The Miracle Sudoku Cave
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- čas přidán 28. 06. 2024
- ** OUR DECEMBER COMPETITION & SIMON'S BONUS SOLVES **
100 4x4 Snackdoku pack from the Skunkworks was released on 1 December as our monthly reward.
Simon's solve of Broken Secrets by TotallyNormalCat was also released yesterday. You can try that puzzle here: sudokupad.app/jMg44R2tpb
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** TODAY'S PUZZLE **
Not the busiest grid tonight from Dorlir and his latest sudoku: Parity Cave! It really is astonishing that this solves uniquely with a single given 3 and a couple of red lines and yet...
Play the puzzle at the following link:
sudokupad.app/701zcuaz8b
Rules:
Normal sudoku rules apply. Shade some cells such that all shaded cells are orthogonally connected, and all unshaded cells are orthogonally connected (a 2x2 area MAY be fully shaded or unshaded). For each N, row N and box N both have exactly N shaded cells, which contain exactly the digits from 1 to N. Adjacent cells on the red line have different parities i.e. one digit is odd and the other digit is even.
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** NEW GAS PACK: VOLUME 2 IS OUT **
The new GAS (Genuinely Approachable Sudoku) pack is out on all platforms here:
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▶ Contents Of This Video ◀
0:00 Theme music & puzzle Intro
1:10 PhD Analysis On Logic Masters!!
3:42 Chants of Sennaar
4:02 Kickstarter news: Phistomefel
4:15 Patreon Bonuses
4:56 Happy Birthdays & 45th Anniversary
7:12 Rules
10:17 Start of Solve: Let's Get Cracking
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We also post the Wordle In A Minute videos on TikTok. - Zábava
This was very unexpected feature, can't believe it was featured this fast considering is not been 24 hour that was published on LMD, really nice surprise and enjoyed the video a lot. Glad you enjoyed it too. Thank you again and take care.
Just again from you outstanding and wonderful!! Amazed at continously how you can create such puzzles.
Thank you so much for this! Tons of respect to you!
Ignoring the 7 in Box nine blatantly *staring* at the 5/7 pair in Box seven is such a Simon thing to do :D
His whole method of haphazardly removing pencil marks once he had completed the "thermo" in c9 was so frustrating.
Anyone else would go down, line by line, cleaning the pencil marks down the grid. Not Simon.
Proceeds to remove one of the two 8s in row 8, one of the two 7s in row 7, (pause), one of the two 2s in row 2, (long distraction), removes the other 2, removes *both* 3s in row 3 (great!), removes a 9 from r7c7 (good), removes a 3 from r7c3 while ignoring 7 looking at the same cell (oh dear)...
Admits at this point, this is why he doesn't like pencil marking so extensively. "I'm just rubbish at it". Yep. We can tell. 🙂
At least he finished off by tidying up box 5 efficiently.
“That’s not nine…. And….” Say it. Say it Simon! It’s NOT a 7 either because of our old friend sudoku. How dare you require me to do sudoku on a sudoku puzzle. SAY IT!!!
Also the 5 in box 4 staring at the pencil mark in box 5
This puzzle is a perfect example of Dorlir’s outside the box thinking, and unstoppable urge to create minimal looking grids with lots of juicy hidden logic inside. It amazes me how he keeps being successful in this endeavour, and this gem has to be one of his best and most surprising creations / discoveries yet. My favourite part was realising that the shaded cells in box 2 could only escape via box 1. Fantastic solve from Simon too, who grasped the logic almost immediately.
I dont know why but this channel got me back into Sudoku...im no where near any good, but I enjoy Thermos and Killer and whispers.
I'm not a fan of killers but I love some of the wackier variants.
whisper?
@@failurenotsorry6600 whisper lines (Dutch whispers and German Whispers)
Thank you very much for the birthday wishes, Simon. You’ll be pleased to know that I did indeed get an extremely decadent slice of chocolate mousse cake bombe at lunch today. Then a friend gave me a heads up about my feature so I had to watch Mark’s video first today. Thank you again for making this a very special birthday!
