The Sudoku Made Of ONLY 5 Green Lines

[@nordy1220]

Nordy here. Thanks again for the feature :) it’s always so fascinating to watch you solve a puzzle. Aside from the small Sudoku detour in the middle (which wasn’t a waste because it made the endgame easier), you actually found an even smoother solve path than I did while testing. I just love that-you think you have something nailed down air tight, and someone comes along with a new idea to shift your whole paradigm. I imagine many setters have had that same experience while watching this channel. Cheers!

[@davidrattner9]

As usual another great puzzle from you nordy!!! Continue to churn out beauty's. Look forward to see what you bring to us next!!

[@Anne_Mahoney]

Sweet puzzle -- a clever use of overlapping rules and a sub emerging out of the grid.

[@ericpraline1302]

Thanks for a fun puzzle. What did Simon find that you didn't envisage?

[@glennmelven3414]

Even though the checker said it was wrong, the easiest way to verify it was to see that the only conflicts were with the outside digits.

[@jlashombjr]

I just left the outer edge as single center pencil marks, then when checking ignored any errors in the outer ring.

[@inspiringsand123]

Rules: 04:49 Let's Get Cracking: 07:24 What about this video's Top Tier Simarkisms?! Maverick: 4x (00:48, 00:48, 26:25, 26:37) The Secret: 3x (07:32, 08:14, 10:20) And how about this video's Simarkisms?! By Sudoku: 21x (13:21, 13:23, 16:15, 16:55, 19:03, 19:03, 19:39, 21:49, 22:15, 23:48, 24:41, 28:43, 32:24, 33:48, 33:53, 38:29, 38:52, 39:48, 40:38, 40:50, 44:30) Ah: 13x (17:10, 17:10, 18:19, 18:24, 22:27, 25:09, 26:20, 30:23, 34:26, 36:12, 40:38, 42:24, 42:56) Clever: 8x (24:24, 24:24, 28:47, 33:13, 33:13, 45:39, 46:00, 46:16) Lovely: 6x (17:10, 20:44, 20:44, 36:41, 36:44, 46:26) In Fact: 6x (06:23, 10:05, 13:03, 28:40, 31:35, 37:09) Sorry: 5x (00:53, 03:55, 04:07, 04:07, 30:20) Beautiful: 5x (12:16, 17:30, 34:39, 40:10, 40:12) Brilliant: 4x (03:23, 04:41, 04:43, 04:47) Progress: 3x (33:02, 35:24, 37:43) Wow: 3x (31:18, 32:59, 35:58) Nonsense: 2x (25:52, 31:57) Naughty: 2x (00:24, 33:13) Hang On: 2x (26:45, 27:56) Nature: 2x (10:12, 12:21) Cake!: 2x (01:21, 01:30) Good Grief: 1x (31:24) Goodness: 1x (44:37) The Answer is: 1x (20:48) Approachable: 1x (04:34) Surely: 1x (22:27) Disappointing: 1x (06:43) We Can Do Better Than That: 1x (10:05) That's Huge: 1x (25:09) Most popular number(>9), digit and colour this video: Ten (5 mentions) One (103 mentions) Purple, Yellow (13 mentions) Antithesis Battles: High (19) - Low (15) Even (3) - Odd (0) Outside (3) - Inside (0) Row (23) - Column (21) 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!

[@SellymeYT]

21x "By Sudoku"s? You'd almost think it was a sudoku puzzle with that many.

[@lydiamaeser6908]

I LOVE THIS HAHAH

[@paranoidjay]

Could you do the channel Project Farm?

[@yeehaaw]

i think the auto captions mishearing him say “Nordy” as “naughty” threw it a little off this time :-( (i love the work!!!! this is not slamming you)

[@smylesg]

It's high time they start pinning your efforts.

[@maralenenok]

It took me a couple of hours and a couple of small hints from Simon, but I solved this one! I thought it was pretty tough, but I wouldn't have been able to get anywhere at all with it a month ago. Thank you Simon!

[@Jeremy-hk9cx]

Whenever Simon uses the word "approachable" my heart sinks a little.

