The Best Fog Of War Sudoku Puzzle Of Them All?

[@MrGrog90]

gdc here. Thanks for this feature and also to you Simon, for the idea. I only set one yin yang puzzle before this one and both time I had so much fun doing it. Hope you are all having a great start into the new year!

[@PeterZaitcev]

Is it true that reversing this puzzle's shading gives the second correct answer? Math won't change if you multiply EVERY number by a factor of -1.

[@MrGrog90]

​@@PeterZaitcev Yes, I actually thought about not giving a shading for that reason but then decided it might lead to confusion so I put a "redundant" orange into box 9.

[@PeterZaitcev]

​@@MrGrog90ahahah, I didn't even noticed it since I use the very same color for highlighting cells blocked by selection.

[@David_K_Booth]

It's a very engaging puzzle. Well done!

[@achad1607]

@@MrGrog90 If you are going to play with Simon's head, play with Simon's head!

[@Itstoearly]

I think what I appreciate the most about these videos is how accessible they are. No matter how common a bit of logic might be, you and Mark always take the time to explain it, even something as basic as what it means when we're told "Normal Sudoku rules apply". Thank you for all the efforts!

[@Paolo_De_Leva]

As far as I know, negative numbers were first used by *Jay Dyer,* the great master of *modifiers,* in three puzzles within their magnificent puzzle hunt: *Numeric Alchemy.*

[@meiter]

That puzzle hunt was probably my favourite of the past 2 years. I did it again just a couple of weeks ago and was still amazed although I remembered parts of the logic. What a treasure of puzzles

[@Paolo_De_Leva]

@@meiter Yes, it was amazing, awesome, outstanding, magic. All puzzles with similar ruleset but better and better, each containing its own logic treasure. I wish I was Simon and could find the right adjectives to describe it.

[@StephenMarkTurner]

I remember Kenneth Williams as the guy in the "Carry On" films, which probably doesn't reflect well on how cultured I am.

[@rsshysh]

At 52:11 how does simon know how the line goes on in box 4? Couldn't the little part you see in box 4 just be from another zipper?

[@victoriam6569]

Good catch! I'm not sure, but I think in this situation, when you have several lines in the cell, the lines are not centered. (Like in R4C56)

[@richbuckingham]

because the zipper going from box4 into box3 has to use exactly 2 squares in box 3 so you can tell that the other end of the zipper is r6c5.

[@RichSmith77]

I think you're right. The line coming down from r5c3 in box 4 could have done something similar to the line coming down from r3c6. It could have turned left before reaching the centre of the cell, and not connected with the line coming from box 5. It's a bit unexpected, but then there's an example of a line doing this already in the grid, that one coming down from box 2.

[@steve470]

Logic that doesn't rely on that assumption: We definitely know that r6c3 and r6c6 match, and sum to +1, so those two cells must contain consecutive digits. Simon's yin-yang logic showed that r6c3 must be one greater than r6c6. By sudoku, r6c6 can only be 3, 4, or 7. But 4 or 7 would force 5 or 8 into r6c3 - neither of which is possible. Therefore r6c6 must be 3, r6c3 must be 4, and we can see the rest of the line.

[@patrickgass787]

I initially shared Simon's trepidation about negative digits in the grid but you can always trust gdc to deliver a quality experience; they've proven themselves as both a master of Zipper logic and now a master of Fog-of-War as well. Looking forward to their next appearance!

[@alanclarke4646]

The two greatest storytellers on children's TV were Kenneth Williams and Bernard Cribbins.

[@OrcWoodworks]

Petition for gdc to make a fog of war puzzle composed solely of single pixel grid furniture

[@PleegWat]

Regarding the badly rated fog puzzles, I suspect these are people who know perfectly well how you're supposed to do it, they just failed to solve it. For fog puzzles, and only for fog puzzles, it is possible for someone who failed to solve the puzzle to then brute force it and rate it anyway.

[@steve470]

It's also possible for any sudoku variant that only contains common rules. In that case, someone can pop the puzzle into f-puzzles and have it solve it for them. Certainly easier for fog puzzles, and puts them at a significant rating disadvantage. But it also puts puzzles with unique rules at an advantage, so we probably see more of those on the channel than we would otherwise.

[@inspiringsand123]