All the green numbers make the stalactites.
The grey numbers form the stalagmites.
Of the logic we rave
In this parity cave
Just watch out for the bat guano. All right?
(Leaves a plate of batarang-shaped cookies and flies off)
Well! What a bonus day, with a given digit! Lucky us!
I tried it, but I drew the entire shading first, looking for a way it could work, then started doing sudoku all over the place, did find row 9's thermometer that way, but was forced to put a digit on the parity line where it did not belong. When I undid the whole thing, I could see several places where I could still obtain the same total shaded cells in different places, but I couldn't quite figure out how to be certain.
So I watched Simon do it instead, at least some of my skyscrapers were in somewhat the right place. Now I get to watch Simon again doing all kinds of otherworldly things in Chants of Sennaar.
Another reason I enjoy CtC content is the vocabulary. I've heard the word otiose before, but never looked it up before.
If the purpose of speaking is to communicate, then you're better off saying "useless" or "pointless" instead.
@@Hakucho64if the *only* purpose were to communicate ideas then, yes, arguably, we should use the commonest synonyms. But there's more to language than that; we can also communicate our *attitudes* to those ideas, or subtle differences in connotation. My favourite example is the difference between "wolfish" and "lupine". The literally mean the same thing, but they convey different feelings.
Simon, please don't change,. Your rich word- horde is neither otiose nor nugatory!
@@AlecBrady Quite. I'd rather be described as childlike than childish.
@@emdiar6588 👌
Fascinating puzzle! At first I misread the rules to say that the rule applied to row, box, *and column* N, and after a minute ran into a contradiction in box 7. Fortunately, I ran into the issue quickly. It would have been awful if I had gotten 20 minutes into the puzzle before discovering my mistake.
After starting the puzzle over (and keeping previous time), my time was 39:11, solver number 651.
Havent watched this yet but just wanted to comment about how I'm absolutely loving the snackdoku challenge! Its so satisfying to have those little moments of figuring out the logic, and no puzzles feel repetitive either. It will hopefully be the first puzzle hunt I complete! Thank you for it!
@LorisLaboratory you have encouraged me to give this one a try! I ❤to watch Simon and Mark confront the fantastic puzzle setters, but have very little confidence in solving them myself!
@longwaytotipperary I always have confidence in you my friend. Have to believe in yourself 💜🩵
@@davidrattner9 thank you David!! ❤️❤️
I just began the Snacks today and they are incredible!
A trick I noticed: You have a pencil-marked 5 in R4C5, but that cell can never be a 5. A 5 in row 4 must be unshaded, but as it is also in box 5 it must be shaded. How can a cell be both shaded and unshaded at the same time? It can't.
Yeah I noticed that early and was trying to see if it would apply elsewhere, but it ended up not being a very generalizable trick. There are very few digits where this thought process could be useful.
This was my favourite bit of the puzzle. As Sidnv noted, I hoped it would help in more places, too. Other than limiting the 8 in the bottom 3 boxes, it didn't.
Schrodinger shading😂
@@janerobson2297 That would be neat. :-)
i had a brilliant deduction that simon missed. sadly it doesn't help the solve, but thought it was really beautiful. at 22:35, we get that the 5 is in 2 cells in box 5. the digit 5 in box 5 needs to be shaded, but in row 4 the 5 needs to be unshaded, so r4c5 can't be 5 or it would need to be both shaded and unshaded to satisfy the row and box requirements. that places the 5 in r6c5 and is shaded
43:30. That 5 was available for a hot minute. It’s always funny when I stress over a missed pencil mark and as he works around the grid he does it from somewhere else.
10 complicated deductions to sidestep a simple pencilmarked sudoku step
Somewhere around 25 minutes in, you made an assumption that the 12 domino in box 2 was on the left, when it could possibly have been in the middle and connected to a 5. I skipped to the end to see whether you were right and you never checked. I had assumed the middle and made several deductions before you did that, so I was quite taken aback.
