THIS Will Make You Fall In Love With Sudoku

[@PsychoSoldierPrometheus]

43 minutes. First puzzle I'm solving by myself. I feel proud!

[@Grandy_UiD]

Good stuff, keep it up.

[@hai-mel6815]

Well done!

[@petermawhorter9016]

Nice! This is like my 20th and I got it in 01:42:56

[@SiculusTheEpithet]

I actually broke through this in a totally different way - if you look at column 2 and look at row 8, both of those have exactly 2 spaces where a 5 can be. since those spaces are in the same box, and there can only be one 5 in that box, they have to intersect, and the only intersection is the circle, which means all 5 circles not on a line are 5s, and it skips a lot of the necessary logic to determine what's on the line because all remaining circles are on the line

[@SiculusTheEpithet]

This one is impressive in how many different ways you can progress with the logic, I really love this one more by seeing someone else do it

[@gavindeane3670]

That's how I got started too. I'd already noticed there were exactly five circles off the green line and I had wondered whether they might end up being 5s. Then placing the 5 in box 7 confirmed my suspicion and I was off.

[@ilsekleibscheidel7219]

Never before on this channel I saw so many comments, that suggest alternative ways of solution, which is the main reason why I am reading the comments as often as I can. It is fascinating how different ways in logic can lead to the same result an that‘s why I like puzzles that permit different ways to be solved. Even so not every way is fully proven, it shows the creativity of the followers of ctc, inspired by two very fascinating minds, Simon and Mark. Thanks a lot for this.

[@MixR700]

Took me 45 minutes but proud to say this lovely fun puzzle was the first one I was able to do all by myself. Now to watch Simon do it in half of the time and see if he got the same breakthroughs I did

[@BijickY]

Congratulations 🎉

[@unrealed]

That was such a convoluted way to find the 9s, Simon... Looking at the 5s places the 5 in box 7 pretty quickly. Then, there were 10 and 9 circles of opposite polarity. Neither of the 2 sets could have 2 or more high digits or we'd go past 10 circles. So one of them HAD to be 9.

[@unrealed]

@@davidenas Not in my scenario, coz the 5s fill the non-whisper circle. So what's left are the 10 and 9 circles on the big whisper line

[@davidenas]

@@unrealed Sorry, you're right. I missed part of your comment.

[@joetucker971]

​@@unrealedThis is really lovely logic, nice find :)

[@stevesebzda570]

​@@unrealedYeah, I did the "5s" 1st All of a sudden I saw it, r8c2 is the only cell in conjunction and common with the only places for 5 in col2 and row8 That "circled 5" meant there had to be four more 5s in circles (OFF the line of course). Around 16:42 of Simon's solve helped me with the polarity and the 9s. Got the 4s and now the 3s. I'm stuck now, so I may have to tune back in to Simon's. ;) 😉 😆

[@HunterJE]

The moment Simon colored the positions on the long line I noticed that there were 9 blue cells and none of them shared row/column/box and guessed what was coming :)

[@ytb1ueaura]

@@HunterJE well aye, we all have a pattern seeking brain and i’m glad yours is working :)

[@evanbasnaw]

Yeah, I was worried at first when he started with "purple can't be low" 😂

[@davidenas]

In addition to that, I also noticed the exactly 5 circles outside of whispers really wanting to be 5s. But, of course, I still had to prove that.

[@kibels894]

For me the easiest way to tell the polarity is the 3 purples in box 6. If they were high the lowest they could be is 6+7+8=21 and there's more than 3 blue circles so it's not possible for purple to be high.

[@RichSmith77]

I did something similar, but used the three purple circles in column 2. Same method though.

[@林老師-i5d]

same here

[@davidrattner9]

Wish you Simon and Mark best of luck for Saturday's crossword championship!! Cant wait to see Knts puzzle. Congrats Titus on your debut feature that Simon solved. Very exquisite and fun with circles and German whispers!!

[@Pokeminator]

Took me 26:06. First time ever I solved a Sudoku in less time than the video length. It was extremely fun!