[@troymcg]

hahaha

[@majestic07]

Thanks Nordy and Simon - that was a lot of fun. I like the bit where the column 5 sandwich clue disambiguates the polarity of the middle whisper line.

[@HunterJE]

So frustrating seeing Simon keep shying away from the 2/4 sandwich row like it was a hot stove when there was a quick easy win there if he'd just look at it for a moment, namely the 1 in box 7 has to go in row 9, because 2/4 needs to be a one-cell sandwich, which would have huge impact on the remaining 1s and 9s in the grid (He got to it eventually but could have had it so much earlier)

[@pelahnar4]

right? even as he said "I hope I don't have to look at this row in depth" there was already the 9 in box 7 dictating all the logic that follows

[@RobertSmith-ot2yh]

Yes, also at 32:26 there are only 2 places left in row 8 for a 9, and one of them obviously doesn't work! Finishes that sandwich.

[@RobertSmith-ot2yh]

Sorry, 33:42... The other spot was were I was yelling at him to put the 9 in box 7, which would have then made my last comment correct.

[@piarittersporn]

That was a huge puzzle. First, I completely misinterpreted the rule for out-of-grid digits, which may have been a translation error. So I had to restart twice because nothing worked. Then I ignored my wrong assumption and was able to solve the puzzle..... albeit very slowly. All in all, I found it absolutely exciting.

[@Coyotek4]

38:49 ... a fascinating puzzle that is truly not overly daunting (though 'approachable' may be a bit of a stretch) Nice puzzle!

[@Halfbeasty]

Just about 47 minutes. Very lovely and indeed approachable Sudoku. I mistakenly spend the first ~10 minutes misunderstanding what the boxes on the outside of the grid ment, but once I noticed the logic came to me pretty easily. Amazing puzzle and of course, amazing video ^^

[@Gnarlf]

Very nice one and elegant one. I really enjoy these "no digits but rules" Sudokus and this ruleset was very straight forward and yet challenging for me

[@CaptainSpock1701]

KZbin sometimes has those "most paused videos" recommendations. They are always the wrong videos. The most paused videos are Simon's videos. The amount of times I clicked on a video to fill in pencil marks or numbers only to realise it just pauses the video, is way beyond countable already.

[@Jigkuro]

I do most of the puzzles on this channel. I loved this one in particular. The logic path was beautiful and always detectable to me; while I often get stuck, this puzzle just flowed.

[@lewsouth1539]

First try: After placing the 8 & 9 in c4/b2, I stupidly ruled out those digits on the green line at the bottom of c4, & broke the puzzle about 30' in. Only figured out my mistake after starting over, and finished in 41:48 after restart. So, one blunder & a second-try time only ~11.2% longer than Simon's-I guess I did pretty well! lol

[@fefo9445]

😅 Made the same mistake and was really confused, because the logic till this point was straight forward. After a few minutes I figured out the mistake.

[@vitowidjojo7038]

28:49 No, that's actually really clever. Too clever in fact. Most of us would use the 19 pair first, but you used the sandwich rule instead.

[@sehrentamilselvam309]

Cracked it in 60min. Love the puzzle. Kinda happy I wasn’t that far behind Simon

[@Steev42]

I was pleased with myself on this one, but I got stuck after a while and had to turn here. Fortunately, well before Simon got to where I was stuck, he pointed out that he hadn't used the sandwich in column 3, and I realized I hadn't either. That was the kick I needed to solve the rest of it. Very nice puzzle.

[@mikepictor]

42 minutes. Despite a slightly longer time, it never felt THAT hard, I was never really stuck.

[@Censeo]

This is the channel we really can't afford to lose. Logic is just something I can't imagine being unimportant in any future

[@hockeyhacker97]

26:54... We have a 1/9 pair in this box... can this other cell also be a 1? No because this round about logic of the outside clue as a pose to the fact we already have a much simpler logic of the fact we have a 1/9 pair set up. 28:36 ... Using the same round about logic to eliminate a 1 from a column that already has a 1/9 pair in it. Gotta love the Rube Goldberg logic for the simplest solutions.