Edit: I feel so stupid now. I just realized there can't be a shaded 5 in row 4.
It really is as fascinating as the other 'miracle' puzzles, but I have to say this one also felt tractable the whole way through. Definitely having watched the channel for a while and knowing the border and checker board tricks from prior solves Simon has done was a huge factor in that, but it did feel the whole way that as long as you knew those tricks, it was always going to be possible to find a next step and there were always threads to follow. It always felt like it would definitely be possible to see a next step if you scouted around enough.
I really enjoyed solving this puzzle. Took me quite a bit longer than it did Simon.
26:36 for me. But i had to watch the video, for Simon to translate the rules to human to understand them.
Exactly!! 😄
Simon, you forgot to check the result at the end. This has been happening more and more often lately.
I like how the thermometer serves as a reminder of which numbers can be shaded in that row haha
I just had to watch this video because it seemed so amazing that the rules could work - and I do like parity puzzles (which the red lines made this kind of in that category). I really enjoyed the video, Simon, and your solve. Tonight's vocabulary that I just love but can't ever seem to work into conversation: otiose. What a word!
That's quite a brilliant puzzle and unlike anything I think we've seen before on the channel. Well done.
The Logic Masters Germany paper is fascinating! Where can we read the whole thing? Would love to go over the stats!
Perhaps he'll see your comment
I tried looking for it on Google scholar and Google, but had no luck. What makes it hard to find is that we don't know the spelling of Brian's last name or the name of the paper or at least the university he's at. But I only spend like 5 to 10 min on it.
Hopefully somebody else finds it, would love to check it out.
One of the most beautiful puzzles I have seen on this channel😮
Great puzzle. The beginning was quite complicated and I hat to wach Simon for a while, before I understood the rules completely. Then I enjoyed solving the puzzle with great pleasure.
I got this one! 01:32:36 was my time!
Definitely stumbled over a few things, and some of my basic Sudoku and "this cell is unshaded and thus can't be 3" got me and took a while to find.
Nice one :)
29:23 for me. Once I got started, it fell pretty quickly. Creative ruleset that resulted in some very nice logic.
Here's a thought about your software (and kudos to your programmer(s)) - it has a letter tool, so for similar cases when you cannot shade odd and even digits it has letters "E" and "O" - I've just checked, it does. =)
First time I beat Simon since starting these (cloking in at 28 minutes), and doing 'em religiously around a month ago! Kind of stoked, since I usually require 2-5x the time to solve them xD
After so long , a 1 to 9 column in a sudoku!
21:16 for me. Nice puzzle!!
Posted 6 minutes ago, the fastest I've ever been here! Thank you rare day off work lol
Solved in 84:24, it was neither fast nor pretty and I had watched enough of the video to be reminded about checkerboards (but I remembered the thing about changing colours around the perimeter myself). Everything else was just getting to grips with how the row & box restrictions interacted until I got a digit on the red line, then I did an absolute ton of pencil marking 😅 I don't know if this was a 'hard' puzzle or just a case of looking in the right place for each logical step, but it's probably one of the most complicated solves I've managed to complete and I'm extremely proud of getting it done.
🎉🎉🎉
Beautiful idea!
51:35. I had a ball battling with this one.
Thanks for this, I got very engrossed in it and stayed up past my bedtime to finish it off as I couldn't tear myself away.
Simply lovely!
Finished in 39:27. I'm not that good with orthogonally connected regions, particularly of the non-2x2 variety, but I think overall, I was able to muddle through enough to solve this in decent time.
Interesting logic employed in the puzzle!
34:23 "Otiose"? I'm perpetually amazed by the vocabulary I pick up on this channel…
I enjoyed this one and solved it in about 50 minutes, but felt like a lot of the time I was stumbling my way through ... it didn't help that I immediately forgot about Row N having the rules apply to it as well as Box N for a while so didn't really have a clear handle on the logic because I was considering possibilities that weren't allowed.
I guess 46:58 is not too bad. Once you really start mixing numbers and shading, it goes really fast. Only had the one slip, which cost me around five minutes to undo, so happy to be close to Simon's time.
