Litterbug Sudoku

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Digits increase along thermometers from the bulbs. There is one path of orthogonally-connected ODD digits starting in the center square (r5c5) and ending in one of the four corners. This path does not cross any thermometer.
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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

[@143AliciaA]

Was only two minutes behind Simon and ten minutes behind Mark today, probably my best day of the year!

[@adammartin2431]

"Crumbs! This is surprisingly crunchy" has got to be my favourite CTC quote to date 😂

[@stevesebzda570]

Lol That's from the Village Scrap Collector picking a Snickers Bar off the ground and taking a bite. ( or a Nestlé's Crunch Bar) 😂😂 [[Edit: or the Village Idiot taking a chocolate bar out of the trash lol 😂 ]]

[@Swynndla]

"We have you Mr. Litterbug! We know everything you dropped everywhere, and it was some very ODD trash indeed" "Sorry, excuse my TRASH talking!"

[@julieenslow5915]

I couldn't stop laughing!

[@coryoubre1526]

Mark... I've been a fan of the channel for quite some time. As a suggestion. You're one of the best solvers out there. Don't be frustrated in your hangups. Even when you do get the break in... It's still incredibly ahead of most of us. Just celebrate the find instead of other self imposed goals. For me personally... The logic is more impressive than the speed. Promote the winning feeling above all because your skills are remarkable.

[@samlthompson]

Agreed! I enjoy this channel because Mark and Simon take the time to explain their thought process as they solve. This is what helps improve my ability to solve similar puzzles. No need to apologize that you are "missing" things that we may see. I'm sure when Mark watches his own solves he is plagued with these "missed" steps. However, solving these puzzles live, in real time, and letting us see and hear how you approach them is what I enjoy about the channel. Keep up the great work!

[@stefanliew3076]

Oh no! The village litterer has left a trail of trash in their wake! Luckily, Bob bins it.

[@jadeskyewalker]

How long you Bin sittin on that joke 😂

[@moonglum101]

*groan*

[@justanotherhobbit7215]

Mark : @13:58 "As so often, Placing a 9 on a thermometer does nothing" Also Mark @10:22 : *Doesn't place the 9 in the central thermo after placing the 8 in R6C1. I will openly admit I have the skills of a baked shoe compared to the fine gents running this channel, However it honestly pained me to spot something early that could have helped go completely unnoticed all the way to the end.

[@jnam23]

LOL. Yeah. Except placing that 9 would have also placed the 8 in the central thermo, and probably helped along the way. He missed that 9 for over 12 minutes!

[@mikepictor]

That was fun. I like the puzzles with a little narrative in them. The "path" is fairly easy to find, and it gives you some powerful tools, espcially in one box.

[@jcmarriott9723]

With an 8 in R1C6 (10:33) I have been screaming that in Box 5, Mark can put in the 8 and 9 on the thermo.

[@jnam23]

Yeah, that frustrated me too. He didn't fill that in until 22:51. How he missed that for over 12 minutes!

[@emilywilliams3237]

In touring older videos, I came across this one. What a great video - I noted especially that you have not changed, Mark, since this time: your way of expressing yourself, your way of describing what you see in the grid, your wit ("pardon my trash-talking'), and of course your overall friendliness. Thanks for this video, and for all that you (and Simon) have done to make CtC a continually wonderful place!

[@paulcook2961]

Two fairly easy puzzles today. I'm delighted to finish in roughly the same time as Mark.

[@Jodawo]

You'll be pleased to know the puzzle was charged with two crimes 1st littering and 2nd loitering. Mark gave testimony that this puzzle stayed over its 15-minute a lot of time and must now be punished. It's hard to believe that loitering is the more serious crime that was committed by this puzzle. ... all kidding aside I like the thought that went into creating the puzzle and the logic you went through in solving it.

[@omartrabelsi119]

I do believe there is a mistake when he removes the 4 from the 456 in the thermo and then removes the 5 from the cell to its left . Please corect me if I am wrong.

[@X07U]

I noticed that too. He should've removed 5 from the cell on the right. I was honestly hoping he would've noticed that, but in the end he got lucky and solved it anyway. Later he did actually notice the extra 5.

[@alienrenders]

You are correct. Another mistake. He should have removed the 5 from the cell to the right. I'm surprised Mark didn't see the naked single 4 in the center box right then. So it's easy to see a 4 go in that cell, but removing the 5 was indeed incorrect logic.

