The Worst Puzzle I've Ever Been Sent

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** TODAY'S PUZZLE **
According to its rating on Logic Masters, today's sudoku (Foggy Knight by Die Hard) is an average puzzle with few exceptional features. The truth could not be more different: in our opinion this is one of the most incredible sudoku discoveries ever. The ruleset is incredible and it's a fog of war puzzle with nothing showing. Prepare to have your mind blown!
Play the puzzle at the link below:
app.crackingthecryptic.com/su...
Rules:
Normal sudoku rules apply. The grid is covered by fog and correctly placing digits may reveal additional digits. Each digit satisfies only one of the following conditions: a) It is exactly one chess knight's move away from at least one cell containing the same digit; b) It is in its own 3x3 box (3x3 boxes are arranged in normal reading order. So eg 9 in box 9 meets this condition). c) It is the digit 5. There is one exception: the digit in the very centre of the grid satisfies exactly two conditions. No guessing is required or allowed.
** NEW SUDOKU HUNT JUST OUT **
Join us on Patreon (for as little as $2) for a brand new sudoku hunt (called Lines & Shapes) - it was released on 1 Septmber. Closing date 20th September :)
/ crackingthecryptic
** NEW GAS PACK: VOLUME 2 IS OUT **
The new GAS (Genuinely Approachable Sudoku) pack is out on all platforms here:
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60 original puzzles by Clover, Bill Murphy and Philip Newman!! Earn party hats and dinosaurs with these brand new puzzles!
▶ SUDOKU PAD - Use Our Software For Your Puzzles ◀
You can input classic sudoku puzzles into our software and help support Sven, the programmer responsible for the wonderful user interface we all use to play these puzzles everyday. The app also comes with 12 handmade puzzles from us:
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Android:
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ALSO on Amazon: Search for “SudokuPad”
▶ Contents Of This Video ◀
0:00 Theme music & introduction
1:13 Puzzle reveal & Rules
5:34 Join Us On Patreon
6:13 Happy Birthdays
7:56 Start Of Solve - Let's Get Cracking!
▶ Contact Us ◀
Twitter: @Cracking The Cryptic
email: crackingthecryptic@gmail.com
Our PO Box address:
Simon Anthony & Mark Goodliffe
Box 102
56 Gloucester Road
London
SW7 4UB
(Please note to use our real names rather than 'Cracking The Cryptic'.)
▶ SUDOKU PAD - Use Our Software For Your Puzzles ◀
You can input classic sudoku puzzles into our software and help support Sven, the programmer responsible for the wonderful user interface we all use to play these puzzles everyday. The app also comes with 12 handmade puzzles from us:
iOS:
apps.apple.com/us/app/svens-s...
Steam: store.steampowered.com/app/17...
Android:
play.google.com/store/apps/de...
ALSO on Amazon: Search for “SudokuPad”
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31 май 2024

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Комментарии : 552

@DieHard111 8 месяцев назад

Die Hard Here. Thank you for the feature and the praise! I am so glad you solved this puzzle - I got as much enjoyment from your solve as I did from setting it. This puzzle was derived from another puzzle (Knight Shift), which you can find on LMD (a warning: this one is even more difficult) - but I had the idea that the concept would work even better as a fog-of-war puzzle. When I set the naked single 9, I knew I had to complete it!

@longwaytotipperary 8 месяцев назад

What a fantastic rule set!!!

@Paolo_De_Leva 8 месяцев назад

I can't imagine a more impressive and peculiar combination of such an original and masterfully described ruleset with such a cool, smart and magnificent construction. 👏👏👏👏👏👏👏👏

@JaymanOttawa 8 месяцев назад

That was one of the coolest puzzles of all time! Bravo sir! :)

@David_K_Booth 8 месяцев назад

I like the humour. You casually threw us the first digit like a dog biscuit, and we happily caught it, but then we found out we had to earn our supper. Lovely work.

@kindlin 8 месяцев назад

@@David_K_Booth It was like an intro to the otherwise new and complex ruleset. By understanding the middle cell and the 2 rules, you get a small intuition for how the other rules interact on all the other cells.

@charliec.6285 9 месяцев назад

My theory on poor ratings on Logic Masters Germany vis-a-vis Fog of War puzzles: Unlike other types, FOW puzzles can be brute-forced by trying digits until you see fog revealed. I've noticed that difficult fog puzzles on LMD are often "solved" by people who don't usually complete non-fog puzzles of comparable difficulty. If there are people who only complete a puzzle because of trial and error, I imagine they might be more inclined to give it a lower rating.

@Robert_H. 9 месяцев назад

Sounds like they need an error score that shows how many wrong numbers a person typed in. I can't imagine who would end up going to the trouble of retyping the solution of the soduko with another account just to make a bad rating displayable.

@Tahgtahv 8 месяцев назад

@@Robert_H.The problem is LMD doesn't have a Player, all you do is type in whatever digits are requested. For FOW puzzles, by the time you go to entering something on LMD you don't need to guess at the answer.

@SilvrSavior 8 месяцев назад

Maybe a counter that is added to every time an incorrect digit is entered that can clear fog. The software is smart enough to check if fog is present then it clears it with a correct entry, then it should be capable of checking & tallying up all the incorrect entries.

@charliec.6285 8 месяцев назад

The website doesn’t interact with any software. To mark a puzzle as complete you must enter a code chosen by the setter (usually the digits in a row and column that aren’t filled until the end of the solve).

@_aullik 8 месяцев назад

The start of the puzzle is super easy and fog puzzles usually lead you on an understandable solve path. I got the 5 in the middle easily, then i made a mistake ruling out the 5s in the corner and placed the 1379 and about half a minute later i noticed my mistake but by then it was too late. I had a lot of fun watching Simon solve the puzzle, but it was definitely to hard for me and i should not have tried it.

@PauxloE 9 месяцев назад

This was the fastest first digit I ever found, but then I got stuck.

@pelahnar4 9 месяцев назад

Myvdad was reading a book about logic puzzles yesterday and asked if I'd heard of "Simon Anthony" who was quoted in the book and described as "making some youtube videos on sudoku" I completely blanked without reference to Cracking the Cryptic and said no, until it slowly dawned on me, the yes, I _do_ watch someone named Simon and...wait, yes his last name _is_ Anthony...