I started it, worked out some of the shading, but got stuck. I forgot about the Yin-Yang rules around the perimeter. Good solve Simon.
I ❤ magic puzzles!!!
77:39 with a few peaks at the video. I completely forgot to think about the rows and then I forgot that the rows had to have the digits 1 through N.
50:34 - I love a puzzle with shading :) Took me far too long to realise things about column one...
I waited _so_ long for Simon to shade the 68 in box 5 because I wanted him to handle the resulting checkerboard. Finally, he shaded it, but... then he ignored the checkerboard, and my mental pain continued. :)
And we got the rare no-solution-check variant!
yay more Chants of Sennar tomorrow, be there or be square, cause you aren't a round.
Didn’t realise the checker pattern held, made it a bit difficult but a beautiful solve nonetheless!
Rules start at 7:13
Let's Get Cracking at 10:24
Cracking the cryptic keeping me sane for years. Thank you.
Ps You need a new level - " utter utter Bastard! " With compliments to the Young ones.
Found this one a little challenging to break into but a fun solve. Finished in just under an hour (55:58)
Brilliant puzzle - but how many people were screaming at increasing volume "no checkerboard!!" from when it didn't seem to do much beyond when it was really helpful.
Interesting constraint. Took me about two hours to get though it but I feel like I was a bit slow on the uptake of a few things not being that good at yin-yang style puzzles.
31:47 for me. i thought i was gonna dislike it for the such weird rules, but at last i did good.
"This 68 can't be shaded, but let's not mark it, because that might be confusing."
Took me 70 minutes and it was definitely worth it.
Look like Simon was constructing something, in the end was buildings!
Everytime you got a incorrect number you say "aah" and it sounds like a bird, today at 48:05 was a crow I guess 🤷♀️. I don't know! Hehe, but the solve was very enjoyable to watch.🤗
I noticed a thing! 27:27 R4c5 can't be 5. It would have tolbe shaded for being in box 5,but unshaven as well for being in row 4. At the time of typing, don't know if/when he will notice.
Okay, he can remove 5 from col 1's logic, but he's really messy with his Sudoku and pencil mark cleanup today.
Christ. I spent way too long (well over an hour) trying to figure out how box 2 escaped, eventually by basically brute force realizing the shaded 5 in box 5 had to be on the bottom, thus preventing a 1-2-5 vertically in the middle from box 2 to box 5. Never even dawned on me that 5 couldn't be shaded in row 4. Amazing how missing one little thing can make a puzzle so much harder.
45:57 for me. Brilliant puzzle!
R4C5 was driving me nuts all video :D By checkerboard, it had to be unshaded, meaning it wasn't a 1. Not a critical deduction, but one of the only ones I made.
There is a really strange deduction you can make with this ruleset. R4C5 is never a 5, because 5 in row four is unshaded, but 5 in box five is shaded, so it would have to be shaded and not shaded at the same time.
Who knows how to start Petition?
I want another podcast episode. How are you guys? I want more about meeting the fans. How are the kids getting on playing second fiddle to half a million buffoons who don't know how to arrange the numbers 1-9?
Do it in the same space over a glass of port.
I don't think you can assume the c9 thermometer. Consider a 1 in r2c3 and r3c4 with a 2 in r2c4. This leads to the 2 and 3 being reverse in c9. Similar can be done with 8,9 in boxes 7/8.
You can’t put a shaded three in row 2
I was thinking the same, but that's surely why the rule for row N is included
Have you guys run out of GAS?
Good morning from Aotearoa!! Have you seen the protests David? Went to a couple up here in Hamilton this morning
These miracle puzzles are outstanding, it looks like witchcraft that they yield a unique solution
I wonder if this makes a beautiful pattern on my wall.
Ropes can be straight or interlaced. Braids weave.
The strands that make up a rope twist.
You just need to imagine you're looking at one side of a three dimensional rope. The strands disappear off the left (column1), go round behind, and re-emerge on the right (column 3).