[@reganmartin4126]

41:44..."I think we have to carry on with Sodoku a bit longer".....and then instantly doesn't! LOL I love that!

[@theashen]

45:46 - very nice logic and quite approachable

[@markp7262]

29:44 finish. Though it probably didn't need it, I started doing sandwich coloring once I had resolved the top whisper lines (and erased THAT coloring). Excellent puzzle!

[@ericpraline1302]

Good combo - some neat logic and fairly approachable I'd say. Funnily enough I worked out the order of the row 1 line using a clue on the left rather than 6s.

[@markbennet9058]

Why not get into the habit calling 46 in whispers the "problem digits" rather than "extreme digits" - or to be more technically correct "middle digits" - but I think problem digits is more evocative and memorable.

[@pi5549]

Interesting. After a week of finding this channel my chess rating has gone up 100 ELO, and my debugging skills are noticeably sharper. I also become more apt with time at following Simon's logic. Challenge is to strike the balance between honing and bingeing.

[@harmicknazarians5155]

Great solve, loved this puzzle. At 31:30 you can also tell that the Row 7 Sandwich needs to go Left of the 1 since there is no where to place the 9 on the right side of it (a 9 in r7c9 would make the column 9 sandwich break)

[@lilywashere27]

THIS one is the first one I was able to solve! I am not experienced at all in variant sudoku, so I'm very proud of myself (even if it took me 3 hours...but that's ok, it was nighttime)

[@jasonveale8467]

Really enjoyed this puzzle. I'm no expert and I was able to solve this one so I do agree that it is approachable. Interesting combination of sandwich and German whisper lines. Thanks Nordy and CtC 🙂

[@jonhansen9622]

Very nice solve! Happy to hear you're testing negative for the "C"

[@longwaytotipperary]

Yes!!!!!!

[@warren_r]

47 minutes for me. Not great, but in my defense, I'm sitting at an airport lounge, so it's just constant Mavericks around here. Good puzzle. I really like these outside-sum variants.

[@andrewnanninga1966]

Managed to do it in 46 minutes! This was a fun solve!

[@kathyjohnson2043]

As for this puzzle being 'approachable', I would think those who have done a lot of sandwich puzzles and a few German Whispers would be ok. The rest of us are baffled. We follow your logic completely, and seem to understand every step. But, just like when we were back in school (math/maths), even though we were sure we understood every step the teacher demonstrated, when we got home we didn't even know how to begin! (BTW, my spell checker says that maths is not a word.)

[@Jodawo]

Rocky Roer did one similar with RenBan Lines called RenBan Sandwiches. Wouldn't mind seeing that one featured.

[@heitron81]

Thank you so much for sharing all your thoughts!

[@damadclown]

I managed to solve it without help although taking quite a bit of time. Ps: I just noticed on the description that this is a more approachable one which might explain why I was able to solve it. Anyway, a W is a W so I'll take it and try Mark's tomorrow morning

[@theunwelcome]

the green lines mean the sandwich bread is moldy! I'm throwing it out! clever puzzle, Nordy (when Simon says your name, it sounds like naughty, which I'm not sure is intentional?)

[@ypkoval]

It looks like Simon's home is moving itself gradually towards a military airbase. It started with relatively innocent Maverick testing its wings, but now it all sounds like a bunch of B-52s flying back and forth to Tesco on a daily basis for some beer on sale

[@zoicon5]

This took me almost an hour, but it was fun.

[@crystalgehrt8861]

Such a cool puzzle.