@tarquinioprisco8459 7 месяцев назад

39:54 "2 is not 5, unless you turn it upside down" 😂

@DieHard111 8 месяцев назад

Die Hard Again. Thank you everyone for your all comments. And a special thanks to Simon for his incredible enthusiasm which is highly infectious. A few points of note: 1) Yes, it is possible to deduce that the corners are not 5s as a first step (this leads to a contradiction). But this does not take you very far, and I'm glad Simon found the naked single 9 first - which is exactly as intended. 2) Yes, it is also possible to deduce that R3C7 is a given 7. This takes a bit of look ahead (bordering on bifurcation), but it is a valid (if unintended) opening. Again, I don't think this takes you too far. A number of people have noted this won't clear the fog around the given digit - that is a feature of SudokuPad to signal its valid, but not the intended step. 3) I recognise not everyone loves this puzzle. That's OK. Simon's reaction made my year!

@michaelawilliams 8 месяцев назад

I love it!

@grithog5399 8 месяцев назад

I really wish the rules had indicated that the fog won't clear if the digit is a hidden given. It really set me back a bit since I assumed I must have made an error. Right, the 7 doesn't take you too far, but it can set you back quite a bit if you assume you made an error. Having the fog not clear seems more like unfair than it does "feature," especially since there is no indication that the "feature" has meaning. A great puzzle otherwise. A rules clarification would have tidied it right up.

@Freeeez3 8 месяцев назад

@@grithog5399 very likely that die hard didn't know either, since this is technically a bug in the software.

@v0id_d3m0n 8 месяцев назад

@@grithog5399 it does say "*may* clear the fog" rather than "*will* clear the fog" which could be an obscure indication of this

@grithog5399 8 месяцев назад

@@Freeeez3 But he’s saying it’s a feature, right?

@bobstreet2491 9 месяцев назад

I was surprised at how long you made us wait before mentioning digits "mutually satisfying each other".

@TiagoMorbusSa 8 месяцев назад

That was pleasing.

@Umbra451 8 месяцев назад

This is the orthogonal snake touching all over again

@bbgun061 8 месяцев назад

Those digits are VERY good friends!

@sirgeremiah 8 месяцев назад

@@Umbra451 Absolutely. Simon seems so tame, then does this so blatantly.

@brookepearson 8 месяцев назад

@@bbgun061 all I can think of is "and they were roommates" lmao

@Schmogel92 8 месяцев назад

Interesting. If you copy the grid, rotate it around the center 180 degrees and add up overlapping cells you get 10 everywhere.

@LithmusEarth 8 месяцев назад

Bro. That's so Wild.

@athomasone 8 месяцев назад

Is there some kinda phistomafelesque thing that caused this? Or just some byproduct of the knights move constraint? Or Die Hard just made it that way?

@melaniehall5885 8 месяцев назад

@@athomasone I don't have the answer, but I'd guess it either has to do with some knights move black magic, OR the puzzle constructor figured out that it easily works that way, and did it because it was easiest to set. I'm leaning more towards the first one. Knights move can lead to weird logic shenanigans

@simsplayer9952 8 месяцев назад

One other thing I saw is every # including the 5 has 2 boxes with the # in same postions.

@jonotick 8 месяцев назад

Part of it is definitely a flow on from the fact the numbers obeying the box rule would add to 10 with their rotated pair

@lunaverse4977 8 месяцев назад

I've been watching this channel for a few weeks, despite not having played sudoku myself since I was about 12, and for some reason i decided that THIS was gonna be the puzzle i tried for myself instead of just watching you do it. I must reiterate: have not done this since i was 12, and am now an adult. It's definitely NOT a beginner friendly puzzle, and i don't know what posessed me to choose it, but i did it. Took me 4 hours, but i did it.

@tessabrisac7423 8 месяцев назад

Wow, congrats!

@lunaverse4977 8 месяцев назад

@@tessabrisac7423 the satisfaction was definitely worth delaying my dinner until 10 pm, although i don't think i should make a habit of trying to solve puzzles right before cooking.

@mostman 8 месяцев назад

Nice!

@sirgeremiah 8 месяцев назад

I've been a regular sudokuist off and on for years, but never anything other than standard sudoku, and never the really hard ones. I watched two of Simon's videos and lept head-first into these bizarre variant rulesets. I'm still not very good at them (especially when they are used backwards, as with the knight's move here), but I love it, anyway.

@OsnofAhcor 8 месяцев назад

that was brave

@cerebralcomics 8 месяцев назад

Pretty cool how each individual digit is not only in its 3x3 box, but also in its cell. Amazing setting.

@cryptikkcries 6 месяцев назад

OH YOU'RE RIGHT!!!!

@mranderson978 6 месяцев назад

Actually the rules of the puzzle make this the only possibility, so Simon could have filled in those digits from the very outset. The knights move rule excludes them from being in any other spot.

@challicerobinson6273 2 месяца назад

@@mranderson978 That is what I thought too but was starting to wonder when Simon didn't get it. Only started to solve it myself when yelling at six months ago Simon through the screen didn't give him a hint...

@bobblebardsley 9 месяцев назад

29:26 "And this is going to be lovely, because it's going to allow us to sing 'Ah, You Rotten Thing'." All together now...! Ah, you rotten thing! How dare you give me naught? How dare a digit bring less logic than it ought? I went the long way round to prove what you must be, and yet you, rotten thing, gave nothing back to me. Bobbins, bother, blast! I loudly vent my wrath while moving not-so-fast along my logic path. Now digit, can you tell how grumpily I sing? You scoundrel of a cell; You rotten, rotten thing.

@S_Black 9 месяцев назад

The break-in can also be argued by the 5 alone (and not some other digit). 5 automatically obeys rule C, but normally each digit can only obey one rule. Not two. So 5 in box 5 breaks that. The only way around is that is using the exception for the center digit.

@thezanycat 8 месяцев назад

I’d argue the 5 isn’t the break in at all, rather Simon’s second placed digit is the true break in

@0LoneTech 8 месяцев назад

@@thezanycatBeing a bit stuck right there, I agree.

@bananaman2 8 месяцев назад

I loved the symmetry of this puzzle and noticed early on how the positions of paired digits (1+9, 2+8, 3+7, and 4+6) swap places when rotated around the grid. I imagine that must be a consequence somehow of the knight's position requirements but I can't begin to plumb the depths of that logic.