[@TheBioRules]

Thanks for the birthday wishes Simon! Had a lovely day off, and a wonderful meal with my family. My mom stopped making cakes when me and my brothers were younger because she found she was throwing too much of it away, and instead switched to making giant cookies (we call them "cookie pizzas", and many pizza places have now started offering the same idea). These would always be eaten all too quickly, and are a huge favorite. So I got to enjoy some of that for my birthday instead of chocolate cake, but I still find it the best. All our love from Canada!

[@jamiem4121]

I did this another way: first realising a 5 had to be in a circle in box 7, then that all circles not on the line were 5s, then working out how 19 circles on a whisper line had to be filled in.

[@OverkillSD]

Solved in exactly 13 minutes :) Very approachable logic, and what a great use of circled digit and whisper logic!

[@Kairamek]

I love that this starts with Simon trying to explaining why purple can't be low digits buy explaining exactly why they are.

[@aliengeo]

I noticed the 5s based on the German Whispers constraint :) 5 can't be green, and if you try to mark out where a 5 can be on the left side of the grid, you end up concluding that a 5 must be circled. But which circles can the other 5s go in? Why, they must be the ones that aren't green.

[@Kairamek]

My immediate thought when counting circles was there are five circles off the line. Five can't be on the line. That is not a coincidence. It might be a misdirect, but it is intentional.

[@jacob9692]

24 MIN I rarely do a Sudoku in less than 25 min this is my Favorite Circular Reasoning/German Whisper Sudoku So Far Beautiful Setting at its FINEST!

[@nimbusottosen6465]

I'm so glad I started this and got past the break in so I could get ready to watch Simon discover the high digit.

[@nicka3697]

Easier break in if you look at row 8 and column 2 and ask where the 5s are. They have to be at the intersection which gives you 5 5s in the non line circles. Then with remaining high and low groups of 9 and 10 cells it is trivial to deduce the 9 cells must all be 9.

[@OlafDoschke]

True, more precisely box7 tells it, in r8c2, where row8 and column 2 cross is the only place for a 5 and that's circled. Then you only have 5 circles off the whisper line, so they all are 5s. I still also liked Simon concentrating on which of the whisper circles are low and high, leading to 4 being on the line definitely and then also forcing 9 into circles, which meant only blue (in his colouring) could have 9s in them. Could be deduced by row 9, as he saw and told, but also box 4 or box 9, which only have one circle. And then you get the 5s for free as 12349 sums to 19 and 5 is the next lowest digit and only one, that fits to get to the 24 circles total. I also wasn't initially spotting the forced 5. But in easier level puzzles many solve paths exists. It's very elegant and observant, if you spot 5s that way. Starting with them, you still need to get through all the logic about low and high whisper cells and only then get to the full group of 123459. I was only missing concentration of Simon on the other whisper lines T pieces, where only 1289 can go, or 128, once all 9s are known. I got the whisper in (mainly) box 4 first, mostly complete.

[@penningmeestercgkdelft9159]

Yes, that's exactly how I did it too!

[@shawnheidingsfelder8179]

My break in was in box 6. You have three circles all marked with the same color. If they were high, you'd have problems, the least of which is that you couldn't have 9 nines in circles. Even if you made them 6, 7,and 8, you'd have a hard time filling in the rest of the circles because you'd already be at 21 and you know you need at least 4 different digits to fill in the circles.

[@hystrixlignum8983]

I discovered this two days ago on LMG and solved it; and now it is on CTC 😀 What a nice coincidence. I will watch the video anyway.

[@mstmar]

a small oversight in the logic for purple being low at the start. simon said that if purple is low, they have to be 234s, but we could also have a 1 in purple and shift one of the 2,3 or 4 into the circles off the belt. what we can say however is that there is at least 3 4s on the belt and so some 9s on it and the rest of the argument still stands

[@mmmmmmmatssss]

Wow this was an amazing puzzle to solve and to watch. It took me 45 minutes which I think is quite good. While I solved it, it crossed the mark of 10k solves as well! My emotions at the beginning of the video were hilarious so let me walk you through them. First of all I was shocked when Simon chose EXACTLY the same colours as me. Then a quite funny dialog evolved. "So i think we have to prove that purple is NOT low digits." Huh?? "There would be four on the line. And if we put four here there would be nine nines in circles." Yeah and what's the problem with that? "Ah! So blue cannot be low!" Yeah.. After that I just leaned back and gave approving nods..

