving this one! Thank you!

@rorojogarcia2311 2 года назад

"Whether red is red or whether red is green, red has still some growing to do" 51:32 I love this channel

@caitlinerickson7355 2 года назад

My new favorite Simon sentence

@ronmosenzon4933 2 года назад

I really liked "if purple is not yellow, then what is purple but green?"

@inspiringsand123 2 года назад

Let's Get Cracking: 05:31 Simon's time: 1h18m43s Puzzle Solved: 1:24:14 What about this video's Top Tier Simarkisms?! Bobbins: 4x (11:50, 30:47, 1:04:52, 1:04:52) The Secret: 3x (10:59, 11:03, 43:16) Phistomefel: 2x (01:43, 01:59) Schrödinger Cell: 2x (35:24, 1:01:30) And how about this video's Simarkisms?! Ah: 17x (06:01, 11:55, 18:01, 25:45, 25:45, 31:44, 33:50, 37:47, 42:41, 49:14, 49:21, 52:41, 56:43, 58:52, 1:14:50, 1:16:45, 1:19:35) Hang On: 11x (11:57, 13:11, 13:11, 13:11, 13:16, 23:31, 23:31, 23:31, 49:14, 50:55, 1:01:07) Obviously: 8x (19:48, 22:09, 34:42, 50:31, 1:01:53, 1:01:53, 1:06:19, 1:24:10) Surely: 7x (09:22, 10:39, 11:36, 17:19, 28:28, 51:34, 1:11:53) Beautiful: 6x (26:37, 27:10, 42:55, 1:15:33, 1:15:36, 1:22:06) Brilliant: 6x (00:38, 01:16, 22:24, 1:23:33, 1:23:54, 1:23:58) By Sudoku: 6x (20:36, 22:27, 34:13, 44:47, 47:07, 56:45) What on Earth: 3x (39:28, 1:14:05, 1:15:55) Clever: 3x (18:08, 21:02, 43:58) Incredible: 3x (01:43, 02:06, 02:08) In Fact: 3x (07:42, 57:12, 1:14:20) Progress: 3x (49:43, 58:18, 1:03:32) Wow: 3x (1:06:05, 1:06:05, 1:20:27) Naked Single: 2x (1:18:58, 1:19:35) Nonsense: 2x (13:57, 48:37) That's Huge: 2x (15:13, 28:25) Good Grief: 1x (29:33) Useless: 1x (09:43) Sorry: 1x (1:01:32) Bother: 1x (25:23) Stuck: 1x (19:27) Lovely: 1x (16:53) Ridiculous: 1x (00:35) Going Mad: 1x (39:56) Come on Simon: 1x (05:37) Irritating: 1x (56:04) Magnificent: 1x (1:23:45) Think Harder: 1x (1:06:09) I've Got It!: 1x (29:57) We Can Do Better Than That: 1x (1:03:05) Chromatic: 1x (18:32) Nature: 1x (02:03) Cake!: 1x (01:18) Most popular number(>9), digit and colour this video: Fifteen (76 mentions) One (114 mentions) Green, Red (89 mentions) Antithesis Battles: Low (2) - High (0) Even (9) - Odd (0) Higher (3) - Lower (0) Black (3) - White (1) Row (20) - Column (12) 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!

@jpatrick1967 2 года назад

Ok…Simon revealing that he’s white water rafted in the Zambezi River in Africa makes it clear to me that we need a prequel movie to Cracking the Cryptic with Simon and Mark as some kind of 30something Indian Jones characters solving puzzles all over the world while fighting sword wielding fiends.

@YonatanZunger 2 года назад

At 1:08:00, a simple proof that purple is green: if it weren't, we would need a two-cell green domino adding to 15. But green is already using both 7 and 9!

@Bobody770 2 года назад

Or a 1 already in green. Leaving no room for 3 digits to add up to 8

@penningmeestercgkdelft9159 2 года назад

Indeed!

@penningmeestercgkdelft9159 2 года назад

And also, a 9 could be pencilmarked in the domino r9c5 / r9c6, which should be then picked up by green, which it can't do.

@SpeedyBozar 2 года назад

The solving of this puzzle went unusually smooth. Everything was getting clearly revealed one step ahead without getting me stuck anywhere. Actually it truly felt like swimming in a river.