[@Raven-Creations]

When considering the sandwich in C9, first you asked if the tip of the line could be 1, when there's a 19 pair in the box. The real problem was that you hadn't realised that the 23s on the line had to be different, because the one in the border was the same as R6C8. This ruled out 7 from R5C9. The 8 forced the sandwich to go downwards from R6C9, and had to take two cells, so there was a 19 in the corner. You went to great lengths to show that R6C4 couldn't be a 1, using maths and sandwich logic, but there was a 19 pair in the row. You could be looking at a class action from all the people with flattened noses from continual facepalming. You missed so many things in this, often because of your inability to either use your pencil-marks, or update them after making a deduction. Sometimes, it was just that you didn't really think about what you were doing, for example, when the border clue in R8 was 24, you looked at the 1 pencil-marked in R8C1, but somehow failed to realise it couldn't possibly be the 1. This puzzle really wasn't that hard, but it was very enjoyable.

[@stevieinselby]

I got confused to start with because I thought that *all* rows and columns had to have sandwich sums that were single digits, and that broke the puzzle. Then restarting once I understood the rules, it went much better! I took a different route to disambiguating the polarity of the first row - 1 and 9 obviously can't be adjacent to each other, but nor can they be a single digit apart, because that would make them the same polarity. So they must have one high number and one low number between them, with those two numbers adding up to a single-digit total, which has to be 2+7=9, fixing the sum on the left-hand whisper line as "high".

[@stevieinselby]

@@billevans7488 No, I mean *all* the rows and columns, including the ones without a white cell to put the sandwich sum in.

[@peterbriggs3408]

You missed an opportunity for a song. Over the Lancashire Hills (Swarbrick & Nicol) includes the lyric "It carries five lines, of a critical kind, It wouldn't detain you too long"

[@tormuse2916]

This was a nice puzzle, once I was able to understand the rules. I believe the rules should be re-worded for better clarity, because I was quite confused going into it. It says "each of the ten cells outside the 9x9 grid" without saying which ten cells. It would be clearer if it said "each of the ten cells outside the 9x9 grid that is on a green line." Also, the use of the word "inclusive" threw me; I initially read that to mean that *every* digit from 1 to 9 must be outside the grid. (Which I quickly realized was impossible, since 1 can't be out there) I think it would be clearer if you simply remove the word "inclusive." If these two changes were made to the wording of the rules, I think it would help people avoid the confusion that I experienced trying to solve this. As it is, I had to check the video to see how Simon did it to figure out what I was supposed to be doing, which I generally don't like doing before I've had a chance to take a "crack" at it. :)

[@francoisduez601]

33:15 Nice logic The break-in is easier than it looks at first, but interesting nonetheless

[@leickrobinson5186]

Yay! Hearing Maverick makes me happy! 😊

[@ivanzivkovic7572]

47:23, could've been faster if I noticed earlier that I didn't use the 2nd clue on top of the grid yet (9) after putting in the 9 in box 7 and was wasting time on harder sudoku conclusions. cool puzzle and ruleset :)

[@violentbob]

Simon often makes me question my sanity but am i stupid or are that 5 lines

[@vitowidjojo7038]

OH GOD THAT'S INDEED FIVE LINES

[@no_name4796]

They actually changed the name lol

[@no_name4796]

Btw the title is quite the same as the one of their most famous sudoku... (At least that was before they changed the name)

[@Pixelarity64]

What was the name before?

[@violentbob]

@@Pixelarity64 it said 4 lines

[@th.nd.r]

Great setting and solving once again, several clever moments and cool concept and ruleset as well! Note: the bottom sandwich clue did not get its yellow flash!

[@derekmacintyre8960]

I did this on the app, and found it a bit frustrating that it doesn't "solve" at the end haha! Took me 80 mins... Super fun puzzle though! I had to come to the video to see if my solution was broken for some reason, but seems like just a limitation in the app.

[@emilywilliams3237]

A very clever puzzle, by the looks of it. Yes, I may try this myself in a day or two, but tonight I just enjoyed watching Simon solve it. So fun! You are always a pleasure to watch, Simon. Tonight's word of note: "replete." I think of that as the way I feel after a big meal (or a lot of cake 😊) but it can have a more general meaning of simply well-filled with anything, not just food. I love thinking about nice words while watching you solve sudoku. Maybe the next time I solve a puzzle I'll think about which boxes are replete ... Thanks for this video and thanks to Nordy for the puzzle.