[@davidhughes7174]

A joy to solve. Thank you.😀

[@markp7262]

14:15 finish. A very nice puzzle, and not too difficult once you understand the break-in. Excellent!

[@uigrad]

25:28 for me. I started quick, but got hung up on the green lines in box 9. That was the hardest part.

[@chrispiasecki9324]

I started my solve by deducing where would 5 go, in the middle left 3x3 5 was either in the empty cell or the circle, and a quick attempt at putting 5 in the empty cell led me to the circle answers.

[@In_42_Space]

Wow first time I have solved one of these before I watched Simon do it. Not sure what made me attempt it (possibly the intriguing title). Couldn’t have done it without all Simon’s training on German whispers line tricks and circle logic. Loved it 🙂🙂.

[@HeadMed]

Normally I overuse the check feature but this time I only used it to double check that my 9s logic was correct (wish i hadn't though.) That was an extremely cool deduction and a very fun, approachable puzzle!

[@joppippoj]

but i'm already in love

[@Point-Zero]

Fantastic puzzle for beginners like me, solved in 00:55:27 :) Loved this 1 and the logic

[@dVTHoR]

49 minutes myself which I am exceedingly pleased with.

[@Gonzalo_Garcia_]

10:06 for me. A dumb mistake set me back a couple minutes, but luckily it didn't take too long to fix. Great puzzle!!

[@LednacekZ]

8:53 today. nice interdiction difficulty of sudoku. easy one for beginners.

[@randomjunk1977]

My way of working out the numbers on the lined circles was to just look at it like this: You have a set of 9 circles whose numbers add up to 9 and a set of 10 circles whose numbers add up to 10. One set can only have low digits, the other set can only have high digits. Well, the lowest 2 high numbers (6 and 7) add up to 13. So you have to just go with 9 as the only viable high number and it fills the set of 9. From there it's fairly trivial to realize the set of 10 numbers that have to all be low has to be 1234 and then of course the last 5 circles are 5s.

[@piarittersporn]

Absolutely wonderful puzzle.

[@eepopgames2741]

I followed a similar scheme of alternate coloring for the belt for the break in, but instead of looking at row 9, I was attracted to box 6. There we see there are three Purple digits in Simon's coloring. But even if we used the absolute lowest high polarity values of 6, 7,8 those alone would account for a whopping 21 of our 24 circles, but without being able to use any of the blue circles (since purples would be high on this path of logic) and there just simply aren't enough circles to cover that. That tells us that Purple must be low. Could do similar logic on column 2.

[@pickledcucumber8693]

This was a nice fun puzzle to solve!

[@longwaytotipperary]

Im glad you mentioned that you made a Strands video this morning. KZbin “forgot” to let me know. Ha ha KZbin - I found it anyway!! 🤪 looking forward to that video! This puzzle is fantastic!!!!

[@davidrattner9]

It didn't let me "forget" 🫠. Every puzzle that Simon does is fantastic!!😊😁

[@longwaytotipperary]

@@davidrattner9 I don’t know what happened. I’m a patreon & subscriber and normally (I hope) receive notifications of all the videos. But not for the Strands video. I think one time I wasn’t notified of a livestream also. What’s up KZbin???? After Simon mentioned the Strands video I searched for it and found it!!! I agree with you, my friend every video is fantastic!! 😊

[@praematura]

Got a few minutes into this and realized I'd make a BIG logic fail, so started over again and went a bit slower 😅, finishing in 12:56 (conflict checker off), but add a couple of minutes for anything I did get right from the first attempt! Wonderful puzzle, many thanks to Titus for it!