@Valkhiya 8 месяцев назад

So this is really funny, I actually found a bug (?) in the fog logic. In a board position very similar to 34:16 in the video, I deduced that r3c7 had to be a 7 (the 7 in box 4 helped me reach that conclusion), so I wrote down the digit, but because it's a given digit it actually just revealed that single cell and not lifted the fog around it.

@dannyzwolf4546 8 месяцев назад

I think that works as intended, but you did stumble on an unintended solve path.

@tenientebustillos4019 8 месяцев назад

This happened to me as well. It was not an actual guess but a deduction. Had to check the video to verify my input was correct.

@deadeaded 9 месяцев назад

Reading the comments on LMD, it seems like the low score was because there was a technical issue with the software, which our lord and saviour Sven promptly fixed, as usual. Thanks, Sven!

@RichSmith77 8 месяцев назад

Isn't there still an issue? I managed to deduce r3c7 was a 7 early on, by basically testing all permutations for placing 7s in the grid (after the initial 5 on the centre). I couldn't understand why it wasn't clearing the fog. I assumed my deduction was wrong, so I spent half an hour going over the same logic again and again, getting the same result. I eventually discovered it *was* a 7, my deduction was correct all along, it just didn't clear the fog as I expected because there was also a hidden given digit in that cell! (I'd coloured the cell, so it wasn't noticeable to me that the fog was cleared in the one cell. I just saw it wasn't cleared from the surrounding 8 cells.) I can well understand the low rating, even though it's more a software issue than a puzzle issue.

@JK7H 8 месяцев назад

@@RichSmith77 the cells with given digits are not meant to be brute forced, therefore the fog doesn't behave the same way.

@RichSmith77 8 месяцев назад

@@JK7H You think it's a deliberate decision that the fog behaves this way, to punish me for not being smart enough to work out the logical path that Simon and others smarter than me could? I could forgive a simple software bug, but if I thought this was a deliberate intention, to make me waste half an hour looking for an error that wasn't an error, I'd downvote the puzzle no end. My way was "logical". It just involved a lot of case checking, very methodically. r3c7 had to be the 7 in box 3.

@thesecondderivative8967 8 месяцев назад

@@RichSmith77 To be fair, the instructions said that a correct digit *may* reveal the fog. Not will reveal the fog. It isn't the creator as much as it is you that put yourself in that situation. When the cell cleared but not the fog around the cell, it's pretty logical to assume that that digit is not going to clear the fog so long as you know your logic is correct. You didn't read the instructions properly.

@RichSmith77 8 месяцев назад

@@thesecondderivative8967 Sorry, but I think it's you that didn't read the instructions correctly. It doesn't say it may reveal the *fog*. It says it may reveal *additional digits*. If you have done fog of war puzzles previously, the expectation is that a correctly placed digit will remove the fog in the surrounding cells. The "may reveal" comes about because those revealed cells may contain further given digits, or they may be empty. To be clear, I'm not blaming the puzzle constructor. I'm pointing out a software bug.

@pedrosaraiva1411 8 месяцев назад

Normally fog puzzles are easier for me than any other variants, because normally you have always some numbers or lines already revealed ,so its easy to understand were to start. But this one was absolutely brutal, because you even after put the 5 in the middle square , you really have to work hard to know where to look net.

@AnaFromTheShire 8 месяцев назад

Ahhhhh my happy place, just as I've gotten home from a super hectic day... As someone with high anxiety levels which affect my life in multiple ways, Cracking the Cryptic, Simon in particular, has been an absolute godsend. I can feel the tension leave my body as I watch him go into battle with each puzzle. And on a personal level, his gentle and gentlemanly manner, compassion and wholesomeness are like a hug for my mind after dealing with a wild and sometimes terrifying world. I'm wrapped in warm blankies, got the cats lined up along me, hot choccy in one hand, and a big smile on my face! Thank you so much Simon and CTC, arohanui from New Zealand

@ChasePhillips7 9 месяцев назад

Simon, you are a treasure in ways i can't possibly describe. You and Mark and your partners absolutely have an invite, thank you so so much for saying that about me and Cheryl and Vegas! If you need a physical invite, send me your mailing address and I'll prove it!

@emilywilliams3237 8 месяцев назад

I am so glad that this channel solves these very hard puzzles on a regular basis. I always learn something about how to think logically, and, when I think about it, I realize that it was not all that long ago that a thermo sudoku would have seemed hard to me. So maybe these more complicated puzzles are aspirational for me in the same way that the types I once found difficult are now not all that difficult. Simon, the grid coloring, your reasoning and explanations, and all of your pencil marking all served to make this puzzle make total sense. Am I going to turn around and solve it? Not today. But sometime, maybe ... Oh yes, one more thing that was impressive was that the fog was meaningful in this puzzle, and because it was completely fogged over it did not lead the witness, so to speak, as much as other fog puzzles often do. Thanks so much, Simon. I loved it.

@bobblebardsley 8 месяцев назад

Agreed, and why I don't complain about hour-long videos even on days when I don't have time to watch them in full, I'll always try to watch the break-in and learn from that. I'll usually only attempt the puzzle if the video duration is less than 30 minutes AND I understand the rules, otherwise I'd still be solving it by the time tomorrow's video pops up!

@davidmiller9485 8 месяцев назад

@@bobblebardsley Which is cool and all but I like the longer videos because I get to see Simon solve using various form of logic (form being used sorta loosely here). That's the great thing about recorded video. You get an opportunity to watch the video based on the time constraints that each person may be dealing with.

@brianarsuaga5008 8 месяцев назад

This was too hard for me to do fully alone, but I'm pretty sure this is my favorite puzzle on the channel yet. It's just so elegant, and it really felt like I was.. not so much teasing apart a beautiful knot, but being given a tour of this beautiful knot that someone discovered exists in nature. It was also amazing how many different ways you could apply the mutually-exclusive conditions, when at the start of the puzzle they seem to be saying nothing at all. Truly an achievement, thanks for bringing this to us all

@Sidnv 9 месяцев назад

"Deadly pattern somehow resolving itself": Simon, Die Hard gave you the digit that resolved it :)

@RenameJames 8 месяцев назад

I love watching how excited Simon gets solving these puzzles. I can't help but get excited right along with him. This was a beautiful solve to watch. Simon was very Simon in this video.