[@edensaquaponics1941]

@@alienrenders the 4 was a hidden single in box 5. A naked single is where a cell only has one candidate value, whereas a hidden single is where a number can only be placed in a single cell within a region (row, column, box).

[@alienrenders]

@@edensaquaponics1941 Tomato tomato.

[@smerriman]

Hah, I read the description under the video, but couldn't figure out what ODD stood for, so had to check the video itself. Whoops, now I get it..

[@AlRoderick]

Ironically in this village litterers are placed in the pillory and passersby are encouraged to pelt them with trash. It's what we call "entrapment".

[@swaggleboon]

I finished in 20:54! This is the first time my solve was less than the length of the video about it, so I'm pretty excited about it.

[@BrooksMoses]

Well done! I'm still trying to break 1.5x the video length. :)

[@georgeaman1938]

Thank you Evernerd and Mark. What a nice and approachable puzzle!

[@jdyerjdyer]

Very easy puzzle. Once you have the 4 in R4C4 (it is a hidden single, after all), the only path for the snake to go without crossing any even digits or a thermometer is down, left, up, left, and up to the 3 in the top left. The 6 in row 6 and the 4 in column 6 block off the 5 (even though we don't know their exact positions yet.) The 6 in row 6 and the 4 in row 9 block off the lower right 3. The 8 in column 4 and the 6 in column 1 block off the 2. There is a 9 and 3 in column 1 so the other three digits are 1-5-7 on the path and that leaves 2-4-8 for the remaining cells. Solving from here is pretty straight forward. Very fun puzzle!

[@jdyerjdyer]

Added benefit, this method doesn't require counting the number of possible odd marked cells, but either method is valid logic.

[@annalisasteinnes]

Am appreciating these easier puzzles. Just about the right amount of logic to keep me engaged without giving up.

[@siorac1147]

A nice puzzle, very much fun and shouldn't have been very difficult but I spent ages getting stuck on heartbreakingly, stomach-clenchingly obvious things. You know, like an 89 cell is very much disambiguated by an 8 in the same row... every puzzle is hard when you set yourself obstacles like that. (It also took me a shameful amount of time to even consider which direction our litterer can go; I just tried to will the central thermo to fix itself by I dunno, bowing down to my sheer resolve).

[@mathewolf]

I think there is a second mistake on 9:35 when Mark rules out the lower left corner because he counts the green square as odd. By the same logic the upper left would be impossible as well

[@veronikakeras8508]

The green square in the bottom left would have to be odd for the path to go there. But if the path goes to the top left the bottom left square no longer has to be odd which is why it isn't counted then

[@veronikakeras8508]

Hope this explains it well

[@JonnyBerkley]

Something that Mark missed at 9:52 - since the litter path occupies 5 cells in box 4 that are all odd numbers, the remaining 4 cells must all be even numbers. Therefore r5c2 must be 2, r6c2 must be 4, and r6c1 must be 8

[@JohnRandomness105]

6:55 Place a 4 on the thermo in the center block. Also, all even numbers are on the thermo. 8:25 I'm using gray to mark blocked-off paths, and green to mark the known path (so far just the exit). There's no need to color even numbers.

[@richardmead9785]

At 4:13 removes 5 from 345 in R4C4. Yet there is a 56 above it in the thermo. What ruled out the 5?

[@StNeurion]

This was a logical error: Mark should have eliminated the 5 in r4c6 @17:00 The actual digit in r4c4 was easily determined at the start though and would also eliminate 5 as a possibility.

[@stevieinselby]

It was a mistake, he should have removed the 5 from r4c6 instead.

[@RichSmith77]

I was hoping the incorrect removal of 5 from r4c4 wouldn't impact anything later in the solve, but technically, he did use it at 10:38 to place the 4 in the cell, making that, technically, an invalid logical step too. 🙂 I say technically, because there was a fairly obvious alternative reason for placing that 4, seeing as it was the only place in the box a 4 could go (even when he made the original error). So it didn't really impact the rest of the solution path.

[@FirstLast-gw5mg]

Like Simon I initially put off drawing the path (other than the 2 cells that clearly must be part of the path out of the middle). But actually, I later realized that the complete path can be drawn right from the initially given cells. Any corner requires a sequence of 4 odd digits to get out, but three of the four sides already have too many odd digits that are not on that path, so they're blocked by even digits. So it's immediately clear which of the 4 corners must be the litterbug's egress. The only next question is whether it makes a loop round the middle or takes a direct route, but again, you can only put 5 odd digits in a row, and in order to make a loop you need a row with 6 odd cells.