@@RichSmith77 ahh, so that's why it's called roping!
25:20 - Couldn't we use the middle column to go down? 1, 2, 5, and then move sideways to get out of box 5.
The 5 in row 4 is unshaded.
@@Bautos42 ahh right, I was only thinking of the box constraint, not row.
I do think with similar logic the 5 could’ve been placed in box 5 much earlier though - the 5 in box 5 had to be shaded but the 5 in row 4 couldn’t be and since the 5 in box 5 could only be in row 4 or 6, it had to be placed in row 6.
r4c5 chequer mark?
Are there any videos of Simon just absolutely demolishing some "normal" sudokus? I feel like I'd love to watch a 30 or 60 minute video of him seeing how many he could solve LOL
I think that if you go back to the early videos on the channel there are
Rules: 07:21
Let's Get Cracking: 10:25
What about this video's Top Tier Simarkisms?!
The Secret: 2x (04:20, 06:04)
Three In the Corner: 1x (48:16)
And how about this video's Simarkisms?!
Ah: 20x (14:24, 19:41, 20:26, 23:20, 23:20, 24:44, 24:44, 30:50, 34:07, 37:45, 38:18, 39:01, 39:05, 42:37, 43:01, 45:14, 45:31, 46:04, 48:04, 48:29)
Sorry: 14x (14:28, 15:32, 17:06, 19:00, 27:16, 27:51, 28:40, 31:20, 32:55, 33:14, 33:14, 33:14, 33:41, 48:55)
Hang On: 12x (15:03, 15:03, 16:46, 21:07, 21:18, 22:50, 26:25, 26:49, 34:56, 40:38, 44:20)
Checkerboard: 9x (11:20, 11:39, 12:33, 12:55, 13:11, 45:34, 45:36, 45:40, 49:44)
By Sudoku: 6x (19:55, 28:49, 37:27, 38:14, 43:06, 46:39)
Pencil Mark/mark: 6x (20:07, 22:18, 39:07, 39:44, 40:03, 40:20)
In Fact: 5x (13:57, 15:36, 17:22, 32:18, 32:18)
Weird: 5x (05:30, 09:54, 09:59, 20:42, 20:42)
Cake!: 4x (05:23, 06:08, 06:45, 07:10)
Lovely: 3x (02:59, 04:50, 48:32)
Bizarre: 3x (18:00, 49:21, 49:23)
What Does This Mean?: 3x (40:55, 42:16, 44:20)
Goodness: 2x (32:55, 36:49)
Naked Single: 2x (39:50, 40:08)
Stuck: 2x (35:20, 49:57)
Beautiful: 2x (21:04, 35:28)
Gorgeous: 2x (04:45, 24:44)
Bonkers: 2x (00:55, 00:55)
Whoopsie: 2x (38:51, 38:59)
Symmetry: 2x (15:42, 50:01)
Bother: 1x (47:38)
The Answer is: 1x (12:51)
Naughty: 1x (35:05)
Brilliant: 1x (50:28)
Incredible: 1x (01:11)
Extraordinary: 1x (21:18)
Shouting: 1x (06:18)
Obviously: 1x (12:05)
Intriguing: 1x (06:47)
Wow: 1x (44:48)
Unique: 1x (49:26)
Most popular number(>9), digit and colour this video:
Sixty Eight (4 mentions)
One (89 mentions)
Green (32 mentions)
Antithesis Battles:
Low (3) - High (2)
Even (13) - Odd (10)
Shaded (99) - Unshaded (41)
Lower (2) - Higher (1)
Highest (3) - Lowest (0)
Row (74) - Column (9)
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!
I wonder if it’s called parity cave because the shading looks kind of like stalagmites in caves after the puzzle is finished
No, it's because the rules are very similar to a type of pencil puzzle called cave puzzles.
