The Hardest Sudoku... And How To Solve It

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You can try the puzzle you voted for, Hidden Clone by Sam Cappleman-Lynes from the UK Sudoku Grand Prix, here:
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The test is available here:
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▶SOFTWARE◀
Play the puzzle in the video by clicking the link under the video (above). We are building a website which will allow you to enter your own sudoku puzzles into the software and this is coming soon!
▶ABOUT US◀
Hi! We're Simon Anthony and Mark Goodliffe, two of the UK's most enthusiastic puzzle solvers. We have both represented the UK at the World Sudoku Championships and the World Puzzle Championships. We're also "cryptic crossword" aficionados. Mark is the twelve-time winner of The Times championship and Simon is the former record holder for most consecutive correct solutions to The Listener crossword. We hope we can help your puzzle solving while also introducing you to some of the world's best puzzles.
Thank you for watching!
Simon and Mark

Опубликовано:

12 фев 2020

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Комментарии : 592

@wonderbop2656 4 года назад

I want him to do one of these puzzles with the eye trackers on the screen

@simonbrignoli8726 4 года назад

Man that's a good idea!

@jxs9229 3 года назад

Was thinking the same aye

@GunganWorks 3 года назад

I second that!

@joelanttila7927 3 года назад

BRUH. that would be sick

@sarzan71 2 года назад

Yes please

@pozxyyy 4 года назад

I really wonder how I can just sit here and watch this guy solve a sudoku for half an hour, and be intrigued the whole time. Great stuff

@Sam_on_YouTube 4 года назад

Best RU-vidrs make boring stuff interesting. I'm not into death, but I like Ask a Mortician. Same with language and NativLang, art and Echo, and music and Todd in the Shadows. I like the creators. They make their subjects fun to watch, even if the topic is inherently boring, or just not my general interest. I do like puzzles though. But I don't think I would like watching someone else do them if I didn't like the way they present.

@Poyni 4 года назад

today i spent 6 hours on one puzzle

@Sam_on_YouTube 4 года назад

Actually, I only watch Simon, not the other guy.

@azharshaikh8944 4 года назад

pozxyyy woooord

@theeldergamer700 4 года назад

I do this while only understanding a 50% of the things he says because I'm from Spain and my english is clearly not the best XD

@mitch-lawless 4 года назад

“I am lost in admiration”, what a beautiful and endearing sentence.

@crhulsey56 4 года назад

this is far beyond me i like Sudoku but i have never searched google or youtube and some how this is on my Recommended page. lol great job

@shnooel3952 4 года назад

I opened the soduku app on my phone for the first time in a year yesterday and this was in my recommended 2 hours later lol

@hm09235nd 4 года назад

its just generally trending and you guys happen to have a connection

@obsoleteprofessor2034 4 года назад

The vaccine chip has a YT link

@jestfullgremblim8002 Год назад

@@obsoleteprofessor2034 lmao

@OddSauce 4 года назад

I think it's safe to say this quarantine is getting to me

@insertcringehere5833 4 года назад

same

@korvo9936 4 года назад

big same

@famoussession7426 4 года назад

OddSauce Not me

@lilaclyliac 4 года назад

Samee

@curtisgroce973 4 года назад

OddSauce same

@riyo.38 4 года назад

The structure of this Sudoku is so insanely perfect. You're sat there, wondering during the whole solving of the Sudoku, if your approach was correct or not. It's like watching a movie, where the main character follows calculated assumptions and you as the viewer, are always second guessing him. He gets hints all the way, which seem to lead him nowhere, right until the end, when his first guess, with the final piece of evidence, comes true and the whole case resolves, like a perfectly put together Swiss watch, with all the gears fitting perfectly. It's just brilliant. Mind blowing, how this is solvable and even more mind blowing, if you think about the fact, that someone has put this together.

@Garymaster4321 4 года назад

very well said

@NiNash1 4 года назад

Damn well said!

@r4myyy999 4 года назад

Oreohunter 38 damn u talk too much

@riyo.38 4 года назад

@@r4myyy999 yeah, has gotten out of hand kinda. But I'm a copywriter as well, so writing is my job basically 😂

@leporid257 4 года назад

I've been wondering! He has no clue if he had to go up or down with the clone, did he?

@Animefan1803 4 года назад

it´s 1.16 am. On a tuesday I´ve never tried a sudoku in my entire life. Yet here i am. Quarantined and drunk. Watching this guy solve sudokus on 1.75x .