[@stevesebzda570]

Yes. I just noticed the 4 has to be in the top left in box 5. That's what I saw last night that made a quadruple in row two. The 1s are placeable in box 1 (r2c1) because of the 1s having to be in box 3 (row 1) from the beginning also. That's gonna do it. (I didn't notice last night the 4 was placeable in the box 5 ) That surely is going to do it though. [[Edit: a 45678 quintuple actually (after that 4 then 3 in column 4 of the box 5 was put in) in row 2 up top I was speaking of ]]

[@TheRaker1000]

this guy is mark, simon is the other guy. but, yes, i agree, the path is there early and not too hard to logic it out.

[@sebrofniloc]

Arrived at the litterbug's route by some different logic, but once that's determined the rest is just a grind without any further hard thinking. Good puzzle.

[@BozoTheBear]

Oh, very nice puzzle indeed. And this is the very first time I've ever solved it in shorter time than the video itself. I expect Mark's actual solve will be quicker than my 22:03, and he'd be faster if not talking, but I'm pretty happy with that! Now to enjoy his solve!

[@alarictaqiarentza9451]

34:02 solved for me. Took me a quite a long time to realize that there is just 1 path that could worked. After that the Thermo and Odd-Even constraints is working together very nicely. Very nice puzzle, Loved it!

[@tomtheultimatepro]

14:04 for me, cool puzzle, the path was easier to figure out than I thought

[@LednacekZ]

my thought exactly

[@grahamcase]

Great little puzzle. Loved it!

[@stevieinselby]

Completed in 26 minutes 👍🏻. Started with the path and then continued with parity colouring throughout, which I found helpful.

[@GenWivern2]

Hello gentlemen - this feels well and truly off topic for a sudoku video, but I generally give a heads up when a Maize crossword appears in the Independent in case you're interested. This time it's no. 10611, dated 15th October, and it's another quality item somewhat on the hard boiled side. Warm regards, etc etc.

[@joseffestejo7327]

at 10:29 of the puzzle after placing the 8 you could have unwound the puzzle a lot easier by checking the pencil mark on the thermo on r6c6

[@RichSmith77]

He managed to ignore cell r6c6 for twelve minutes! I really thought there was a chance it was going to be the last cell he filled. As it was, he filled it just 20 seconds before finishing the grid. By a different route. 😂

[@WillyBotson]

Remember, peeps, when you finish 1 or 2 minute behind, you’re more like 8 or 9 behind because they explain so much. These gents are top.

[@KinkyTurtle]

I assumed all green squares had to be odd, including that blank one at lower left, which threw me off for a little while. If that one were odd, there would be no possible path!

[@aronvanveldhuizen]

Yeah I had the same problem, only noticed it after a while though, haha.

[@jdyerjdyer]

Poor R4C4, such a simple opening overlooked and poor R6C6, resolved so early, yet left so late. These and the pencil marks I made for the path elimination (4 in column 6, 6 in row 6, and 8 in column 4) made my solve 100 times easier. I think his pencil marks were overwhelming him. I only marked the long thermometers at the start and that helped reduce the "litter", too.

[@kworbvids5516]

I was struggling with this for an hour and then I read the rules again and noticed "the path does not cross any thermometer"... oops

[@igronus]

The four in the ninth box could be placed at 10:25 instead of 20:55. Surprisingly.

[@nickjayyoung7662]

Can you do more Cryptic Crosswords, Mark? I would appreciate more of those, maybe try to get a 60 Sudoku-40 Cryptic Crosswords.....?

[@musicalcoder7699]

28.39!!! I think the very first day I was able to solve both puzzles done by Mark and Simon!!

[@kuraban1]

20:05. Rarely beat Mark's time, so very happy with that (even though I know he could go faster if he weren't keeping us entertained).

[@praematura]

Very fun to watch the solve, I liked the "Sorry, excuse my trash talking" comment near the end. :D Cool puzzle!

[@davidh.4944]

It took me exactly one hour, with a short break for a new cup of coffee. This was a fun one.

[@brischniak4810]

I think, he made a mistake at 4:06. Why can't it be a 5?

[@kevinyoung796]

If R4C4 was a 5, the rest of the thermo would have to be 6-7-8-9. The only way R5C5/R6C5 could both be odd then, which is 1-3, was if the thermo began 2-4, but the 4 in R5C9 prevents that.