[@Gonzalo_Garcia_]

16:43 for me. Nice puzzle!! That’s a very clever way of using this constraint, I loved the idea.

[@Tsunami14]

I'd never be able to do this puzzle without accidentally using the sandwhich clues to eliminate cell candidates.

[@santisis]

65:20 for me, I was scanning like a stormtrooper at the best.

[@tedg1278]

Near 16:00 you look at R1C7 with its pencil marks of 123 and say in can be anything. That cell has a 9 next to it and is part of a row with a sandwich clue, the 1 and 9 can't be next to each other because 0 is not available to sandwich clues. It is really funny that 90 seconds later your brain picked up that detail when it contemplated the sandwich clue.

[@JalebJay]

22:17 colors of renban sandwiches were very interesting

[@SMTRodent]

I can't wait to see how this solves. Unlike Lasso, I'm leaving this one to brighter minds than mine.

[@thebearded_guardian3671]

It seems like in the last few videos that Maverick has been flying around your house more than airliners into Heathrow.

[@krbrower]

I’m making this comment before watching the solve. It occurred to me that the bottom-center whispers line “could” have a zero outside the grid and a five in row 9, which is an exception to the “no fives” rule, because it meets the rules of sandwich and German whispers.

[@krbrower]

Edit, I missed the clue that the outer digits were 1 - 9

[@sohein]

Missed a golden opportunity to say "Now how many nines have we got? One, two, three, ... fifteen?!"

[@jsadvent8240]

0:44 Simon can't recall a recent sandwich sudoku solve. How about the sublime AND ridiculous Phistomefel beauty back in March? The one with the massive anti XV constraint.

[@i8ate8]

Missed opportunity to allow zero on the whisper line outside the grid. Could have done a 0-5 and then 5 would finally be allowed on a whisper line!

[@THEJPIndustry]

I feel like i unlearned Mathe, cause for me that are 5 lines

[@Mujaki]

Not often you see a sudoku puzzle with column/row zero, and column/row ten!

[@corelialythi]

Do you guys also scream at your screens or is it just me? I was at 27:16 going THAT IS NOT THE ONE!! (pun intended) 😂😂

[@ElijahColeman]

Simon seems to be about ten times more likely to miss scanning a digit or pencilmark if it is shaded blue.

[@ceevio_art]

.. or if its part of a Sudoku puzzle😉😉

[@y_prime]

solved in 22:06 - had a surprising amount of difficulty with the candidates at the end

[@timbeaton5045]

@10:00 Mark going for the Battenburg cake?

[@einaudi3901]

"Hopefully that's self evidently obvious, but for those of who are... Unsure,"

[@chesquid386]

Simon please be the father to my child 😫😫

[@adrianhead6272]

Completed in 23m56s

[@Xiuhtec]

Took me 80 minutes but I got there. Sandwiches are not my strong suit.

[@fefo9445]

59 minutes I´m quite proud of me :D

[@ApesAmongUs]

Row 8 wanted to place 7 digits quickly and Simon just wouldn't look at it.

[@Ray-iu7hg]

43:14 less of fun, a little difficult to keep track of the rules, but not too bad

[@Jodawo]

Simon here is a Cryptic clue : Via, "It's up to you". Singing high notes with pseudo kangaroos. 4,7 (Can anyone figure it out?)

[@longwaytotipperary]

Will you eventually tell us the answer?

[@Jodawo]

@@longwaytotipperary Yes, if I can get some honest guesses. Why waste a good clue and nobody cares even try.

[@longwaytotipperary]

@@Jodawo I'm looking at it. No idea where to start. Any hints?

[@Jodawo]

Hint: Character on a very popular TV series that first aired in 1999.

[@longwaytotipperary]

@@Jodawo Thanks! - US or UK TV?

[@SuperJJAlexander]

You could have deleted the outside digits and see if there is any clashes in the 9x9 center.

[@wanderlustwarrior]

43:35 for me, and I'm happy with my time.

[@harryhenderson3636]

Did Simon make a mistake? I looked at the end of the vid. The sandwich clue in the top right corner says 9 but the numbers aren't adding up.