@HunterJE 2 года назад

"I need to catch a train in 40 minutes" (looks at runtime) Uh-oh...

@doncook4097 2 года назад

I’m just amazed by “build your own regions” in last couple of weeks. I think it proves that this variant should be in the next book and a new puzzle app type. Bravo

@coherentramblings7326 2 года назад

“Whether red is red or red is green, red has still some growing to do And red is still not blue” Beautiful poetry

@kevink9985 2 года назад

57:53 The elegant way... If green did not take the red region, red would be forced to extend to bottom-right corner forcing a 1-2-3-4-5 on the bottom-right line, but is ruled out by the 1-2-3 triple in column 8.

@stormd 2 года назад

I saw this slightly differently. If green doesn't take the red, there's no where for the line to leave/reenter the red region to create a third 15-sum line segment, so it must therefore take the 2 non-line cells in the corner, but since they are in a 123 triple, and only one other non-line cell is available to red (r8c7), it would have to equal 10+, breaking it.

@longwaytotipperary 2 года назад

Looks like a dragon attacking a submarine to me. Looking at time - popcorn + 🍷as I soothe out the day/week with Simon (and all the rest of you out there watching/listening) Cheers!

@stevieinselby 2 года назад

At 38:00, the orange region already has digits adding to 30 on the line, so the remaining 15 in the region must either be _all on_ *or* _all off_ the line. That means they either have to be the 2×2 containing the given 2️⃣ _or_ the run of four non-line cells starting below the orange 1️⃣ ... but that would isolate the new yellow into a 3-cell region, so it can't be that, orange must take in the 2×2 containing the given 2️⃣.

@guitartailor 2 года назад

I always enjoy attempting to exercise the 4 colour theorem and use only 4 colours for the regions :) Wonderful puzzle hats off to the setters!

@Jaze327 2 года назад

I'd love to see a chaos construction puzzle with an additional rule for Simon. 'Color the regions in such a way that only four colors are used, you may not change the color of a cell once it has been colored. Additionally, you must color a cell once you know another cell that that is in the same region as it.'

@wooferzfg 2 года назад

there's actually a Chaos Construction puzzle based around this concept - check out "Four Colour Theorem" by Jay Dyer on Logic Masters Germany!

@simonalbrecht9435 2 года назад

You can't just do it in any puzzle though since you don't know right away which regions touch each other and which don't.

@piarittersporn 2 года назад

The second puzzle this week, which I had to give up with regret, but I'm learning a lot in this channel with all the beautiful, exciting and sometimes confusing puzzles.

@Jodawo 2 года назад

That was a very good puzzle. Genius setting. Those two constraints worked so well together. Simon got through some of the most difficult logic without a hitch but did make a meal out of some of the simple ones. I just chalk it up to being stuck on the constraint and forgetting about the Sudoku. Very entertaining video. The time does fly and you don't even realize you've been watching for over an hour.

@perladel95 2 года назад

1:08:54 That info about 9s was actually very useful considering that every region must have a 9

@stevesebzda570 2 года назад

I agree. @about 1:16:38 That 9 info was very useful [Those 9s down in the red region in row9 meant that it COULDN'T be that blue 69 ] That's what finished it for me [Other than yellow needing a 4 which was 1st] Yeah, that 9 info was very useful. I agree

@icedbear 2 года назад

Yes, you'd know that green can't extend past the 9, as it already has a 9, and that 9 can't be yellow, so yellow has to take the blue 9.

@Coyotek4 2 года назад

52:23 ... the epiphany (regarding the sum) came quickly; after that came some astounding logic. I'm left speechless ... in the good way! Just ... WOW!!!

@gawen6489 2 года назад

1:07:50 interesting Simon argues he cannot disprove a green region with two 1s in it (1 to make the 8 and 1 in the 1-5 pair already marked)

@Spoof10 2 года назад

You don't even need to do the maths on it like he did. If purple was not green, then green would have a 2-cell sum on the line, however, there is a 7 and a 9 in it already.

@onijester56 2 года назад

I mean, that dis-proof requires using Sudoku. And what type of fool would use Sudoku to solve a Sudoku puzzle?

@ThomasFjeldbonde 2 года назад

Thank you for a wonderful channel… Had never done other than Normal Sudokus before my brother introduced me to your channel… Now I am doing my best to keep up with your solves every day… This one was the first time I ever beat your time after probably more than 100 attempts… Loved this Sudoku!… Thanks again!