@Animefan1803 4 года назад

@@account5223 that´s to fast. Wanted to understand what he was saying

@Delephene 4 года назад

It’s 4:10 on a Thursday morning watching on 1.5x. I’ll have to upgrade my game to 1.75x now

@issaile 4 года назад

ah i see youre a man of culture as well

@H1nted 4 года назад

I dunno but as a soduko lover i watch this at normal speed to see if i can see things faster than him

@Animefan1803 4 года назад

@@H1nted Point is: I never even googled sudoko. Yet somehow i´m here. The Algorythm works in mysterious ways.

@KurtHugoSchneider 4 года назад

incredible puzzle, managed it in 23:13 and I felt like I moved pretty quick.. absolutely crazy that the top people are solving this in 10 minutes.. too good

@harrisons62 4 года назад

Kurt Hugo Schneider still pretty good I doubt I could ever solve this.

@finlayhutchinson7370 4 года назад

humble brag lol

@realitant 4 года назад

Still waiting for the next nerd alert video :)

@loominatyproductions9444 4 года назад

Master chess player, Sudoku wiz & incredible musician, you got it all Kurt!

@kolosmenus 4 года назад

I think the only possible answer is that they were familiar with the "clone" idea and were instantly able to pin point the possible locations. Because I really can't imagine them analyzing this and then filling up the grid.

@agentg5233 4 года назад

Go to 13:17 man that was the most British thing I’ve ever heard

@Jota1 4 года назад

AgentG5 lmfao

@michaelorange4879 4 года назад

HOH HOH HOH

@lancelotray 4 года назад

French laugh: Hon hon hon British laugh: HOH HOH HOH

@needfoolthings 4 года назад

Eh-chawchawchaw.

@JaharNarishma 4 года назад

I think 23:25 is quite good as well. At least it's an expression I haven't heard before.

@Fristytoes 4 года назад

Just discovered this channel, and I must say I am hooked. This was my first attempt at a non-standard sudoku. Did it in 4:02:42, which is kind of an embarrassment, but I was still proud of completing it anyway lol. I thought if I did the "hardest" one, then the rest would be relatively easier. (But I doubt that!)

@1mSeal 4 года назад

nothing embarrassing about it, if anything you showed perseverance and resolve, this is admirable that you didn't give up and watched the video to get the solution that you knew you have had available. also, this is a first attempt for you at a non-standard as you pointed out, and this is a very hard one, so it makes sense that it would take you longer than to someone who is doing advanced sudokus like these regularly.

@derkaffeenator9172 4 года назад

Reater Jr. yeah that’s pretty much what’s going on here

@jasmith4183 4 года назад

Took me 4:08:00

@oxey_ 4 года назад

thats good dude, I probably like most others gave up after messing around with for a bit without really seeing progress. Great job

@anidleteen 4 года назад

I was debating whether to try it, but I think I'll watch it and try another one instead 😹

@jumpingjflash 3 года назад

I'm fascinated by all the features you have in your software: 1) the ability to mark and write in multiple squares at once 2) you have 2 types of pencil marks, centre and corners 3) the ability to shade squares with different colours What app are you using, and is it available to download?

@ianh1504 2 года назад

This is a year late, but you ought to check the video description :)

@boots4snootin571 2 года назад

"Click on the link below the video see the software"

@brodhax6148 4 года назад

I have no idea what hes talking about. Im just sitting here listing to smartness in action

@nielsliljedahlchristensen4924 4 года назад

You're not very bright then. Sorry :(

@brodhax6148 4 года назад

@@nielsliljedahlchristensen4924 Nope, but im tall and good lookin, ill get by

@johnjackson393 4 года назад

Niels Liljedahl Christensen that’s kind of a dick thing to say

@mvdb843 4 года назад

@@brodhax6148 hahahaha love that

@nielsliljedahlchristensen4924 4 года назад

@@brodhax6148 And pretending to be stupid for likes. Why is stupidity attractive?

@ainsleemcnamara7514 4 года назад

"I wanted to explain that slowly... for myself" what a mood

@hilcovanbreeschoten720 4 года назад

1:13:12 That took a very long time. Even getting an idea how to even start took me like 10-15 minutes. It involved a lot of new logic for me, and I'm very happy I solved it without resorting to the video.