[@NZStarlight]

9 is "the most profligate digit"? Great wisdom from Simon.

[@Anne_Mahoney]

I actually laughed aloud when it became clear that there were circled 5s. I'd wondered from the very beginning whether it would work out that way.

[@Yttria]

Very approachable. Simple and elegant logic with the lines and circles. Blitzed it in 18:29 (even with initially miscoloring part of the circle line)

[@ronjohnson6916]

Cute and clever. Loved it.

[@MissVindicat]

Yes! Just in time. :)

[@johncox7169]

When I was doing this puzzle, as soon as I realized the 9s, I immediately unwound the line in box 4. It is funny how much better than me Simon is at Sudoku and yet he misses things that I find so obvious. Anyway, very fun puzzle.

[@jeffreyrosas1784]

At 19:12 Simon, I wonder if you would see the pencil marks and found digits better if you shaded with a different color than that blue. R5c2 is clearly an 8. At 23:11 you immediately found the 1 in box 5 in the same basic configuration, and did not fix the 8 in box 4. At 28:12 you raced around the grid in one of your amazing progressions, and I expected you to find the 7 in r9c2 as quickly as you had found the others, but it seemed you did not see the 8 in r5c2 and stopped. Maybe the light blue on the third page of Sudokupad color pallets would provide more contrast. Thanks, as always, for a very entertaining video.

[@HackerAtesh]

There is a much simpler break-in to this puzzle. Spoiler warning for anyone who hasn't solved on their own yet and would like to First, it's possible to deduce that the circle in r8c2 is a 5, because the only place a 5 can go in row 8 is column 1 or 2, and the only place a 5 can go in column 2 is row 8 or 9. From this, you need to place four other 5s in circles, and the only possibility is to take up the four remaining circles that aren't on the whisper lines Then, you only have the circles on the long whisper line remaining. There can only be a single repeating high digit, because any combination of two or more high digits would take up way more than the circles allotted by either polarity. Your choice is between nine circles or ten, so 9 obviously has to go into the polarity with nine circles

[@Xiuhtec]

Solved in 19:36, and that was a wonderful time!

[@wesnik111]

Sorry if this is stupid, but I don’t understand why Simon’s reasoning around minute 17.00 confirms that there are 9s in the circles on the belt. Could there not have been 8 and 6 in circles instead, with nine of those 6/8s being on the belt and five of them in the circles outside of the belt? I thought we needed to find the circled 5 in box 7 to confirm that it was 9s and 5s in the circles rather than 6s and 8s.

[@torbenstein7251]

I was about to type the same thing, good to know I was not the only one thinking about this (and getting confused because i tried it on my own and couldnt figure it out). I do see the logic clearly when others stated that you can work out that 5s have to be circled, but without this being know first I do not see how Simon actually proves that 9s have to be circled... really hope someone can clear this up for us :)

[@icepyrox]

I was stuck for a very long time because i didnt count my circled digit in r8c4. I ended up watching Simon work that out and smacked my head so hard. The ENTIRE grid was marked and largely colored. Solved it in just a couple minutes after that as it all unraveled. 94 mins total. Was stuck for over 45 minutes. Ugh. Feel dumb since I used circles for everything up to that point

[@Kinada]

If you look at row 8 and column 2 they force a 5 into the circle, which leads to forcing the logic that you started with for purple and blue.

[@from1runner2another]

Column 2 is where you start. There are three circles with the same high/low parity. If they were high, they'd need to be one each of either 6,7,8 or 9. Minimum value 21, leaving just three circles for low digits ...

[@MarushiaDark316]

Another easy way to rule out purple being high is to note there are three purples in Box 6, the minimum of which would need to be 6, 7, 8 which add to 21. Not only are there not 21 purple circles, there are not 21 circles on the line period, let alone the fact that the remaining circles would have to add up to three, so either three 3's or a 1 and two 2's, which would break the line somewhere.