@goleyeath 2 года назад

Wonderful puzzle that was a joy to solve. Equal sums is quickly becoming one of my favourite variants, and this puzzle is a great example of why that is. Great work!

@th.nd.r 2 года назад

Absolutely incredible. HBD wooferzfg! Great setting, the originality to make something of this ruleset is so cool, and the logic behind it is stunning moment after stunning moment. Wonderful solving as well, I never would’ve attempted this, well done Simon!

@chessburns 2 года назад

Keep the long videos coming please! Absolutely love the build your own region sudokus like this 1. Unique and absolutely elegant.

@alvoi4379 2 года назад

I love seeing your videos Simon, your speech is always a pleasure to listen to!

@zetamathdoespuzzles 2 года назад

This is really an A+ puzzle. Great to se this on the channel!

@Gonzalo_Garcia_ 2 года назад

This was brutal… So I did solve it, but I don’t even know how long it took me. The thing is, I found the break-in pretty fast, then immediately placed one color wrong and spent like probably around 80-90 minutes trying to solve an unsolvable puzzle (from that position). I gave up, reseted it and only when restarting from scratch I noticed my mistake. It took me 30 minutes to finish in that second attempt, but the overall time is somewhere above 2 hours.

@mattmayoh9680 2 года назад

Similar for me, a silly error turned a 35-40 minute solve into a much longer one. I reached the same point as @35:00 in the video, and my next step was what simon did at the hour mark, that the orange region needed 2346, either all on a line together, or all off the line. If all off the line, yellow is walled in, so I completed that orange area much earlier, and pencil-marked the bottom left of the grid. But somehow looked at r89c2 and rather than saying they can't be 34 to give a 15 pair, I marked them as a 34 pair, to go with the 34 pair I already had in r45c2. Took me another 20+ minutes, including logic based on green already having 3479 in it, to realise things were very broken and have to do a lot of rewinding. The logic even looked intended, as if r8c345 were green, they needed an extra cell, as r8c3 would be 2, r8c4 would be 5 or 8, and r8c5 couldn't be the 5 or 8 required for a 3-cell sum thanks to 5 & 8 being 2 of the only digits I knew in the column.

@AurelUrban 2 года назад

oh nooo those kinds of mistakes are the worst :D happens to me more often than Id like. At least you only spent 2 hours on it, that's how slow I solved it normally :D

@z-beeblebrox 2 года назад

45:45 hmm...what should we call a Swordfish in chaos constructions? A Narwhal? XD

@ericpraline1302 2 года назад

This was a brilliant puzzle, particularly the break-in, but I found the latter stages mind-crunchingly difficult.

@chipsounder4633 2 года назад

Snacks, beverages and 90+ minutes of incredible logic, humour and joy. Love this channel more everyday.

@Rangsk 2 года назад

This is an astounding puzzle and I loved solving it on my stream! I'm not sure what I like more - the elegant break-in or the follow-through. I'm so glad you also enjoyed it :) Regarding the timer: I believe it has an idle detection and auto-pauses.

@chipsounder4633 2 года назад

Plus add the couple of minutes beforehand explaining the rules.

@killroy42 2 года назад

In fact, it matched the video time pretty closely! Simon sometimes doesn't give my software enough credit!

@Jukka70 2 года назад

Fantastic Puzzle! Absolutely loved it, great way to end the week. and I love long puzzles

@penningmeestercgkdelft9159 2 года назад

Irregular sudoku with determining regions is always fun - and certainly this one! However, the greatest suspense of this edition was actually not how to solve the puzzle, but whether Simon would be able to let the puzzle go and get his train, or whether he'd forget about the train altogether ;-) (The timer's conclusion of 86 minutes seemed reasonable - the youtube movie is 84 minutes.) By the way: have the colours been made a bit brighter lately? It is much easier now to distinguish them, I can say. Especially the difference yellow/green is now much better to see. But after all, it should be able mathematically to colour an entire grid by using just 4 colours as a theoretical minimum ;-)

@KaiSteinbach 2 года назад

30:43 "So this is a NEW colour, that shall be ... Oh, bobbins! Aeh. [..] How do I always get myself in this pickle?" - TIP: simply release each color once it has fully served its purpose. Here: once the region is done, the color should be freed up again. See the Yellow, Red and Purple areas - turn them white (because they are done and have a marked outline), and now you have 3 fresh colors available!