@nielsdewolf9991 4 года назад

Same, did it in 1:22:52

@FetnerVideos 4 года назад

01:19:57 for me. Damn its satisfying to complete once you do.

@hakai1488 4 года назад

Same, did it in 1:11:38

@ginrodino8542 4 года назад

I'll be honest, I looked at it really confused for 30 minutes and gave up. I had a headache trying to figure out what could go in and mirror xD

@ginrodino8542 4 года назад

Not mirror, copy

@Kelarys 4 года назад

It never crossed my mind before that there was competitive sudoku, and now that I know there is, I just thank god I have music or else I would feel like I missed my calling haha

@jestfullgremblim8002 Год назад

Lmao

@ardemus 4 года назад

I enjoy the logic for translating the shaded region: You can't translate more than 2 squares in any direction without leaving the grid. You must translate in both X and Y to avoid row and column duplication. The rest comes down to moving every shaded cell into a new region. Four of the shaded squares are in the corner of an outside/middle region. They can't move 3 spaces to cross the far boundaries, so they must all cross at least one near boundary. That forces either up/left or down/right. Finally, you must move 2 squares in both X and Y so the four central shaded squares escape the central region.

@henrihell 4 года назад

You can think about it even simpler than that. 1) Must move in two directions. 2) Can't move more than 2 in any direction. 3) Any knights move or moving 1+1 breaks the middle box, so you have to move 2 steps in 2 directions. 4) Row 3 Cell 4 can't move 2 up and two right and symmetrically r7c6 can't move 2 left and 2 down, so the shape will have to project onto itself.

@Penguat 4 года назад

@@henrihell I don't see why R3C4 can't move 2 up and 2 right - the rules don't specify that the clone has no numbers filled as yet?

@henrihell 4 года назад

@@Penguat R3C4 2 up and 2 right keeps it in the same 3x3 box. The fact that there's a digit in that square has nothing to do with it. :)

@Penguat 4 года назад

@@henrihell of course, thanks!

@smeutr1 4 года назад

The algorithm suckered me in with one video, and now I’m hooked

@chaosenergy1990 4 года назад

The algorithm is skynet.

@pdnh8275 4 года назад

"So _ goes in this square here because it can't go in that square" Me: spends 10 seconds trying to find out why it can't go in that square and gives up and decides it's better not to question anything

@stephanberger3476 4 года назад

I was like that, too. With the bottom-right 5.

@evandroa4845 4 года назад

@@stephanberger3476 Bottom right 5 had to go there because if it was put in one of the two squares bellow that one it would force the bottom left 5 to be next to the 2, which would conflict with the top left 5. Another way to look at it is to notice that was the only square in row 7 where you could put a 5.

@dijoxx 4 года назад

Maybe you need to find something else you can enjoy with your level of intelligence?

@Xonarag 4 года назад

@@dijoxx Way to be an elitist lol.

@ep1873 4 года назад

15:18 during the competition, in which I got 44th place. This puzzle really helped me who is extremely inept at classic sudoku.

@ZuchinniOne 4 года назад

Thank you so much!! Loved it! Also I took a different approach to the initial assessment of what positions the clone could be in by looking at the four middle squares and noting that they could not ever translate in such a way that any one of the 4 squares initially in the middle box remained in the middle box after the shift. Seemed a bit easier to visualize that way :)

@Lorefall 4 года назад

When your trying solving a puzzle and you cant even understand the rules, your in trouble.

@doemaeries 4 года назад

*you're

@KB-ee8xf 4 года назад

When you are typing in English and can't understand the syntax, you are in trouble.

@KB-ee8xf 4 года назад

@@account5223 yes, he spelled You're incorrectly. But, I argue that he used the wrong word to make the sentence, so therefore he use improper syntax.

@KB-ee8xf 4 года назад

@@account5223 as stated previously, he should have used "you're" instead of "your" Yes, you can argue this is a simple spelling error but since this spelling error changes that word completely and therefore makes the sentence unintelligible, it is also a syntax error.

@KB-ee8xf 4 года назад

@@account5223 this spelling error resulted in a entirely different word, that word made the sentence have (or contain) a syntax error. Google the definition of syntax and then think abstractly about what I am saying. You aren't wrong that the spelling needs to be changed, I am just saying that there is more than spelling involved in this error. There is also grammar and the syntax of the English language.