@thecalculusofexplanations 8 месяцев назад

I would love them to use some sort of eye tracking software for a solve, I think that would be fascinating.

@awilliams1701 9 месяцев назад

I noticed that each digit had to appear in it's own cell in its own box. when the box positions are numbered the same way.

@steves1371 8 месяцев назад

I did it in 82:25, my first solve of a puzzle from this channel!

@radvermin1541 8 месяцев назад

Was getting frustrated with the extra hard sudokus I was attempting. Found your channel and saw how to think through the harder ones. I can solve them through simple deductive logic rather than guessing. Thank you for your channel. I'm enjoying them again.

@altaybatuhan4560 9 месяцев назад

26 minutes in MY MIND IS BLOWN WHAT IS THIS PUZZLE

@Bonehead777 9 месяцев назад

Someof the ratings on logic masters are just wrong because it depends who has solved them. There are definitely some folk who solve puzzles and just give them terrible ratings. No idea why it means that much to them. I have literally watched updates on a few of my puzzles and noticed big drops in ratings with certain solvers. And I know when I have created something that in no way deserves the lowest marks. I will bet that I am not the only one who has spotted this. Of course, the vast majority of solvers are completely fair so if a puzzle has a lot of solves, it is much more likely to get a fair rating for its’ quality.

@deadeaded 9 месяцев назад

One of my favourite puzzles I've ever set was getting a lot of early solves (which is unusual for me, so I was watching excitedly), but then one solver gave it a zero, dropping it down to an 80-something, and suddenly all the action stopped, presumably because they saw the score and were scared off.

@charliec.6285 9 месяцев назад

I think that's just the riSK OR Peril setters have to be comfortable with when posting their puzzles there.

@Bonehead777 9 месяцев назад

@@deadeaded yeah,it is a real shame. Won’t stop me posting though. 🙂

@Bonehead777 9 месяцев назад

@@charliec.6285 It is. Hopefully, eventually I can get enough of a name for good folk to always have a try. 🙂

@BigAsciiHappyStar 8 месяцев назад

Ouch!

@rokualvin6428 7 месяцев назад

You have multiple nearly superhuman skills. It is a given that you have a brilliant mind for solving Sudoku puzzle. But you also have an incredible gift of sharing your thought processes on the fly. You bring the viewer along with you as you work. This combination is fantastic for a RU-vid Channel. And finally you have an enthusiasm for what you are doing, that is infectious. It is like a treasure hunter following a map, and feeling joy at each intellectual discovery, and not only feeling the glee of discovery, but sharing it with the viewer. I truly enjoy watching your videos!

@guyb7005 8 месяцев назад

49:18 I'm shouting at my screen "7 in box 8!!!" but alas, I am too entertained by your articulate wit and eventual mastery

@Rob-oj9bj 9 месяцев назад

One issue I came across while solving: If you put a correct digit in the puzzle which is also a "given" under the fog, it no longer clears fog AROUND the filled in cell. Not sure if this is intentional, but the first time it happened I thought I had made a mistake (filled in r7c4, nothing around it was cleared. Only indication that I had a correct digit, I realized after a moment, was the digit was black and not blue.)

@RichSmith77 8 месяцев назад

This issue caused me to waste half an hour rechecking logic that was correct all along. (Wasn't helped by having pre-coloured the cell, so the fog lifting just in the cell wasn't noticeable.)

@iancastro2414 8 месяцев назад

Fun fact, it's possible to prove that the corner digits are 1, 3, 7, and 9 without using the numbers "given" in box 5. You can only put 1 in row 1 in the cells R1C1 or R1C2, if you try to put in any other cell, you will get the following: * R1C1 will be 5. * R1C9 will be 3. * R1C2 will be equal to R2C4. * R1C8 will be equal to R2C6. And there is no place to put 5 in box 2. If you apply this to column 1, you will have that in column 1 the 1 can only be in R1C1 or R2C1, so to satisfy both conditions the 1 must be in R1C1. The same applies to 3, 7 and 9 for cells R1C9, R9C1, and R9C9, respectively.

@thomasstubtoft2544 8 месяцев назад

the way to logic the 5s away from the corners is to think of a cell next to the corner, ie. r1c2. Either it is a 5, which would prevent the corner from being 5, or it is not a 5, moving the 5s in the middleboxes to the edge by kingsmove, and again preventing 5s in the corners. Once I saw this and Simon did not, I could not keep watching as my yelling at the screen became to loud :) .... an skipping to the end, of cause Simon, master solver as he is, found another way.

@PeterFreese 2 месяца назад

Right - this would have immediately given him all 4 corners for 1,3,7,9.

@eddieharwood7788 8 месяцев назад

That was a really hard break in, but the thing that really held me up was nearing the end when a 9 failed to clear fog. I deleted a long way and got to the same point, so I went back almost to the beginning and still had the same problem. Then I though that perhaps I had accidentally coloured the cell with dark grey and lo and behold the gog disappeared. What a numpty!!!

@davidhughes7174 8 месяцев назад

A fog of war puzzle that turned into an amazing sudoku puzzle that ended up being re fogged in blue. Astonishing, again. Thank you Die Hard and Simon.

@ianward71 8 месяцев назад

Wow.. what a beautiful puzzle and a great solve by the maestro. Kudos to Simon and Die Hard

@TheDecagn 8 месяцев назад

I came to get a hint on this puzzle as I got stuck when the number 7 in box 3 (bottom left of box 3) did not reveal fog. After looking at the correct digit that simon put in, i saw that it is the same as I put in, so I’m annoyed that i spent so long trying to decipher why I was wrong when in reality I wasn’t, but the fog just decided to not reveal the surrounding area for some reason EDIT: after following through, I recognise that i managed to decipher that a 7 was there even though it was already given (after you clear fog), which is funny as from what I can tell, that 7 did not need to be a given!

@JasperJanssen 7 месяцев назад

Maybe it was given precisely to avoid fog lifting?

@titusadduxas 8 месяцев назад

I assumed 5s couldn’t be in the corner because I thought that with knights move puzzles Phistomofels theorem stopped the centre digit being in any of the 4square corners.