@davidrattner9 2 года назад

More popcorn to start the weekend. Beautiful puzzle indeed and happy bday wooferfzg

@wooferzfg 2 года назад

thanks David!

@77kaczka77 2 года назад

Wonderful puzzle! Congratulations

@AurelUrban 2 года назад

I was completely stumped at the beginning, it took me hearing Simon say "some regions have all the numbers on a line so N has to divide 45" and after he said that the solve was pretty straightforward. What a break in!! And every step afterwards flowed so nicely. Like a river ^-^

@kevinmartin7760 2 года назад

56:41 The red region can't grow "like that" because the two non-line cells lower left would ave to sum to 15, and can't be either 7/8 or 6/9. The region could take R8C7 instead of R9C7 giving it another non-line cell to contain part of the 15 total, though. Later on using Sudoku you show the two lower right cells are both 1/2/3, so even if the red region took R8C7 instead of R9C7, it could not work because with two of them summing to maximum 5 a third cell could not raise the total to 15. 1:07:47 The green region can't take the three non-line cells in row 9 because they would have to sum to 8 and so contain a 1 but the region already contains a 1/5 pair.

@johnh2052 2 года назад

Another way to consider the proposed red section in the bottom right corner is that it would include a 5-cell segment, which would have to be filled with 12345, leaving 78 for the very bottom right where they are impossible.

@philipcoltharp918 2 года назад

Simon, thank you for using such interesting words. You increase my soduko and my vocabulary.

@lunardancer6047 2 года назад

Once I got the starting clue from Simon I was able to solve this. Until then I just stared at the puzzle for 10 minutes not having any idea how to even start.

@Sponsie1000 2 года назад

yeah same, l didnt know where to start at all, especially since N wasnt even given... Although it was quite informative to see Simon figure out what N must be because l felt it was pretty intuitive in hindsight (although that goes for a lot of things)

@sakkikoyumikishi 2 года назад

Infrequent reminder that green right next to red is *really* not good for colourblind viewers. The puzzle looks great and it was very fun to come to some conclusions at more or less the same time but through entirely different reasoning. I enjoyed that a lot ^^

@joshsimpson1283 Год назад

This might have been my favorite puzzle I've seen

@longwaytotipperary 2 года назад

Happy birthday wooferzfg! Thanks to you and Jakhob for the great popcorn puzzle!!! 🍿

@wooferzfg 2 года назад

thank you!

@masu33 2 года назад

Could you elaborate on the "There are definitely crocodiles in it!" part, Simon? :) @7:50

@davidlefevre7 2 года назад

Well it's all denty ain't it?

@stephenjames2951 2 года назад

Always enjoy Simon working out regions.

@prahas777 2 года назад

Brilliance all around, again!

@stephenmccarthy1795 2 года назад

Mild mannered Simon talking about rafting with crocodiles.

@balkthor 2 года назад

I shall enjoy my dram of Dalmore 12 year single malt whilst enjoying this relaxing video.

@longwaytotipperary 2 года назад

cheers!

@allysonhebrard5367 2 года назад

Simon wishing me a happy birthday has definitely made this the best birthday ever

@olivierrustat6794 2 года назад

Definitely amazing!

@msolec2000 2 года назад

"Oh, that was easy", says Simon, and for an encore, goes on to prove that red is green, and gets himself killed at the next traffic light crossing.

@ymiros0953 2 года назад

Don't worry Simon, I have a red-green weakness, so I always knew red was green :D

@timking4625 2 года назад

Brilliant puzzle!

@minway3829 2 года назад

Interestingly, the last sequence Simon put in was actually the midway revelation I needed to resolve the puzzle. I hit a point where most of the top and left were done but the bottom and right were stuck. I realized that the bottom left only had digits remaining for either a specific 3 sequence or a 4 sequence, but placing the 6 for that region made the 3 sequence impossible, which then caused the rest of the puzzle to fall in line.

@Swisswavey 2 года назад

Wow. 87 minutes and I feel like my brain has had a real workout. Lots of fun though. Great puzzle.