@Ruminations09 4 года назад

I don't know how I stumbled upon this video - it's been many years since I last did a Sudoku - but I figured I'd give it a try. Took me 1 hour 16 minutes 17 seconds. About double the times some of these other comments put down, but considering how long it's been since I've done a Sudoku puzzle, I'm still pretty proud. This was certainly a challenging one.

@lalzeriiiiii 4 года назад

you know you're on the final stage of finishing youtube when you watch a game of sudoku for half an hour

@baccarah7010 4 года назад

Im sure this guy can guess a girls phone number by just beeing given 2 digits.

@JaggerG 3 года назад

Of course not! He doesn’t guess, he uses sheer logic to discover the rest of it! Also, give him a thermometer and he doesn’t need any givens. :^P

@unperrier5998 3 года назад

He'd start by saying to her: - you're definitely not a 8 or a 9, maybe a 7... And he'd get a big SLAP in his face... now finding the rest of the digit is pointless. Poor him.

@patricepederson9211 3 года назад

I feel like this comment was vastly underappreciated by the other commenters. So I just had to comment to say that this was hilarious.

@Herculean.Aficionado 3 года назад

@@unperrier5998 that one was good 😂😂 made me actual LOL

@Autoskip 4 года назад

39:23, and I notated both directions at the start, so I knew the whole way through that had the right hidden clone. Plus, I found it rather helpful to label a few extra cells with the cloned cell colours - it meant that I could, without knowing which numbers they were, “solve” a few cells earlier than I would have been able to otherwise.

@TraytonOtto 4 года назад

45:18, though I listened through 6:08 of the video for a hint for how to think about the hidden clone. Really a beautiful puzzle that I can't imagine doing under time constraints.

@richardhenrysutterrosendo3439 4 года назад

58:51 Had to check which of the translations along the main diagonal was the right one, with backtracking. Really nice use of the color tool for this puzzle.

@RandomBurfness 4 года назад

39:00 flat for me! It took me a while to get into the logic but when I did, it sure was beautiful.

@vlarsen10 4 года назад

Solution to your bifurcation problem in real-time: You showed that the green cells can't be 7 (this is actually true NO MATTER which way the pattern shifts; very important). That makes an 89 pair in central box. Thus, red is 5 and purple is 2. The 2 prevents the pattern from shifting downwards, because of column 7.

@BrunoFiss 2 года назад

Came here to say the same. It's a bit more elegant than guessing :)

@matthiasney4871 Год назад

What a beautiful solution. In fact, even when you do not decide whether to shift up left or dowm right, still you can exclude almost all numbers from the crucial cells, leaving vou with two pairs of 8/9. Excluding the 8 and 9 from the other grey cells, you are left with a safe 2 and a safe 5. All this, as you said, without having to decide which direction to shift. What a piece of genius this Sudoku is!

@gogigogi_flover 4 года назад

39:27, it took me 1 minute to find the only two possible locations for the clone and 20 minutes to find out logically why the clone cannot be at the bottom right, then spent rest of time cleaning the remaining grids. This is a great one!

@vesanius1 4 года назад

I don't have the patience to do sudokus myself, but watching this videos is just so relaxing for some reason. It's very easy to follow up and even as an amateur I still understand the reasoning behind everything because it's all well explained. Wathing this for sure will improve you as a sudoku maker as well. Not in a million years I would've thought that I'd end up watching a guy solving sudokus and never skipping a second and hours at a time. Genius.

@jessvarey2597 4 года назад

This is brilliant! I love watching you solve these. I don’t even do the puzzles but maybe I should start with some easy ones. Thanks for the entertainment.

@eliaskar5084 4 года назад

I've been watching this channel over the past week. This is the first puzzle I managed to totally solve on my own before watching the video! I'm so excited :D

@ChilliDuck 4 года назад

im always stunned at how fast youre solving until i realise that i watch at 1.5 speed, so i can go to sleep punctual. but youre still so incredibly fast! everytime you get amazed from a puzzle and say you slip into the mind of a greater person than i can only give that statement back at you for being able to solve those at that speed

@ninnygrantier9931 4 года назад

"this is so clever, this is so clever. ha ha" the small laugh got me

@DWestheim 4 года назад

41:04, including 18 minutes of dutifully coloring every cell that could be a "corner" of the clone of the given shape without realizing that they were actually almost all impossible and that there were really only two possible locations for the clone. Sometimes I'm just dense.