@RichSmith77 8 месяцев назад

Sorry , but that's not the rule. If a digit is missing from the Phistomefel ring, then it has to go in the centre. But this only applies that way round. It does not mean the reverse, that a digit in the centre cannot appear on the Phistomefel ring.

@VeritasUnae 8 месяцев назад

Such a sublime rule set. Very cool to see this solve, even if I didn't have the time to spend giving it a go myself tonight.

@dannystirling5458 7 месяцев назад

This puzzle was an amazing watch! My favorite moment was my realization that, with only 1 one on the board, the pink squares at 51:11 had to be a 1, since every other digit breaks a rule.

@NeilCrabbe 8 месяцев назад

I haven't got to let's get cracking yet, but my first thought when I saw a completely blank grid is there's a 5 in the middle. Then I read the rules and I still think there's a 5 in the middle. Is this the Dunning Kruger effect? Have I been watching CtC long enough to think I know what I'm doing?

@hewholimpsmartin 9 месяцев назад

That is terrifyingly amazing Excellent solve

@SuperPlienie 9 месяцев назад

I like all the puzzles but the fog ones always make me very happy!

@darthrainbows 8 месяцев назад

Brilliant puzzle! I had a devil of a time getting the break in, but once I figured it out, the solve was very satisfying.

@LarkyLuna 9 месяцев назад

I was trying to set a "digits see themselves on knights moves" sudoku on my free time This will be inspirational lol

@austinsinger7565 8 месяцев назад

I had to start over because I got stuck. After watching a few more minutes of you, I realize I had the rules wrong. The second was way better. I finished it in 40:25. Yay it felt good to finished one. This is my first solved puzzle since watching you. Now I can go back to see how you solve yours. I learn doing the section b first really help.

@leeway3739 8 месяцев назад

During my solve I think I found a glitch in the programing. I was able to place the 7 in box three via sudoku, but because there was a "given" 7 in that spot, it didn't clear the fog from the surrounding cells. Something maybe to look into?

@matthiasvancampen3770 8 месяцев назад

I think I might've overanalyzed it today. But you can now from the very bezinning (after putting the 5) that the corners are 1,3,7,9. Take a look at box 2 for example: the 3 bottom digits AND the central digit need to make an appearance in row 1. However as the central 5 sees all of these and they either rescue a number from row 1 (r1c3 or r1c7) or they must be special. Since two digits of this 4-some need to be special, you know they're the 1 and the 3 in row 1 that don't need to be 'rescued'. By symmetry 1 and 7 appears in column 1 and don't need ti be rescued. Therefore 1 is in the top left cell of box 1.

@cinny. 8 месяцев назад

This whole puzzle is really easy, actually. When you find 1 number, you immediately find another number. each number on opposite sides of the board (opposite sides of a line from bottom left to top right) add up to 10. Im pretty sure(?) this is correct

@pianissimo7121 8 месяцев назад

the box number digit always has to go in its own cell, ie, 1 in box 1 goes in cell 1 and 2 in box 2 goes in cell 2 etc. This can be done at the very start itself without needing any other clues simply because of the ruleset. That is amazing. Edit: I might be completely wrong. Need to check my logic. If someone else can prove/disprove me please feel free to do so.

@adrianhead6272 8 месяцев назад

I thought that too. It just seemed so obvious and yet no one (Simon included) mentioned it. It's probably why it got the average rating.

@pianissimo7121 8 месяцев назад

@@adrianhead6272 i didn't find that logic myself. I only got it after Simon pointed out how row 1 and column 1 works with the rules. What's funny is i thought Simon would find this when he mentioned about the 1,2,3 and 5 being in their own cells and then he forgot about it.

@RichSmith77 8 месяцев назад

Why does 1 have to go in position 1 in box 1, etc? That doesn't follow automatically from the rules.

@pianissimo7121 8 месяцев назад

@@RichSmith77 it kinda does. If 1 isn't in cell 1 in box 1 then the 1 in row or column 1 from box 2 or box 4 respectively will have to be a knights move away from box1 1. This means box1 1 is following 2 rules which is illegal, so the only way it can satisfy a single rule is if it's in box1 cell 1

@RichSmith77 8 месяцев назад

@@pianissimo7121 Sorry, I must be being slow. Why can't the 1 in row 1 be in box 4 and be a knight's move away from a 1 in box 7 (or vice versa)?

@memyself8340 8 месяцев назад

From 13:31 to 14:50, Simon explains why his "5" pencil mark is removed from fows 2 & 8, and columns 2 & 8. Which then removes 5 as an option in the corners. Then at 20:05 to 20:20 he almost sees it again. I love it when I see a logic that he doesn't, but he always finds lots of ligic that I don't. Therefore, he always wins and I am entertained. Thank you Simon. (If you ever hear me yelling at the screen, just remember that I have time to scan while you are doing the hard work.)

@stephenleow9876 8 месяцев назад

I spotted some faulty logic that gave a 2 early at: 29:00 A 2 in the middle of Box 2 is NOT in its own box; it's in square 5 of box 2. I believe the correct logic would be to get the 2 in box 9 first, then once you have the 2s in columns 3 and 7 you can properly get the 2 in column 5 and go from there.

@Jagnathbaba 6 месяцев назад

What I like about this puzzle is the fact that the conditions are relatively easy to understand but you have to keep thinking about its implications on different positions in the sudoku. Like, how you started with a 5 in the center, then went to the corners and then went to the middle cells etc. You basically keep discovering new things which is amazing.

@jrparker811 8 месяцев назад

This is an incredible work of art. A beautiful puzzle. Everyone should give it a go. There are logical conclusions on the placement of digits just from the rule set. Then the fog starts to lift.

@altreusplays 8 месяцев назад

This rule set is tremendous! I love the device of requiring each cell to meet one rule but not more than one.

@BanaiFeldstein 9 месяцев назад

If you stick with the fives at the beginning, plus look at those cells where there's only one place to put a number a knight's move away, you can figure out that five can't go in any corners because they have nowhere to go in other boxes, the stuff he got to somewhere in the 40-50 minute section.

@DominikWegerle 8 месяцев назад

That was my thinking as well, but i'm not shure if that can be logically deducted. He mentioned it at 13:35 and then never ever got back to this restriction.