@Thurhame 2 года назад

I can't believe it! I actually beat Simon's time for once! (clocked in at an even 1h05m) I'm so proud of myself :) The early parts of this puzzle were simple and fun. It started to get interesting after I had four regions complete and parts of three more marked; I had to take a step back and say, "either r3c8 or r3c9 must belong to an eighth region, and r9c3 must belong to a ninth region. With all 9 regions (at least partially) marked, the only region r7c3 can reach is the central region."

@hidalgobuscato7957 2 года назад

Now I'm wondering if someone can locate Simon's house using clues in this video: - he takes a train for a lunch, and returned about five hours later - sounds of planes passing (calculating the air density delay!). So must have a flight map of that day (and possible departure delays!) - he take a train from a train station that connects with London Good Game!

@5t757 2 года назад

There are a few online news articles about the channel's success and they mention he's in Reigate

@hidalgobuscato7957 2 года назад

@@5t757 thank you. But I'm not interested in others privacy, but in logical thinking! I'm aware that my first comment, accidentally, touches Simon's privacy. But it isn't intended!

@HunterJE 2 года назад

1:01:45 The even easier way (imo) is to remember that you have two completed 15-sum segments and a third necessarily gets you to 45, so you have to reach your 9-count using only cells on the new segment and are forced to take that whole 2x2...

@ronmosenzon4933 2 года назад

1:21:53 I found it really funny with the "absolutely beautiful logic" comment on the 8 having to be green when the 8 literally has no other possible region to connect to. It's alright though Simon I get you were probably pretty tired after than trip to London :) Regardless, I really liked this video. Absolutely beautiful puzzle.

@kmjohnny 2 года назад

Me: Wait, how do I start this puzzle? Video length: That's the neat part, you don't.

@specialkalberta 2 года назад

42:00 Simon should've said "Hello and welcome *back* to Cracking the Cryptic"

@Bardathe111 2 года назад

I think there’s a simpler way to determine which of either the blue or red regions would join to the green region. At some point you placed a 4 into one of the non-line cells next to the blue region. In order for blue to be part of green, it needed to take that cell (which I believe you determined earlier), but by that point green already contained a 4.

@lukeritchie8918 2 года назад

Glad someone else noticed this, I was begging Simon to notice haha. I suspect if he hadn’t had the break in the middle he may have noticed

@debrawilden1971 2 года назад

(General comment regarding the coloring of the sections--in this puzzle and any others like it-Every section does not need to be a 'different' color. If you choose only 3-4 colors, the grid would look 'cleaner.' But I think Simon likes the multicolors.)

@stevieinselby 2 года назад

If N=45 then all cells _not_ on the line would have to be in orthogonally connected 9-cell regions, and r9c1 shows very easily that that is not the case!

@Stylpe 2 года назад

But the line could pass through a region only once or twice, though, right? So r9c1 would just need to be one of the leftovers in such a region, which seems possible at a glance.

@mattmayoh9680 2 года назад

The last 20 minutes of the video are much simpler if you look at the line. @1:05:00, can r9c8 be red? If it is, you have 4 cells with a minimum sum of 18. So there is a border there, and now r89c9 must also be in that same region as r9c8. r9c8 must take at least 2 more cells on the line, as it can't have a 69 or 78 pair. r8c3 is a 2 or 3, so also must take at least 2 more cells. That leaves a single white cell on the line, r8c6, it obviously can't be 15 by itself, so must attach to either r8c3 or r9c8, and it's easy to see which one. Which makes the remainder of the puzzle much more straightforward.

@mattinm 2 года назад

1:05:38 … You have an X-wing on 1s in R8 and R9 via C2 and C9. Therefore the only way yellow can get a 1 is by getting the 1 below orange. Likewise, you’ve shown red cannot get the 1 from C9, therefore red must be the same as green and blue must go under red and collect its 1 from C9 or join yellow and a new region grabs that 1.

@Ulija100 2 года назад

Video break more than forgiven - this one took me multiple days of steady progress. Amazing! Absolutely a masterpiece!

@solfeinberg437 2 года назад

The logic determining that N = 15 was really insightful. I had to get that part from Simon. What was that logic? Each line has parts that are on or off the river. It had to do with yellow - which we determined had all of it's parts on yellow. That left a*N = 45 = 3*3*5. Where a is the number of different places yellow was on the river. Choices for N were 3, 5, 9, 15, 45. We already knew N was at least 10. And N couldn't be 45, I'm thinking because the number of cells on the line would have to be a multiple of 9, since each region on the river would have to be entirely on the river (and in one place). Anyway, that and a couple of other nudges let me solve it. It's crazy how all these puzzles have different logic and also crazy how Simon figures them out. I'm getting pretty good (confident anyway) but I can't keep coming up with all these insights.