@dsch772 4 года назад

Took me 41:02. Pretty close :)

@J7Handle 4 года назад

Took me an hour and I proved the clone in the top left in the first five minutes. I’m just bad.

@mikspurins1455 4 года назад

38:00, honestly just glad I could solve it at all :)

@Asdayasman 4 года назад

Yeah but you had fun drawing a pretty picture so it's ok.

@t1nytim 4 года назад

22:44 certainly challenging, was a lot of fun though. Though I did take the time to confirm that in transformed in that upward direction, rather than the downward direction.

@mickaelzehren8249 4 года назад

How can you confirm that? I didn't understand the argument of the video.

@dopaminecloud 2 года назад

@@mickaelzehren8249 two pairs contained a 9, no matter how they resolve, you'd end up with two 9s in the box

@erickthomas6133 4 года назад

This puzzle looks impossible at first, props for getting through that and huge props to the puzzle maker.

@Tierdas 4 года назад

stuck on your channel now after finding you through recommended videos. am not a sudoku solver but I really enjoy your vids! I solve along in my head and it's nice to keep the braincells working without having to do much. hard to explain but to put it short I really enjoy your content despite not being your target audience!

@theknewwon9453 4 года назад

This was the first non-traditional Sudoku that I was able to complete from this page without any help from the video! It took me 1:31:48 (which is insanely slow in comparison), but it's an achievement for me nonetheless. The logic behind figuring out how to clone the region was so amazing to figure out. Thanks for sharing these puzzles. I never would've thought about Sudoku with outside constraints if I hadn't found this channel!

@bnagybalint 4 года назад

57:29 for me. I don't understand how you ended up being certain that the shift is two squares up-and-left. At around 12:00, you start by trying this shift and it works out fine, but it wouldn't have to. The down-and-right shift was equally likely at this point. Were you trying this approach in a hope that if you chose the wrong way, you would get a contradiction quickly? Or was it luck? Or am I missing something? Thanks!

@patricepederson9211 3 года назад

Same here! Reading the comments to figure out how he knew it was that one of the two. I got as far as that myself (pats self on back), but couldn't figure out how to differentiate.

@timavery850 2 года назад

he got lucky, but going down would have resulted in an 8-9 pair and a 5-9 pair as the 4 options which would rule it out

@bringforthyeshadow 4 года назад

I've started doing Akari puzzles because of your last video, they are really quite interesting!

@AxillaryPower2 4 года назад

how in the world does one even make these kinds of puzzles?

@lukemit6640 4 года назад

I think I'd retire if I made that haha

@Atchfam77 4 года назад

Woo! After understanding the thought process behind the translation, I was able to solve along with the video in just around 33 minutes. I would get stuck or go pretty far ahead and cross-reference the video to see you do the same steps as I did and it reassured me to keep going forward. I missed a few simple resolutions that I had pointed out to me in the video, but like always once you get momentum, the whole thing seems to solve itself. Very cool puzzle.

@gregoryshipley4637 3 года назад

Thank you so much for sharing these puzzles. I've been watching and it has reignited my latent puzzle love. Very proud of myself as this is the first of this kind of "hard" puzzle I've solved without assistance. Took me over 30 min to get a digit in but it was a very satisfying solve.

@kimlightfoot 4 года назад

That was terrific. Foundyour channel by accident, but as an expert solver myself. I followed your logic, this is the first time seeing variations, I am not normally a fan of sudoku variations, but this was awesome to follow, and see if I could beat you playing along. I had your 89 combo solved before you did, but only because I solved the top right and bottom left numbers earlier than you did. I could never have figured out the cloning as you did, having never before seen chess type rules, or clone rules before. But I loved it. Now to my expert books. cuzz I am in sudoku mode now. lol. You earned a subscriber today!!

@TheBlackZodiacGhost 4 года назад

I see a 30 minute video (well close enough) I instantly press like! :D

@TheSarahskaninchen 4 года назад

I was so proud of myself for figuring out it had to move two squares diagonally, but then I was stuck for a while and I was so amazed that he immediately ruled out the seven - and so fast too!

@lakarto19 4 года назад

Nice puzzle. My solve time was 59:36, about 40 of which I spent trying to figure out the initial logic with where the 'clone' could be placed. Got there in the end, but took a bit too long. As for the video solve, I would have personally preferred it if the contradiction (with what happens when the grey area shifts diagonally downwards) had been shown before the correct solve, since most of the video felt a bit like bifurcation otherwise. Once again, huge respect to people who compile and solve these puzzles in competition settings, and looking forward to more puzzles from the grand prix.