@JakeRoeder 8 месяцев назад

It would have taken me DECADES to come to the conclusions that Simon needed to move forward after recognizing the corner constraints. But, man, was that ever the most brilliant deduction! Well played, Die Hard, well played.

@derekswager 9 месяцев назад

at about 50 minutes into the video I noticed the 10's compliment rotational symmetry

@longwaytotipperary 9 месяцев назад

Oh yay! Foggy puzzle!!! Recovering from nasty virus watching all my favorite RU-vids and eating ice cream!! Feeling much better!!

@escapedlunatic27 7 месяцев назад

I did solve this eventually, but there were a couple of points at which I had to "cheat" by guessing. Fascinating to see the deductions Simon made which I missed - but even more so that such a puzzle can exist at all. It seems amazing that just those conditions, and the specification that (except for the centre cell) they're mutually exclusive, can not only lead to a unique solution but make it possible to deduce. Kudos to the composer.

@Mephistahpheles 8 месяцев назад

@40:00 Simon gets the 2 which was my first digit. I used the "2 in it's own box" which forces the 2 in box 1 to be paired with a 2 in box 4. That quickly leads to the 2 in box 9. And that's the end of my "brilliance". Didn't get far in the puzzle at all. I was somewhat surprised Simon didn't pick it up immediately after the "naked 9". The two 2's in rows 6 & 7 force it, as well.

@charliecarrot 8 месяцев назад

This is an amazing puzzle! Such a joy to watch

@cerebralcomics 8 месяцев назад

Halfway through the puzzle, but its already very amazing!

@HalfBakedLunatic 8 месяцев назад

Excellent! I have a few puzzles on Logic Masters Germany where I think the ratings have been unfairly stifled ... so I know how you feel!

@NightChime 8 месяцев назад

1:00:59 - A tidbit of logic I enjoyed here in box 9 with the 146s, is that because the grey digits can't be 6, there must be a 6 between red and green. Take that to box 8, and the orange digit is 14. Granted, I don't recall if that does a whole lot, but it's a fun little extrapolation.

@justinfarmer8371 Месяц назад

Only Simon can get excited for the same logic in the same puzzle lol grate solve

@mike1024. 3 месяца назад

I love the way this puzzle starts right off the bat.

@Mennoo_ 8 месяцев назад

I remember this one while it was still up for testing in the CtC Discord server. Unfortunately it had some issues with pencilmarking foggy cells, where given digits in the fog couldn't be pencilmarked. Lucky that issue has been resolved by Sven. When I tested this, I made one assumption that the corner cells would be the box numbers, and was able to continue from there in the the version of the puzzle at that time had much more given digits in the corner boxes. Problem at that time was that a lot of pencilmarks would had to be eliminated by a suddenly revealed given digit. It's good to see that Die Hard significantly improved that process. The puzzle seems to flow much more natural now. Die Hard later explained in the discord server the method involving those digits against the middle of the centerbox' edges, but I didn't quite get it at that time. So thanks a lot for explaining that part so clearly. Only really good sudoku solvers would be able to deduce such logic. If you are able to put such logic in your puzzle, you deserve nothing but praise for that (and definitely more than a 74% rating). In my opinion, people shouldn't rate puzzles on LMD very low (unless it's obviously designed very badly). Even if you don't like the solving partly, there is always a part where you can at least admire the logic that went into the puzzle. Every puzzle on LMD is created by someone who spent time on it, and imo that should never be demotivated by a ridiculously low score. I saw it also with my first puzzle I posted on LMD (still my only one for now). It got to a point where it was rated very highly with 95%, but one 0%-rating dropped it to 90% (puzzle has 5* difficulty, so not many solvers, hence a bigger impact). And even tho he messaged me with reasoning and feedback which I do appreciate, I still believe that 0%-ratings would be irrationally low, and either 40%-ratings should be the lowests you should give for a puzzle for which you see time and effort has been put into it. Nevertheless. This puzzle and the solve path i've seen now deserves all the credits. Good job Die Hard!

8 месяцев назад

Wonderful puzzle! Knights move relations are a fascinating subject. Note for the cognoscenti: sudokus with a great amount of symmetry in its solution grid has its equal digits in knight move relations. Known for setting symmetric puzzles I have set puzzles where all digits are in knights move relation when you view the grid in a toroidal manner. This puzzle makes clever use of not viewing the grid in a toroidal manner and the fact that numerically symmetric puzzles has the digit 5 in the center square.

@brunomcleod 7 месяцев назад

1:07:49 the subtitles interpret the f and the d (the frequencies of the other notes likely come into it) as the word "thank" and "you"! That's awesome

@vananything 8 месяцев назад

This is easily in my top 5 of puzzles featured on this channel. (Top 3, maybe?) It one of those ones where it feels like there's some fundamental mathematical principle to it that's just out of my grasp… it must have been invigorating to discover when setting!

@user-cz1qb8zt2h 7 месяцев назад

I've been doing sudoku (at best to average level) for years without knowing there was an 'adjaceny' rule........... Doh! Came across this site yesterday & this puzzle today. Made good progress on this one by learning that u gotta read the rules, CAREFULLY. Onwards & upwards.

@studgerbil9081 9 месяцев назад

No idea why this was rated so low. The ten digits were hardly given since they were obscured. The break in "5" was easy but nothing else was easy at all.

@MikeMJPMUNCH 8 месяцев назад

I'm confused by the rule set as it says "Each digit satisfies only one of the following conditions" but there are a few numbers that are both a chess knight's move away and in normal reading order.

@RichSmith77 8 месяцев назад

"in reading order" just means the boxes are numbered left to right, top to bottom, so 1 2 3 4 5 6 7 8 9 Condition 2 is met by any digit in its box number, e.g. the 9 in box 9 (the box in the bottom right).

@TeamCykelhold 7 месяцев назад

@@RichSmith77 yes and plenty of them are and satsified more than one condition since they are ALSO a knights move away from itself. Look at number 2 in the fourth box.

@RichSmith77 7 месяцев назад

@@TeamCykelholdThat's only satisfying condition (a), namely it's a knight's move away from another 2. It fails (b) as it's in box 4, not box 2. It fails (c) as it's not a 5. So it satisfies exactly one of the three conditions. The position within a box is irrelevant. The boxes (not cell positions) are numbered according to reading order. Box 2 is the top middle box. Only a 2 in box 2 has to avoid being a knight's move away from another 2.