@josephrion3514 2 года назад

Thirty minutes in I am like blue is an option. Also I saw the five looking up into purple region minutes later not initially when he wrote it but it can still impact the red region. An hour and eleven minutes in you have placed all but two nines one in the bottom row and one in like row three in purple or something didn't actually look hard enough up there. So I believe yellow and blue are likely the same region. This would be a good time for a region count.

@gta2812 2 года назад

The moment you got the 4 in row 6, red is already green.

@01evansa 2 года назад

44:26 That 4 was available to you for about 6-7 hours 😜

@AdamBast 2 года назад

"And the answer to this is... I don't know!"

@boman987 2 года назад

61:52 That was one of my favorites.

@andrewgrant6516 2 года назад

Round of applause.

@KombatGod 2 года назад

I'm not sure if Simon was just joking at 1:24:06 but if not it's odd how he never noticed certain features of the software despite doing a puzzle every day. Specifically, the software stops the timer automatically when its tab is inactive so the timer is always effectively the time the puzzle has been visible on your screen.

@teresagg9809 2 года назад

My time 296:59. I'm very proud of myself this is the first that I solved that took Simon over an hour \o/

@FeralWorker 2 года назад

41:45 This was really funny for some reason.

@viviencollomb-clerc5526 2 года назад

Awesome

@TheThomasites 2 года назад

Red was green at 1:02:57. The 4.

@Escviitash 2 года назад

53:31 Red and Green have to be the same. If Green was Blue then the three white cells touching blue have to be in the region too, but that will will force red to take R9C7 and R9C8 which will create a 5-cell segment. R8C9 and R9C9 must also connect to red. The options for these two cells are 1-2-3-9, i.e at least one of the cell must be a 1, 2 or 3, but neither is possible as they are all on the 5-cell segment already.

@wazzzuuupkiwi 2 года назад

I must admit, i had the wrong attitude for this puzzle, i decided to try it while glancing at the F1 qualifiers, but gave the puzzle too little attention, but at the same time too much attentiona nd got frustrated by how little progress I made. I only managed to get that the corner was a two cell region before fully tuning intot he F1 and then your solve. your solve was an enliughtning to watch, at least the break-in of thinking of divisors of 45, I had stopped to think to little of how powerful itwas when I was that several regions must include only line cells. the trip away though may have gotten you flustered too , at then end you started 75 percent of a deduction only to swap to a different spot, twice. when you fillied int eh bottom 3 cells of column 8 as '4578' you could then conclude that if tehy are all on the line, you could never make it sum to only 15, so they couldn't all be in the red region, which would mean red had to be green in order to reach enough cells. And a minute later you deduce the only two 9s left int he grid are in an xwing, but this tells you that green from the bottom corner, if it was not pink, would have to take both cells opf that domino to reach 9 cells,a nd green already contains a 9 so it must join w/ pink to avoid another 9. Again, these are things that are easy to say a s a spectator and I repeat I gave up this puzzle super early while you solved it. in any case, you inspire me to tory every one of the puzzles on the channel, even if I don''t solve nearly all of em, so thank you for that! -Tuonra

@disneian 2 года назад

In 55:37, if green joins blue with the three non-line cells, red cannot grow 4 more cells, as the empty cells in r8c9 and r9c9 cannot be 69 or 78 pair. But red has to take those two cells or they will be isolated. Therefore, green is not blue and it is red. In 1:06:59, if green is not purple, green takes at least r9c3-6, making it 8 cells. It can then only takes one more cell on the line, making the second line at r9c6 a two line cells, which cannot be a 78 or 69 pair as both 7 and 9 is in green. Therefore, purple needs to be green.

@michaels4340 2 года назад

56:37 But if red did take those cells, you would have a five-cell red region which would have to be 12345, and then the off-line cells would have to be 78 even though you already have both those digits in the column already. So red must be green.

@DitDede 2 года назад

Almost 3 hours. I shudder at how I spend my time...