[@lizzyvv447]

I did it in 37 minutes! Not as hard as it looks.

[@yoyokid9102]

The link doesn't work for me sadly.

[@ZackJRich]

No one commented the fact that Simon forgot to color the last clue yellow 😂 I can't be the only one bothered by it

[@harryhenderson3636]

I don't understand Simon's logic. I've done German whispers before so I know how they work. At the very start Simon says 4 must go in a yellow cell but why can't go in purple? It easily go in the right hand end of the row.

[@harryhenderson3636]

Nevermind lol. I wasn't thinking about the sandwich logic. Simon just didn't explain it very well.

[@notsecure6855]

Why did the checker say it was wrong the first time? He didn't change anything....

[@Anne_Mahoney]

The checker saw an 11x11 grid with a lot of blank squares and a bunch of rows and columns with 2 of the same digit in them. It didn't know that the outer grey part wasn't part of the actual sudoku.

[@bruceh8043]

I finish in 33:35.

[@In.New.York.I.Milly.Rock.]

It's like every sudoku these days has almost no information to go off on. Give me something new! Wheres the Sudoku with 81 given digits?

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

31:25 for me.

[@ShaunGuth]

I don’t understand how he knew the sandwich clue on R6 (of the sudoku grid) was a 3 at 33:53 …

[@ShaunGuth]

Nevermind. It’s forced by the 2 being in box 6, he just did them “backwards” in the video and I paused before seeing the next step :x

[@actionic135]

OCD alert! One clue not marked finished at the end 🙂

[@Trizzer89]

How can an edge digit contain a 5 unless there is a 0?

[@stevesebzda570]

I'm having a hard time understanding how any of those outer cells adjacent to the 9×9 grid can be 1 or 9 [they'd have 1 or 9 as the sandwich clue and need 1 or 9 in the sandwich on the grid] I had immediately penciled 19 into the extreme corners because I didn't think they could go adjacent [they'd be saying 1 or 9 and need a 1 or 9 between the 1s and 9s in other words]. How are any of these wht 10 digits going to include a 1 or 9?? I'm confused. This is a sandwich Sudoku, yes?! Lol 😂😮😮😎☕☕

[@pelahnar4]

They are never going to be 1, but 9 can be a multi-cell sandwich, even a 3-cell sandwich using 2-3-4

[@stevesebzda570]

Oh, two-digit sums on the 9 . Where's the 1 go ["inclusive"] in those 10 wht cells on the outside then?

[@stevesebzda570]

@@pelahnar4 Oh, just saw you reply. Cool That "1-9 inclusive" ["including the 1 and 9"] is deceiving then lol. Thanks 😂😎☕☕

[@stevesebzda570]

@@pelahnar4 The rules say, "Each of those outer digits can be repeated as necessary." I think it should say "...repeated or omitted as necessary." [Because we'll be omitting the 1 lol ] 😂😎😴☕ [[Edit: the 1 at least lol ]]

[@stevesebzda570]

@@pelahnar4 [Doing puzzle] I know though. "Some of the digits 1-9 inclusive." , it might say. [Throwing "1-9 inclusive" [[in there]] sounds like all them lol ]

[@harryhenderson3636]

Sorry I'm not trying to spam I see now Simon was right lol.

[@Pritchie45]

40 minutes

[@LednacekZ]

30:50 for me. Not bad i think. Kinda disappointed that the solve checker does not check only the 9x9 grid. The software should know by now.

[@glennmelven3414]

BremSter has this same software on his channel and the checker always works with these variants, Sven has provided an option, it just has to be put in to the checker.

[@RoderickEtheria]

I'm sorry, but one of those at least is not a line.

[@karynmorton4843]

I hate to think you wouldn't show us a puzzle just cause you didn't solve it.

[@Anne_Mahoney]

Well, there was the famous Christmas video -- 2020 maybe? -- when Mark put up a video where he got bogged down and didn't solve it. And it was *miserable* to watch. No fun at all. So I'm just as glad they've not put up another non-solve.