[@CharlesGregory]

I was confused about when Simon places all the 9s and then the five 5s. Question being: why couldn’t it be eight 8s and six 6s? (Answer being that one of the 6s would have been on the green belt, necessitating two 1s, which is too many. But Simon didn’t mention that.) Not sure if I wasn’t paying attention to his explanation enough?

[@CharlesGregory]

Apologies, just read another comment from @steve470 explaining it. Used the 4-9 rule vs the 6-1 rule!

[@5t757]

11:47 for me this time, indeed it's a very lovely puzzle!!

[@grahamania]

00:25:40 for me. Wonderful puzzle. Well done Titus! Kind comment.

[@Orenotter]

The highs I put is the red hues The blue is for three, one, for, deuce. But the green's out to lunch In the first color bunch So the fives end up colored chartreuse.

[@林老師-i5d]

28:19 for me nice puzzle with a interesting break-in

[@Antiknight]

00:08:18 for me! Easy puzzle with a cute idea :)

[@jussikuusela7345]

Fun puzzle.

[@MaierFlorian]

The deduction that blue cannot contain a 1 is wrong, you could easily have 1234 amongst blues and have the missing tenth digit appear in another not lined circle. Fortunately, this doesn't affect Simons conclusion that he drew from blue being low :)

[@IanMcGarrett]

I worked out the circles logic really quickly but the puzzle took me 37 minutes.

[@chipsounder4633]

This was quality.

[@flsal27]

I'm not sure which path Simon took. I was able to identify the 5s in the circles first, then the logic regarding the high-low numbers, and the 9 falls directly.

[@iuriikononenko9238]

What an easier logic to try making purple high, 3 purple would be at least 678 and 10 blue already out of circles

[@irc_ninja6906]

22:53 Very good easy puzzle !!!!!!

[@JohnRandomness105]

11:00 Is Simon tempting fate in arguing that purple can't be low? It took me a while, but I eventually figured out what had to happen with highs and lows on the line. Nine blues and ten purples are very much relevant to the line.

[@Coyotek4]

18:34 ... I'm getting better at these 'circle' sudokus Nice puzzle!

[@iris.holmes]

After coloring the land grey and water pink, Simon keeps on breaking conventions by making low digits purple and high digits blue... 😅

[@Tringard]

A bit more sudoku in this sudoku puzzle than I wanted, today's title should have been a hint I suppose. Nice bit with the circles though.

[@srwapo]

12:09, saw that I needed to count the circles on the long green line right away, took me a bit longer to be pleasantly surprised that all the "high" digits had to be 9's because of it.

[@MeriaDuck]

At 19:20 here is a question, will we switch to the usual blue 💙 and orange 🧡 for high and low? Guess not 😂

[@RichSmith77]

We need to ask Mark to have a polite word on our behalf.

[@bait6652]

That was a fun one...made an err when i counted 24 but end up havinf only 23 circles(P&P) leading to 67 being part of the count.and had to come check what went wrong....missed drawing the B7:5 circle

[@JCGodartSudoku]

I started counting circles of opposite polarities and noticed whichever the low, it must contain some 4s and therefore the high must contain some 9s, so 9 9s in the circles...

[@florenciagindarte]

I always wanted to know how do I ask for a happy birthday from Simon? haha

[@Rukimix]

Took me more than it should have because I forgot about the rule where circles tell how many circles contain that digit, oh well

[@nekogod]

If purple was high you would need 21 high circles because of the 3 circles in box 6 being a minimum of 6, 7 and 8, but even if you included the 5 circles not on the line you'd only have 15. It's now 8,600 people in 3 days

[@Aliessil]

Finished in 28:40, but ended with a deadly pattern in rows 1 & 3, and no way to resolve them 😞 By the time I'd gotten to this point I'd forgotten all about the circles! 🤣

[@RianneOK]

This one is fun and i see how to solve it but i keep making mistakes because it's too late and i'm too tired. I will have to try again another day.

[@stuartharris2165]

Do we need to buy popcorn for Saturday then Simon?