@markp7262 2 года назад

1:08:00 finish. I'm so disappointed in Simon. He gave up on Sudoku too quickly at the end in favor of focusing on the river. He missed a beautiful ending in which red and green both needed a 2-8 pair to finish, and was only resolved by the river. He's just too darn smart! 😁

@dannstarrjp 2 года назад

1:02:15 the moment you put 34 in r5c7 and figured the green quadruple is 1347 you basically proved that 4 in r6c6 is not a part of this region (therefore green is red). Had you noticed that right away, you would’ve solved this puzzle at least 20min faster:) This thing was bugging me and almost made me scream at the screen but at the same time you figured out many things I definitely couldn’t find myself.

@emilywilliams3237 2 года назад

So much admiration for Simon managing to get this started, go to lunch, come back after a hiatus, and pick up the logic without missing much at all. (Helped, no doubt, by his not coming back in a delicate condition). These “chaos construction” or “build your own region” puzzles are totally outside my experience other than watching them get solved on this channel. I think that familiarity is making me a bit more comfortable with them; I even solved a GAPP on the discord the other day that was a very much simplified region-creation puzzle (I don’t remember the name of it) in pretty good time thanks to what I have learned from these solves. Thanks, Simon, for this excellent, interesting video. Some of my favorite moments: “No, no, no, oh oh oh yes yes yes no no … no … oh I see” I just laugh out loud at this kind of thing. (I may have paraphrased, but regular watchers of Simon’s videos will recognize the theme from any number of these videos, I suspect!). Today’s wonderful vocabulary word is “putative.” Just love this, truly.

@Raven-Creations 2 года назад

45:48 - Classic Simon moment! You use the preponderance of 1s across three rows to prove that a domino can't be 17, when there's a 7 immediately next to the domino in the same row. All this notwithstanding the fact that the domino adds up to 7, so it could never be a 17 anyway. Towards the end, where you're trying not to force it, you should have put a border between R8C8 and R9C8, because red couldn't extend into R9C8 without exceeding 15. This means you have nowhere for red to extend into, so it must be green. Do some sudoku to tidy up, and you then have a 13 pair at the bottom of C9, which must escape around the bottom, hitting a 4 on the line, so it must extend at least 3 cells on the line. Sudoku is then your friend. How many gs are in wooferzfg? I don't know how it's meant to be pronounced, but it can't possibly end in "gig". I'd go for "wuffers eff gee" or "wuffers fig". Nobody pronounces woofers woo-fers, unless you want to be mocked by Rowan Atkinson in a gramophone shop.

@kevinmartin7760 2 года назад

Sven's software seems to notice some form of AFK. I usually swap between the game in full-screen and the video in full-screen, and I've noticed lately that the game timer does not run when I'm watching the video.

@HeroDarkStorn 2 года назад

1:02:52 You mean, you managed to find a more exciting way ;-)

@conexant51 2 года назад

It's been a lot longer than 86 minutes. Compu'er says no.

@AndTheyCalledMeMad 2 года назад

"Red Could Be Green" I Miss the RedGreen Show. :(

@christophercoleman8823 2 года назад

Hah Simon: very good at logic; very bad at sudoku 🤣 and I mean that very nicely as I Love this channel. From 1:07-1:14 couldn't see that r9c3-5 couldn't add to 8 bc you couldn't have a 1 in it thanks to the 1 Right above where he assumed the 5 could go in r9c2 🙃

@4evafcn 2 года назад

38:00 how to easily prove the orange go to the left square. if orange has one cell of the line, every cell has to be off and closing in the yellow

@ymiros0953 2 года назад

I'd really love to see a chaos construction where regions can traverse edges so like if you looped the puzzle in both direction if that makes sense Actually wonder if something like this is already out there

@riripebby 2 года назад

Oh look, it me

@logiciananimal 2 года назад

Wow.

@chrisschmidt6636 2 года назад

The software almost guessed spot on to the video length lol

@gordonbos5447 2 года назад

oof... This wasn't nearly as difficult as I thought it would be. Finding N actually turned out to be so easy that I re-checked five times because I didn't believe it. The key is that you cannot get from r1c1 to a non-line cell without needing to repeat a 9 and therefore N must be divisible by 1, 3, 5 or 9 from 45. Obviously you can't have 9 line segments in a single region as that would require them to all have the same value while they should hold every digit from 1-9. I won't spoil the rest. Finished in an hour and five minutes.