@@Hakucho64 ohhhhh alright, thanks :)
At the beginning - it never said the digits had to be in order. Did Simon committ the unpardonable sin of guessing? At box 3 for example he figured out where the 3 shaded cells were. But how did he know 1 to 3 went in order top to bottom? Ok so looking at the rules I can see 1 had to be at the top but couldn't it go 1-3-2 instead? Am I missing something?
Simon is right as always he just didn't explain it. After studying it I figured it out.
Interesting. This video's title card is still the old one, that makes the outdated claim that Mark is the current reigning Times Crossword Champion. Mark used a different title card in his video yesterday. Is this an older, pre-recorded video, perhaps?
No it's just Mark was still fiddling with the music! Once I get the final version I will adjust :)
@@CrackingTheCrypticA few commentators on Mark's video were saying they actually preferred the music on that, over the regular intro music.
(Can't say as I'm particularly bothered one way or the other, though. 🙂)
you're amazing
Hey guys, so how did he get rid of the 57 pair in column 1?
When was there a 57 pair in column 1?
He fills column 1 pretty much from 34:30 onwards, using a similar argument to how he filled column 9 earlier.
Please explain. I don't see that there ever was a 57 pair in column 1.
There's a 57 pair in box 1, column 2. Is that what you mean? That gets sorted by 789 being placed in box 3 at 47:05.
Level 11 Puzzle
Why does 3 need to be shaded at the start
Because in row 7 the digits 1-7 need to be shaded. Also in box 8 the digits 1-8 need to be shaded. So the only digit in box 8 that's unshaded is the 9.
34 minutes
26:26 for me and solver #4570.
Simon's biggest mistake ever! Used leafy green to mark unshaded areas with sunny yellow just waiting to be used! Blasphemy!
the wording of the rules is a bit misslieading
How so?
@@RichSmith77 as in I read the second sentence wrong and got confused.
I thought it said shaded cells in rows and boxes had to be connected.
my bad
Is GAS no longer a thing?
Just a bit shy of 100 min. This one wasn't nice to me.
@ 14:56 - "there is a 1 that is shaded, and everything else is unshaded" - Your musings that follow are ridiculous. There is exactly one shaded cell in R1. You've just gone through at length how there can only be one or two runs of colour around the perimeter. Since there is only one shaded cell in R1, there are two colours in the perimeter. Given that R1C1 would be an isolated cell if it were shaded, R1C9 must be the shaded cell or you'd break the rule. All you're cell-by-cell logic extensions are just daft, since you can't have more than one shaded cell in the row.
@ 30:09 - "I don't think I'm thinking about this clearly" - You're asking the wrong questions. Where does the unshaded 9 go in box 8? It must be in R7. If it were in R8, it would have to connect sideways, but there's already an 8 in the row. In box 7 you need unshaded 8 and 9. The diagonal is shaded, so the cells below the diagonal must be shaded or they can't get out. The 8 and 9 in box 7 must be vertically to connect, so they must be on the perimeter, which makes the rest of the perimeter unshaded. You know which is 8 and which is 9. You now have a resolved 15 pair on the diagonals in R7. The 9 in box 8 must connect to an 8 above it, making R4C4=6 and R4C6=2 (shaded). In C1, similar logic to the shaded cells in C9 applies, putting 1 in R9, and 2-9 in order vertically.
@ 43:58 - Having just claimed you can put 12 into R5C7/8. Actually you can't. If you do that, the 9 in the box must connect sideways to 8 in box 5, which connects vertically to 9 in box 8. This then has to connect to 7 in R5C6, 9 in the centre and now you have no more high digits to connect with, and you need at least one more. In addition, you'd have a stranded 12 pair in the box.
You didn't need to use yin yang trickery; during my own solve, there was never a checkerboard possibility.
Simon, what is the incessant banging/drumming sound in all of your videos? Please ask Ruprecht to stop banging on his pots! ;)
Simon is only interesting 10 minutes after he arrives at parties
Yay - 1:59:27 - What a fantastic puzzle that was. At first glimpse you couldn’t see how it could possibly disambiguate but the logic was fantastic. Definitely one of my favourites. Thanks @dorlirahmeti7576