@MrSaydo17 4 года назад

1:04:17 - Super happy i was able to get this without guessing if it went up or down the diagonal. It was the 7s in box 3 that did it. If C4R3 and C5R5 are 7, and it shifts up the diagonal, then 7 must be in C2R1 forcing 7 in C9R2, but the 7 in C9R4 rules that out. If it shifts down the diagonal, C8R7 must be a 7, foring C7R3 to be a 7, but C4R3 must also be a 7 therefor C4R3 and C5R5 can never be a 7. Then the 2 in C7 rules out the shift down the diagonal

@nopenopessson317 4 года назад

This was in my recommend. I've never tried a soduko before but I saw this entire video and enjoyed it. RU-vid knows me more than I know myself. Gonna learn soduko now

@nicksm7980 4 года назад

Start with the correct name of the puzzle.

@MathildaLindgren 4 года назад

Really good puzzel one of my favorties! thanks for providing

@willdailey9775 4 года назад

This man is a national treasure. Love your videos man!

@BallerineMimi 4 года назад

A great challenge, the colour shadingfunction on their website is sooo handy! Took about an hour and a half, very proud!

@nady2296 4 года назад

49:29 took me some time to be sure where to place the "new" shadow region. And then it was quite long but not SO difficult

@alandouglas2789 4 года назад

Nady 22 nah, got proof?

@alienrenders 4 года назад

For some reason, I thought this one was rather easy. I just colored the board red where the bottom gray cell couldn't move to and it left only two cells along the diagonal. Then I colored the gray cells as you did and noticing the 7 couldn't be used meant the rest solved as a regular sudoku. I did use a specific color for 8 and 9. I didn't know which was which, but I did know which ones were the same. So instead of numbers, I could color it in. I started the shift of gray cells toward the bottom and saw there weren't enough digits. And the fact that all four colored cells were in the same box meant they had to be different digits. This is what led me to believe I was on the right track as to the clues you're supposed to figure out. Really cool puzzle. Thank you for showing it.

@deanhickerson1000 4 года назад

This was easier than I expected; I took about an hour to solve it. I found the solution at 55:06, but I'd trifurcated so for completeness I went back to explore the remaining option, which took another 5 minutes or so.

@ShadowMark474 4 года назад

41:40 for me, time might not be accurate though, because I had the tab opened in the background while I watched the video a bit to see the rules. I honestly didn't think I'd be able to solve the puzzle so I didn't worry too much about my time lol. Really fun and interesting puzzle though, glad it was chosen, but I'm also curious about the tic-tac-toe one. Also kinda disappointed that you didn't rule out the down-right transition before continuing, but it was pretty easy to do, so I can forgive you lol.

@bristolrovers27 4 года назад

Nice biofication !!! A really excellent puzzle and a dazzling solve despite the use of Boman’s bingo !!!!

@bogdangiusca5057 4 года назад

It took me over 1 hour with restarting the clock and a few hints from him so how someone cand do this in under 10 min is beyond me

@nickieshadowfaxbrooklyn5192 4 года назад

I've noticed a few steps in the process you missed, I guestimate they could have sped up by 5-7 mins, but noway it's doable in 10 min limit for me. Great puzzle, btw. So elegant and mathematically beautiful. I enjoyed it along.

@randomcubing7106 2 года назад

I love how this was the Hardest Sudoku back in the days

@S3c13nt 3 года назад

took me 57 minutes. with a little bit of your help. but since i am new to sudoku with changed rules or added rules, i think that is quite impressive. im proud of myself. and i wanted to say i love your vids.

@Odesawaan 4 года назад

After watching the first five minutes I paused the video and did the puzzle myself. I'm a novice at doing sudokus though I have an interest, and this one looked really intriguing. It took me over an hour but it was fascinating to watch how this logically unfold in a counterclockwise spiral across the fields. It was like an interwoven web weaving its own shrinking possibilities. I spent about ten minutes just repeating it some parts to myself simply because I started to secondguess myself once I started picking up speed by following the threads. I'm in awe from it.