[@stevieinselby]

@@kevinyoung796 interesting, I hadn't seen that, and I'm sure as anything that Mark hadn't seen it either as he hadn't even looked at odds/evens by then! I think it was just a mistake, he meant to remove the 5 from r4c6 but took the wrong one out.

[@khehir99]

I think Mark makes a logical error at 9:22 . He claims that the path cannot go to the lower left because that would require 6 odds in R9, but he includes the corner cell while doing so. AFAIK, there is no requirement that the green cells have to be odd.

[@JonnyBerkley]

If the path would have gone to the lower left then the corner cell would have had to be odd as it would be on the litter path

[@slomopanic]

I love how theyre always thinking way past what im able to. But often neglect the simple sudoku rules. while i still look at it with a more simplistic view and see number they're overlooking. i honestly wonder how differently the solve would have gone if the 8 in r5c6 was spotted right away?

[@BrooksMoses]

42:31 for me. That was rather fun indeed!

[@Jindychick]

This was a fun one after a hard day! Thx:)

[@tremkl]

Fun puzzle. I expected the path to be harder, but I also expected it to be easier once I got it. You know what they say about when you make an assumption!

[@Ruddigore]

I love to see puzzles that resist far into the solve.

[@fuji2086]

This was a fun puzzle. Took me about 23 minutes.

[@matthewmazurek]

I don't believe the logic at 9:30 is correct (the SW corner need not be an odd digit). The path to the SW corner is excluded by placement of the 8s: 8 in box 5 must be in c6, so 8 in box 8 must be in c4. Therefore, the odd-digit path cannot take all of r7r8r9c4, ruling out the SW corner.

[@glennmelven3414]

That was some odd litter.

[@stevesebzda570]

I'm seeing that quintuple up in row two again. [Wondered about it last night] [[ Edit: a 45678 on the thermo's in row two because of the 4 reducing it being in column 4 of box 5 (r4c4) ]] Happened because the 4 is placeable in r4c4 in in the top-left of box 5 on the thermo. That makes a 23-23 pair in box 2 (which makes a quadruple 4567 in box 2 ) which places the 4 up next to the 8 in row one (r1c6). Cool puzzle. Really cool, lol. 😂 [[3 months later: ^^What the frigg am I talking about up there?! Lol 😂 ]]

[@michaelhoffman2011]

Fun easy puzzle. 27 mins for me, but a good way to start a Saturday morning

[@ruru2500]

r6c6 for most of the puzzle was seen by the 8 in c1

[@rabidsamfan]

No idea what my time was as I had a phone call, but I got there eventually. I enjoyed this one a lot.

[@nityantagarwal2532]

Mark @ 3:19 lets hope we don’t have a logical error Also mark @ 4:04 that can’t be 4 so the cell before it(on the thermo) can’t be 5 Me: Wait what?! Some” not so logical “consequences at 10:36 (This is meant to be a joke please take it lightly)

[@davyj5216]

Interesting that there is a naked 4 right at the start at R4C4. Just sayin'

[@martinepstein9826]

*hidden single

[@davyj5216]

@@martinepstein9826 sorry, I am not au fait with the lingo.

[@edensaquaponics1941]

Likewise a naked pair (or triple) is when the same pair (or trio) of digits are the only candidates for 2 (or 3) cells in a region (row, column, box), therefore they can be eliminated as candidates from all other cells in that region. A hidden pair (or triple) is where 2 (or 3) digits are restricted to 2 (or 3) cells in a region and therefore all other candidates can be eliminated from those cells.

[@QemeH]

It is *really* irritating that all the corners are green. I don't want to spoil anything, but if you solved it using colours, you know what I'm talking about... Other than that, this was a very enjoyable solve - even if it took me longer than I would've guessed from the ruleset. Clever setting, though - the problem was definitively between screen and chair :D

[@stevesebzda570]

Ultimately, I'm going to try to do it without having to say the other two odd cells in box 5 must be on the thermo around the top and side (the 579). Oh crap, I just said it so it's going to be in my mind lol. Still going to try it another way. [[ PS: did it. I purposely put that 2 in last. The 1 actually was 1st anyway (along with everything around it). Neat puzzle. 67 pairs made another appearance (along with some triples in boxes and columns). [[3 months later edit: ^^ what the frigg am I talking about up there?! Lol 😂 ]]

[@ericveneto1593]

He can place 8 in he central box. Will unwind the thermo.

[@michaelmele3954]

I want to know how long it takes Simon to find the 123 triple in row 5 without pencil marking all the thermos.