@TeamCykelhold 7 месяцев назад

@@RichSmith77 Aah ok I see. Thanks.

@scarfboyxiv 8 месяцев назад

Let me start by saying this is my first solve of any puzzle featured by the channel. I started watching last year and have always been a huge fan of sudoku-style puzzles-the wildest variant I had tried beforehand was Wordoku, but there are only so many non-repeating 9-letter words. The Fog of War mechanic really intrigued me since Simon started featuring such puzzles. I had always been curious to try solving some myself, but I always ended up watching the video first. I feel that if I immediately go to solve the puzzle after I watch the video that feels like cheating. This unique ruleset really spoke to me, though, and so I finally tried my hand at the puzzle first before watching the video. What fun this puzzle was! Now, granted, tricks like The Secret™and the Phistomephel Ring are not as useful as they typically are, and I have not watched the video as of this writing so I have not learned Simon's newest discovery yet, but this was a fantastic test of logical digit placements! I started my reasoning with the center digit as there was an obvious way to fulfill its exception but worth it to prove to yourself why it works that way. I also took longer during my solve to fully understand the true meaning of the second constraint-whether that placement was intentional or accidental-as I kept telling myself that the logic behind it was fallacial. As Die Hard explained, guessing was not allowed so I forced myself to explain to myself why that placement works. I did get there in the end after solving completely for the 2s, 7s, and 8s starting with box 9. 4 and 6 were definitely my hardest digits to place, especially in reminding myself that no knight's move can reach the digits in their respective boxes. I did almost fall for that trap in my logic. Twice. But when I noticed a certain special property of the center box, everything else pretty much fell into place. You could say Die Hard summed it up nicely. (I did take a curious peak into the comments in the middle of my solve and saw some people saying things about other transitive properties of the puzzle, but that all flew over my head pre-video-watching.) I also did get confused by R4C2 with SudokuPad's "feature", but thankfully I noticed the shadow of the fog breaking away. Oh, and the black number eventually. I finished with a time of 158:26, though I think a sixth of that time could be cut for formatting my solve. I don't have Simon's fancy setup and I color coded each digit. I'm still proud I managed to solve this puzzle. Die Hard, thank you for inspiring me to actually solve one of these. Like I said at the start, this was a fun solve! I can't wait to see more of these kind of foggy logic restraints in the future.

@nightmotherasmr 8 месяцев назад

I don't understand any of this, but I love how happy Simon is when he figures something out :) I just watch for the positivity.

@inspiringsand123 8 месяцев назад

Rules: 01:47 Let's Get Cracking: 08:05 Simon's time: 57m51s Puzzle Solved: 1:05:56 What about this video's Top Tier Simarkisms?! Bobbins: 1x (33:21) Knowledge Bomb: 1x (10:33) Three In the Corner: 1x (29:38) Cooking with Gas: 1x (15:40) You Rotten Thing: 1x (29:28) And how about this video's Simarkisms?! By Sudoku: 14x (10:00, 50:04, 51:23, 52:04, 53:32, 57:26, 58:09, 58:12, 59:27, 59:30, 1:00:05, 1:02:40, 1:03:09, 1:04:35) Ah: 12x (01:14, 12:14, 12:14, 20:45, 25:32, 29:28, 40:27, 41:17, 49:04, 56:37, 59:01, 1:03:27) Hang On: 11x (03:54, 25:23, 25:23, 45:02, 45:02, 45:54, 45:54, 46:50, 56:28, 56:34, 1:05:59) Sorry: 6x (00:37, 15:44, 19:18, 27:33, 33:24, 1:05:32) Obviously: 6x (02:09, 04:12, 09:57, 16:26, 27:02, 1:05:43) Incredible: 5x (26:38, 59:49, 1:06:53, 1:06:53, 1:07:28) Nature: 5x (26:31, 34:06, 51:12, 57:14, 1:06:40) Pencil Mark/mark: 5x (33:56, 36:17, 40:08, 49:06, 55:06) The Answer is: 4x (21:40, 37:07, 41:53, 56:49) Surely: 4x (31:28, 39:20, 54:28, 1:07:26) In Fact: 4x (07:20, 22:49, 39:46, 1:02:54) Beautiful: 3x (05:57, 31:40, 31:40) What Does This Mean?: 3x (09:16, 47:42, 57:20) Naughty: 2x (25:39, 42:10) Lovely: 2x (29:27, 59:15) Intriguing: 2x (00:30, 05:27) Good Grief: 1x (40:16) What on Earth: 1x (35:51) Goodness: 1x (26:25) Out of Nowhere: 1x (51:23) Nonsense: 1x (29:20) Bingo: 1x (25:20) Stuck: 1x (47:57) Horrible Feeling: 1x (19:18) Brilliant: 1x (1:02:54) Break the Puzzle: 1x (24:35) Fascinating: 1x (26:16) Extraordinary: 1x (05:10) Ridiculous: 1x (1:05:53) Deadly Pattern: 1x (49:22) Unbelievable: 1x (26:19) Full stop: 1x (1:06:11) Whoopsie: 1x (53:25) Fabulous: 1x (36:46) Juxtaposition: 1x (59:15) That's Huge: 1x (56:37) Panache: 1x (1:06:34) Cake!: 1x (07:53) Ab Initio: 1x (16:44) Symmetry: 1x (16:36) Most popular number(>9), digit and colour this video: Sixty, Seventy Three (2 mentions) Five (123 mentions) Blue (21 mentions) Antithesis Battles: Even (2) - Odd (0) Shaded (2) - Unshaded (0) Outside (2) - Inside (0) White (2) - Black (0) Column (20) - Row (13) 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!

@Lifeheart 8 месяцев назад

I love watching Simon seem baffled when things are solved by sudoku after doing complicated logic. Like he's dropping out of warp 🤣

@StarClan4evr 5 месяцев назад

Had to watch to 37:06 to solve. Absolutely wonderful puzzle. After that break-in it was a great time of me tying digits together in a little buddy-system, deserved recommendation from me :D

@peterhowitt3861 8 месяцев назад

I was totally baffled by Simon's logic path on this one, unless I completely misread the rule which I don't think I did.

@Kradlum 8 месяцев назад

Incredible puzzle and solve!