@itsmegeorgeous 4 года назад

Don't know how or why this came up in my suggestions but I quite enjoyed it. I am a total novice at puzzle solving and soduko but thought i'd give it a go as it had come up on my feed. It took me 01:02:58 which is clearly not good but I'm not displeased as I hadn;t even seen a soduko in years. It has inspired me to have a go at some more and look at some other types of puzzles.

@Sam_on_YouTube 4 года назад

I was with you until 25:55. When I did it myself, I put a 3 in the wrong spot and screwed the rest up after that. Happy to get that far before making the mistake though. Took me a LOT longer than it took you. I went backn until I found the incorrect inference that lead to the mistake and redid it from that point. Solved the rest quickly from there before watching the rest of your video.

@dracaaarys 4 года назад

Sometimes the most enjoyable videos are the ones you hopelessly know (as an amateur solver) you'd never be able to solve on your own. Cheers Simon

@glennmelven3414 4 года назад

Waaaay beyond me. Loved watching Simon though.

@amargasaurus5337 4 года назад

This is mesmerising *_and_* amazing Second sudoku video I just get hypnotized into by this man, and I bet there's many more to come xD

@super_7710 4 года назад

Woop! It's been a few years since I've tried a Sudoku. I thought I'd try this one to see how hard it actually is. Managed to solve it in 1:14:16! The trick is to understand that the clone can only be in one of two places and that it must overlap. Then it's just normal sudoku - testing rows, columns and boxes until you find situations where a number has to go somewhere.

@rowandeblok5472 3 года назад

this is my very first time where I've finished a solve before Simon, though without his help I wouldn't have gotten there at all

@chrisi1466 3 года назад

This is the first one out of watching and trying myself before watching I actually got without using the video for clues. I’m so proud of myself despite my previous 50 failures lol

@BlueCyann 4 года назад

Nice! Not nearly as hard as I was expecting it to be based on the video time, only 1:00:26 while eating dinner and stuff at the same time. I guess the logic is (relatively) compatible with the way my head works. Still felt like figuring out how to think about the clone options and removing the 7 took an embarrassingly long time, the rest is just me being me. Easier than the last two!

@Embre07 2 года назад

I didn't know there was a sudoku side of youtube and that it was so mesmerizing. I bought some sudoku just for that and god mine are simple compared to his but I'm so slooow ! I admire him for that mental capacity of seing all of this tricks so quickly ! Amazing.

@jabby7235 4 года назад

Working out one number before this great man is unbelievably satisfying.

@karl-erlendmikalsen5159 4 года назад

What I think is truly fascinating is how differently we solved it. Well, of course I started with the clone-area, but I started with the bottom right rather than the top left, and I colour marked everything that couldn't be the bottom right in the cloned area. Then, I'm not really sure what we did differently, but I swear that before I was half way through I had solved all the 1, 2 and 3's.

@abderianagelast7868 4 года назад

It took me until the very end to notice the date, but this was my birthday puzzle for the year! And an impressive one at that! Too bad I couldn't solve it on my own, but by next year hopefully I'll be able to!

@GhostZeroGZ 4 года назад

It might have taken a while to explain that, but I came to the same conclusion just by looking at it and I didn't know why I felt it was true. You slowed me down and showed me the math to why I was right

@LostMagyk 4 года назад

Took around 30 minutes, after thinking I wouldn't be able to solve it. Figured out that the clone could only be in 2 places and worked out the digits for each number leading to an 89 pair. Then saw that 5 was the only digit left for a number in the main region, giving 2 as the other number and pushing the clone to only be possible at the top. Logic after that was fun to follow. Really enjoyable.

@JT-tm5vj 4 года назад

I gave it a go! Did it.... took me 2hrs - I don't partake in much sudoku - I felt like a genius!

@tbmike23 4 года назад

I just spent 10 minutes shouting at the tv: the shape can overlap and repeat! They give you answer, the constraint is always the clue.

@toantu3005 4 года назад

He was trying to find the solution with 100% certainty

@michaelclarkj 4 года назад

Got it. Used your web app and close to three hours, but I got there. Super fun. :)

@spinningdog2578 4 года назад

Didn’t know sudoku can be this fun! Tried it and did it in about one and a half hours. The guy who solved this under 10 minutes must be a genius!

@yichen6313 3 года назад

I finally got it at 2 hours! It's not too hard to figure out where the shadow is, but the 7 elimination he did at 16:09 took me forever to spot

@demerion 4 года назад

I'd love to see the other puzzles sometimes!