[@stevesebzda570]

I'm gonna have to redo this one. [[Re-try solution]] It was a cool puzzle but I think there were a few ways to go about it and I screwed it up near the end. 😂 [[I was able to fix it, but it left me wondering. For instance, you could place that 1 up top in box 3 near the beginning sort of, (I don't remember ) lol]] [[ Yes, at the very beginning]] [[ Which places the 1 to the left (r2c1) in box one ]] This definitely warrants another shot at it though. (Maybe on my own) Because the very 1st thing I did was label-up that odd trail/snake coming out 3 cells, (including the center), 13579 in column 5. (And color-coding the odds/evens) Purple over the green odd givens covers that green nicely. Because the blue will eventually cover that other green cell without much contrast (it being Even eventually). ^^^SPOILER there. STOP READING (even though you've already read it maybe, lol) 😂 (I'll have to make it blue logically after a bit )

[@alienrenders]

28:37 was my time. This one was fun. Missed some easy logic early on.

[@matthewender3473]

I'm getting a bit better at spotting triples! And special for this one, conditions that restrict an even number and block a path :)

[@UllNvrWalkAlone]

Mark: I hope I don’t make any logical errors... immediately makes a logical error on the middle thermo 🤦🏻‍♂️ it’s ok we all have our bad days, me much more often than you 🤪

[@StNeurion]

That error was very minor since that digit was very easily distinguished from the starting position.

[@YuriSizov]

Maybe our guys are getting a bit tired from the daily videos? They deserve a break, there is no pressure!

[@bluefloyd1]

No logical error. The cells not on the thermo have to both be odd. So if R4C4 was 5, then 579 are in the thermo, and the other two would have to both be 2. He's keeping the spare odd digit off the thermo. Or at least that's how I read it

[@stanvandervoort2240]

@@jeromel2308 Yeah, he could have resolved box 5 for a long time.

[@dolf370]

Well, I did solve it, but my time was 1:15:10, so I'm probably the worst. But to my surprise I found the path very fast, but then had to fight for every digit, but enjoyed solving. But there's a question on the rule set, I made the assumption that also the "store" itself would be odd, I did not find it the way Mark did. So, depending on how one reads or understands the rules, I may have made an illegal assumption there and unintentionally made a bifurcation. But that's a question the setter of the puzzle would have to answer. Really liked the puzzle anyhow, a challenging level of difficulty for me, kind of the edge of my proficiency, but I did it. On a side note, don't understand why Mark colored the path red (or orange), I used green as that was what the store and corners already were, so why use another color?

[@robinisomaa]

I was only one minute behind Mark - personal best!

[@Raven-Creations]

That was a fun one. Based on what you did to this Mark, I can only assume you are the butcher in this town. Perhaps you're also moonlighting as a chef, because you certainly made a meal of it. So many things were missed today it was painful viewing. I daresay you've got a lot on your mind at the moment, with the kickstarter adding to your existing workload, so you can be forgiven for losing focus.

[@ewoudjan]

relaxing puzzle; the path was easy to find;

[@madsohm]

42:50. I mistook the information given as "ALL GREENS ARE ODD", but that was indeed not the case!

[@sanctionbuster]

37:20, with a little help to get started...

[@zacharygraham2293]

I feel so smart when I can spot a mistake or something he misses but I know I'd never get as far as him anyways haha

[@Moksoory1]

The views don't lie. Everyone prefers Simon's solves over Mark's.

[@RichSmith77]

This video has over 15k views at time of writing, so I don't think you can logically deduce that "everyone" prefers Simon's videos.

[@Moksoory1]

@@RichSmith77 Simon's videos get more views.

[@stevesebzda570]

@@RichSmith77 lol This has 6.8k right now lol 😂 (Just saying though) I like em both lol 😂

[@stevesebzda570]

@@RichSmith77 lol I refreshed 13k now (I must've had to refresh) So you're right. It's a lot. 😂😂

[@RichSmith77]

@@Moksoory1 Which allows us to deduce... ... Simon's videos get more views. Maybe because his videos get released first? Perhaps some people only have time to do one puzzle/ watch one video a day? Maybe the timing of Simon's videos suits more people? Or, granted, maybe he's more popular. But to say the numbers don't lie, and claim they show EVERYONE prefers Simon's videos is clearly nonsense. The numbers don't lie. They say more people tend to watch Simon's videos.

[@pimlaeven8561]

I notice many of these sudokus have been created by Dutch people. I am Dutch myself, but I wonder if it is true that relatively many people in the sudoku world are Dutch or is this a misconception?