@danielepicone1480 8 месяцев назад

I tried this puzzle myself and the second digit I got was r3c7, which to my surprise was a given digit and hence did not reveal any fog! I think this bug is part of the reasons why it has such low rating.

@joeg451 8 месяцев назад

"Two is not five, unless you turn it upside-down" Simon, I have a secret to share with you...

@Zorrky 8 месяцев назад

My eureka moment was when i realized the box digit has to be in the digit number place as well. Strange Simon had that idea as well pretty early, but he didn't think it through and the key being the middle digit what do 2 conditions at once. But for every other digit, in order NOT to meet 2 conditions, they have to all be in their digit place on it's own box. And you can pretty much deduce at the very start, almost making the whole puzzle visible. Very nice! :)

@SG2048-meta 7 месяцев назад

I just don’t understand this though. I can’t figure out why the box digit will satisfy 2 conditions if it isn’t in its digit number place. I’ve been thinking about this for a while but I really cannot figure it out. Can somebody explain this in simple terms?

@Zorrky 7 месяцев назад

@@SG2048-meta Because othervise you just couldn't fill row 1, column 1, row 9 and column 9 with the digits 1 to 9 (once only for total). As you can see, the digits are all are on the perimeter and since normal sodoku rules do apply, every box contain it's own digit (like box 4 must contain a 4), but that's already meets it's requriment. Now, if you don't put 4 (in box four) to it's number place, you literally can't put 4 in row 1 to meet it's own condotion or if you do, it will break the "only one condition can apply" rule. Try to just put 4 in anywhere else in box 4 than it's own number and you will realize, in column 1, it MUST be there. And that logic apply to every digit in it's own box. But it was an eureka moment, i can't recall my tought process quite clearly now, it happened in an instant.

@SG2048-meta 7 месяцев назад

@@Zorrkyaaah I see now!

@kaistoffel92 8 месяцев назад

Amazing puzzle. I cant even fathom of how youd start to set a puzzle like this.

@matthewbondi380 9 месяцев назад

I immediately made a mistake by assuming the corner 1, 3, 7, and 9 were givens like the center 5, overlooking that they could indeed be 5s and satisfy a condition. I was correct, but didn't notice my overreach until after I cleared the fog :(

@IBAndreas 8 месяцев назад

I made exactly this same error by first placing the 5 and then placing 1 in 1,1 2 in 2,2 3 in 3,3 etc. However, even though I totally neglected the possibility of 5 being a digit the fog was indeed revealed now in every single box and made for an easier solve. I didnt even realize the error of my reasoning until AFTER solving and then watching Simons solve and scrolling down for this comment. I can totally understand the easy ratings on LMD. I would have rated this a 2 and just assumed my (lucky) solve path was correctly reasoned.

@Antiknight 8 месяцев назад

I really liked the second step in this puzzle! I think it deserves a higher rating.

@rizka7945 9 месяцев назад

Interesting how you can start the puzzle with (at least) two different logics: 1) Simon argues that for the center cell to fulfill two conditions it has to be a 5. 2) My argument was that the 5 in the center box automatically fulfills at least two conditions so it has to go the center cell.

@gogogo123454321 9 месяцев назад

That's the same logic.

@steve470 9 месяцев назад

@@gogogo123454321 "There's only one digit that can be placed in the central cell" and "There's only one place 5 can go in box five" are not the same logic.

@mareksroka5629 9 месяцев назад

@@gogogo123454321not quite. One is saying that the center cell can ONLY be a 5. ("what are the option for that cell?") The second is saying that 5 can ONLY go in the center cell.("where can 5 goes in box 5?")

@rizka7945 8 месяцев назад

@@gogogo123454321 It's the same conclusion through different means.

@fynnsternis6432 2 месяца назад

i love negative constraints like that but they are usually the hardest because you have to think so much differently

@lin-ni2885 Месяц назад

there was nothing more infuriating than having you have eight sevens and then just moving on to another digit

@rectrlgaming 3 месяца назад

don't know if anyone noticed this but there is a flaw in the rules , that is the five in the middle box (5) either satisfy three conditions if its in the center or two if its not and that is not allowed.

@epylar2 2 месяца назад

Two is allowed

@rectrlgaming 2 месяца назад

@@epylar2 but three?

@lex1fy 23 дня назад

painful how simon realised so early that the bottom right HAD to be a 9 but didn't place it until 46 minutes in

@rustypotatoes 8 месяцев назад

I love simons mini heart attack at the end 😂❤

@wojciechpietrzak1981 8 месяцев назад

I liked it very much how some of the logic steps synergized with my chess knowledge and experience. I mean: denying the possible digits seeing each other by a knight's move due to sudoku row or column logic is the same as trapping a knight with a rook in a game of chess.

@andilee3537 8 месяцев назад

I think the rating is about right. It has a fascinating break-in the early part to clear some fog is full of discovery, but eventually it just descends into a horrible morass that has no clear path through it. A great idea that had a terrible ending. I got so bored i gave up shortly after clearing all the fog.

@penningmeestercgkdelft9159 8 месяцев назад

What a nice puzzle! :-) The resulting grid shows a lot of rotational symmetry, where all non-5 digits and their 180-degree rotated counterparts sum to 10. And indeed, the rows and columns 1-5-9 eventually form a sort of disjoint set of friendly digits. By the way, has this been the first occasion that there are actually some given digits popping up from underneath the fog?

@FirstRecords204 7 месяцев назад

this is the first video on this channel i've ever watched where i actually figured something out before simon (the center digit must be 5) and got to feel smart about it

@koenth2359 8 месяцев назад

Here's an idea maybe for Sven to consider, in order to discourage just guessing to clear fog. Wrong guesses will increment a variable keeping the wrong-right count balance for that cell, and every time the right number is entered, it will decrement the cell's variable again. Fog will only clear once the count is negative. So if, due to a mistake, the fog does not clear away, you'll have to enter the right number twice (by entering it, erasing it and reentering).

@lucaspromero6926 8 месяцев назад

THAT WAS SO AWESOME WOOOO GREAT VID AND SOLVE

@penningmeestercgkdelft9159 8 месяцев назад

Maybe Die Hard could also design a Jules Verne-themed "Phileas Fogg-Of-War" puzzle, named "Around The World in 81 digits", with a nice Passepartout around the grid...? Surely he could Fix this...