[@stephenmccarthy1795]

9 high circles plus 5 makes 14. That’s 14 circles made up from the digits 5 through 9. The two ways are either 5 and 9 or 6 and 8. Ultimately, 68 does not work, but I think Simon elided over the question of whether it would work.

[@steve470]

He didn't need to consider that. As soon as there needed to be circled 4s on the line, there also needed to be circled 9s, eliminating the 68 possibility.

[@stephenmccarthy1795]

@@steve470 of course, the 4s forced the 9s. He may even have said that, but without making the point explicitly, I feel.

[@tBagley43]

21:45 good puzzle :)

[@mudscuffer]

18:52 for me. Fun puzzle.

[@BryanLu0]

Solved in 10:24 First you can deduce that the high digits must be 9s. Then there are 15 remaining circles. 10 circles on the line with 1234. The remaining circles are 5 or less, as there are only 5 remaining. 12345 = 15

[@jurgenbaumann67]

I found purple as low by saw 3 purple circles in Box 6 or coloum 2. 6+7+8=21, but 10+5 is only 15.

[@chitraagarwal8259]

Column 2 gave away that purple couldn't be high

[@jacksontejada]

19:58. I solved for the 5s first, then the logic of the line was easy to figure out. Great puzzle!

[@penningmeestercgkdelft9159]

37:50 for me. :-) Nice puzzle indeed!

[@LithmusEarth]

The green lines that are are not circled, Almost looked like CTC, but roughly.

[@BlueCyann]

Doesn't make me love Sudoku, because all those lines and circles are hard to keep track of when your eyes aren't the best, and I thought there were only 23. So I had to do a lot of it twice.

[@xerodeus2337]

I saw that there were 9 circled 9s. Where's the circled 9 in boxes 2, 5, and 6? It can only go in one place. And then you can sudoku the rest of the 9s

[@gerwalhue]

Not so clear to me why the 9 blue circles on the whisper line had to be nines. If the 5 circles not on the whisper line were also blue, the 14 blue circles could be alternatively made of 6 sixes and 8 eights, couldn't they? That's why I first checked, that the 5 circles not on the whisper line had to be fives and so could neither be blue nor purple.

[@Sinisest1121]

It was strange to think about normal german whispers but cant place 4-s as all 9-s are already placed.

[@Thegeektoendallgeeks]

00:48:14

[@MNalias]

Incorrect. It didn't make me fall in love with Sudokus. It made me fall in love with Sudokus again.

[@RichSmith77]

It used to be the case that purple and blue were the most complained about colour combination for the colour blind. I think he deepened the shade of purple, so maybe it's not such an issue any more. But he usually makes a point of picking orange and blue, saying that he believes they're the most colour blind friendly combination. (Not to mention, Mark would always switch to using blue for low digits and orange for his high digits. Not for Simon though. Blue can be high and purple can be low. No channel consistency 😔)

[@CharlesGregory]

Nothing will beat the island puzzles where he makes the land blue! Buster Bluth would be proud!

[@ceevio_art]

You must realise by now that Simon likes to colour puzzles using the darkest, dullest, most vision-obscuring colours that prevent him (and everyone trying to watch his vids) from scanning his pencil marks with any ease. Using 2 colours like bright yellow and bright blue is simply out of the question! Dark purple and murky blue are perfect for achieving this, (along with a dark green and a dark grey if he needs to use more than 2 colours.)

[@alanclarke4646]

39 minutes. Not bad considering I have dilator drops in one eye and a very small screen.

[@cameronbaydock5712]

17:00 If the circles not on the German whispers are included, there were 14 non-low circles. Could these not have been comprised of 6 and 8 as opposed to 9 and 5 (theoretically)?

[@theredstoneengineer6934]

6:15 for me

[@stangerrits6712]

This man's colouring schemes... I thought we all agreed blue is low and orange is high? What happened? And how is Simon not completely disctracted by using blue for high digits?

[@yashmehta9299]

25:28

[@wanderlustwarrior]

20:01 for me, but I made one mistake in the sudoku section and had to fix it using the video.