[@efa666]

Nice puzzle

[@nblack2867]

I'm actually surprised you missed the 4 in Box 5 at the beginning of the solve.

[@facilvenir]

42 minutes. It was very entertaining.

[@Coyotek4]

17:47 ... would have been faster had I focused on the pathway right off the bat. Nice puzzle!

[@Qazqi]

No kidding. I didn't realize it would be so restricted, so I didn't even check it for way too long: i.imgur.com/CSulhbu.png

[@erickehr4475]

A nice puzzle. I’m not sure the hidden path added much to the puzzle as it was fairly easy to work out the only possible path before embarking on any sudoku. It would have worked better if there were multiple possible paths well into the actual sudoku solve. 15:14 for me.

[@StNeurion]

The path was pretty crucial to finding the solution. I would say that finding the path as the key to capturing the criminal would feel unsatisfying. Good thing you analyzed the entire crime scene to properly prosecute the litterbug!

[@MadScientist212]

24:23, one of the closest times I've ever gotten to Mark!

[@Lambda.Function]

That 579 triple survived forever in row 5.

[@LednacekZ]

IMHO starting with the thermos made your solve a bit "littered" with numbers. Missing obvious doubles and triples is not Mark's usual style of solve. I started the solve on the path then added the termos it made the solve cleaner and faster.

[@BobertJoe]

This would have been a much simpler puzzle for you if you hadnt missed the 8 being placed in box 5 at the 10 minute mark

[@Tom__Cook_]

34:22. Nice Puzzle!

[@adrianhead6272]

Not too difficult today - you can rule out most of the escape routes quickly, and knowing that route is "odd" makes for an "easy" solve - 23m50s.

[@adrianhead6272]

Interesting choice for the colours... I just used green for the route (as the greens are all odd anyway - the givens at least), and anything I ruled out I coloured red. That made the route pretty much self-evident.

[@adrianhead6272]

15:31 "Surprisingly crunchy"??? You have at least three given digits!!!

[@user-A168]

Good

[@FactFiveTV]

At 9:35 I don't understand why you rule out the path going to the lower left since the lower left square is (as proved later) an even digit (so the bottom row COULD have 5 odds and the path was viable). Any help?

[@annuwka401a]

lucky guess:) look at columns 4 and 6 - what are the possibilities for number 8?

[@RichSmith77]

If the path had exited in the lower left, then the corner square would have had to be odd, giving six odd squares in row 9. It could only be even in the final solution because the path didn't exit in that corner.

[@Sapieteuthid]

It only took me just over twice as long as Mark today.... I'm improving

[@yichen6313]

Fun and not too difficult :D

[@DJDarkDarsi]

the amount of time he left the middle 8/9 in line with the 8 made me angerey D : < but oh well, he has a process...

[@zecatox]

What am I missing at 16:55 about this 567 triple logic ? How at this point can we say that this last cell can't be a 5 ? if this 567 is a 5, then 56 is a 6 and 57 is a 7

[@zecatox]

Oh, never mind, got it : 5 can't be there not because it's a triple but because of where it's placed on the thermometer. The way Mark expressed it was a bit misleading, I'd say ^__^

[@Dashuzz]

4:02 R4C5 cant be 4 - its ok, but why then R4C4 cant be 5???

[@Da-mD]

It's his mistake, I believe he wanted to do that to R4C6, but R4C4 was from the beginning the only place for 4 in box 5

[@cookiehunter3294]

I just wanted to mark all possible ways in this sudoku. Just to see if there's some kind of pattern. Very strange which pattern it showed.

[@balkthor]

Incomplete instructions imo. When the rules state that the path is made up of orthogonally adjacent odd digits that ends in a corner, seems to me it's clearly implied that the corner must also be odd inclusive, as it is part of the path. Right off the bat that breaks it because it automatically places 6 odd digits in a row to complete the path. Should say something like "until it reaches a corner", not "ending in a corner".

[@MyriamTT]

Its a little annoying when I can place a digit ahead of him. LOL

[@bertbergers9171]

20:54 needs a 567 triple to get a 4 which was hanging there by sudoku from minute 2 or something. You make things much too difficult for yourself some days Mark, are you doing that on purpose?

[@KL005]

Mark's off his form today

[@ericveneto1593]

Go make that citizen's arrest Mark! (Is that athing in the U.K.?)

[@alvaropallete]

26:48 here. Simple logic but it isn't straight forward.