@miraculix666 4 года назад

I recommend the tic-tac-toe!

@phillish2258 4 года назад

Du hier? O:

@Wecoc1 4 года назад

I voted for the tic-tac-toe indeed

@demerion 4 года назад

@@phillish2258 Loooool, was ein Zufall, hi!

@evlredsun 4 года назад

71 mins, fwooo, this was a toughy. i really enjoyed the logic on figuring out where the clone goes though.

@plusjeremy 4 года назад

Well I have to say, I’m pretty proud of myself for solving this one. But I guess that makes sense: I’m pretty rotten at sudoku, but I have a math background. Once I applied some logic to the theme, I was able to make progress almost immediately. (The remainder of the puzzle was standard for me, which is to say, difficult, because it’s sudoku.) Looking forward to watching the video now!

@bfish89ryuhayabusa 4 года назад

I'm surprised you just went with the upward shift. I put both as possible, which works because you can rule out anything in the outer clone boxes that intersects both versions of the same cell, which happens enough to work. Combine that with the middle clones are the same as each other, either way, and you can narrow it down and then eliminate one of the two moves.

@cl5rys 2 года назад

My teacher taught me the rules of suduko a few days ago it’s easily become my favorite puzzle, if use to be my most hated now I enjoy it and look for time to do it

@juanander 4 года назад

Quite proud of 28:40 after staring blankly the first 5 minutes. Mind boggling how the world best can do it in almost 1/3 of the time!

@ganapathikondraju6499 3 года назад

I just came to know how tough sudoku's can go, watched 9 min video, felt happy with what I have. Don't dare to come again.

@muntoonxt 2 года назад

Took me just under two hours! 1:55:47. You managed to figure out the diagonal pattern and its restrictions in 10 minutes whereas it took me the entire hour. :) (I'm not an advanced sudoku person.) One nice property of the puzzle that you may have missed was that many of the constraints were repeated for **both** possible locations of the pattern. The lower right pattern possibility could then be eliminated entirely using the "89" pair that you discovered.

@achad1607 4 года назад

Putting the 17 pair in the third row saves a lot of effort. The 1 and 7 in the sixth and seventh rows restricts the 17 pairs to row 3 column 3, and row 3 column 7.

@yaycupcake 4 года назад

Just want to mention I voted in the poll for hidden clone even before I got to the point in the video where you said you didn't want people to vote for that. So not ALL of those votes were people trying to make you suffer. haha

@erickehr4475 4 года назад

I completed that in 22:21 which I am very pleased with. I’ve not watched the video yet so haven’t checked if my logic was sound, but I believe I managed to restrict the position of the clone to one of two places; couldn’t see an obvious way to work out which was right and just guessed. Luckily I guessed right, else there’d have been a load of backtracking! E.t.a. Having watched the video, I’m amused , and quite frankly surprised, to see that Simon basically did exactly the same as me! Although he was dedicated enough to check why the other way wouldn’t work, so hats off to him for that.

@aamocryp 4 года назад

there was in the end a way to logic where the clone could go, as two of the cloned digits needed to be 8&9, and the other possible placement for the clone wouldn't have worked with that restriction! (it would've required two of the cloned digits to be 5&9 in addition to the 8&9)

@Bigcubefan 3 года назад

The entire lenght of the video I was asking myself "how does he know the shaded region can't be moved to the bottom right???" but at long last, the explanation! :D

@danielparker8449 4 года назад

23:32 for me. I figured out the correct shape, then just ran with the first numbers that seemed to work. I think I got a little bit lucky

@DmitryArciszewski1 4 года назад

Wow! Not only I enjoyed watching the puzzle being solved, but also learned new English idiom, "start cooking with gas".

@jixaw9383 4 года назад

I haven’t watched this yet and gave it a shot for an hour and it broke on me (logically). So I really want to see how close I was to the true logic because I know I had some rules 100% correct

@EddieOtool 4 года назад

Over an hour and a half... Did it on paper and got quickly lost into pencil marks. Also hadn't done a Sudoku in over one year (OK, maybe just one or two), so a bit rusty. ;) And I was tired, so I feel I got all the best excuses in the world to still think I can compare to the best in spite of my underwhelming performance. :P In all seriousness I am just glad I could crack it open... means the brain's still half-working at the very least. Still lacks quite a few gigs of RAM tho; I'm overdue for a rebuild.