Rules: 07:44 Let's Get Cracking: 11:48 Simon's time: 56m55s Puzzle Solved: 1:08:43 What about this video's Top Tier Simarkisms?! The Secret: 4x (06:52, 14:39, 14:44, 14:45) Maverick: 2x (03:56, 04:00) And how about this video's Simarkisms?! In Fact: 14x (02:17, 08:37, 12:30, 16:29, 18:47, 25:41, 25:56, 29:28, 36:01, 37:16, 43:13, 43:45, 48:06, 59:00) Ah: 12x (13:38, 14:29, 18:30, 18:30, 26:04, 28:08, 29:55, 34:48, 50:01, 50:35, 1:02:36, 1:06:19) Beautiful: 11x (18:44, 18:44, 19:29, 19:31, 25:02, 30:20, 52:39, 53:19, 53:24, 58:25, 1:08:54) Sorry: 10x (05:05, 05:14, 06:38, 08:48, 27:24, 38:31, 40:57, 41:47, 49:21, 1:01:33) Hang On: 10x (24:48, 25:28, 28:25, 33:25, 39:11, 40:45, 40:45, 48:41, 59:16, 1:06:56) Checkerboard: 10x (14:51, 15:37, 15:44, 20:36, 40:33, 44:08, 50:48, 51:15, 53:15, 1:05:08) By Sudoku: 8x (31:51, 37:51, 46:02, 1:03:52, 1:07:11, 1:08:10, 1:08:26) Pencil Mark/mark: 8x (32:34, 32:37, 46:24, 48:20, 56:01, 56:57, 1:00:27, 1:06:52) What Does This Mean?: 6x (10:56, 15:27, 26:42, 39:09, 50:01, 56:34) Gorgeous: 5x (24:49, 24:53, 36:55, 36:59, 1:09:05) Clever: 4x (30:36, 34:13, 1:08:50, 1:08:54) Brilliant: 3x (02:01, 02:06, 1:08:32) Wow: 3x (20:42, 1:08:39, 1:08:39) Cake!: 3x (04:19, 04:32, 05:52) Goodness: 2x (18:47, 26:15) The Answer is: 2x (34:03, 53:09) Break the Puzzle: 2x (15:51, 16:31) Extraordinary: 2x (20:03, 20:06) Shouting: 2x (04:51, 1:07:46) Obviously: 2x (15:16, 47:18) What on Earth: 1x (35:28) Apologies: 1x (1:07:46) Nonsense: 1x (28:08) Take a Bow: 1x (1:08:39) Witty: 1x (1:08:54) Surely: 1x (45:21) I've Got It!: 1x (28:46) Intriguing: 1x (14:36) Progress: 1x (49:37) Chromatic: 1x (09:46) Fabulous: 1x (1:09:49) That is Sick: 1x (24:58) Have a Think: 1x (56:55) Weird: 1x (40:04) Most popular number(>9), digit and colour this video: Ten (5 mentions) Two (88 mentions) Blue (43 mentions) Antithesis Battles: Low (3) - High (1) Even (21) - Odd (4) Shaded (6) - Unshaded (5) Higher (2) - Lower (1) Row (6) - Column (5) 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!

[@ingiford175]

at 1:01:45 watching him reduce box 4 row 6, not seeing that 1/9 pair in row 4 and row 5 so that is a 1/9 pair and watch him eliminate digits one by one was slightly painful.

[@stangerrits6712]

Box 5 could have been pencil marked much earlier based on the logic for the line there and sudoku, placing 4-5-6 in row 5, so 2-7 in row 6.

[@anibotic]

I really like the idea of negative numbers & loved solving the puzzle but this puzzle have the uniqueness issue from yin-yang perspective, the available shaded cell is not so easily recognizable, So, it's possible to reach both conclusions: -5 + 3 = -2 or 5 - 3 = 2(for e.g.). So, for future references, I wud rather suggest to mention in the puzzle rules if any particular given cell is shaded or unshaded. Hope this idea helps for an even better puzzle experience.(Haven't watched the video yet).

[@stevieinselby]

As nobody does a yin yang ☯️ puzzle with shaded and unshaded cells, but always with two different colours of shaded cells, it seems quite appropriate that either one of the colours could be the shaded or unshaded variety 🤔

[@MattYDdraig]

32:57 Absolutely brilliant. Would love to see more negative values used. Note that in this case reversing the shading leaves everything still correct, maybe the next version can use products (which would have the same feature!)😂

[@AndrewYakovenko]

Uncharacteristically for me, I got that one reasonably fast in 27:07, and it was a lot of fun. I generally enjoy both fog of war and ying yang puzzles, and this was a marvelous combination of both.

[@philwheatley5057]

Me too. Done in 29:15. I got the perimeter in 30 seconds and box 9 worked out in about 3 minutes.

[@TurquoizeGoldscraper]

45:36 for me. The puzzle works if you flip the shading, so you could've ignored the orange in R9C8 (or shaded it something else to mean negative) and it will still solve in the same way.

[@jakesullivan8220]

I was wondering how Simon determined that r8c8 and r9c8 were both positive at the start, then I made the same realization as you, works either way

[@ferociousbiscuit]

This was my first thought as well. Then I also came to the conclusion that the cells having the same polarity is the important part and "positive" vs "negative" is arbitrary.

[@AnnaVahtera]

@@jakesullivan8220 Probably because r9c8 was already shaded orange in the puzzle setup.

[@maljamin]

Same thought here, but only because I misread the rules and thought orange was negative. Started solving a bit, realized mistake and wondered if doing it backwards would've worked.

[@jasonb111222]

I'm colorblind and could not tell if that cell was orange, so I was just completely stuck.

[@AlphaNumericNZ0]

Fun puzzle. Thought it flowed very well.

[@Vedvart1]

Interestingly, the puzzle is equally as solvable without that initial slight-orange shading - by simply negating every number in the puzzle, the given rules and constraints must all still hold. So it doesn't matter which set is positive and which is negative - both will work!

[@HunterJE]

But then the puzzle is no longer unique - there are two equally valid solutions (similar to if you have uninterrupted like pairs in an X-wing pattern)

[@Vedvart1]

@@HunterJE I suppose that's true - for some reason I usually only think of the digits themselves being the solution, while colorings and whatnot associated with the solution just being part of the solve path. I suppose it would be more correct to say: even without knowing which set is positive and which is negative, you can still obtain a single unique set of digits which provably satisfy the constraints.

[@MrGrog90]

gdc here. Excellent point made in this comment. I was thinking about leaving out the shading and mentioning that it's okay to not know which 'half' is positive and which 'half' is negative and I actually did that in another puzzle (Sub Zero Nabner). But eventually I thought, it's just going to lead to confusion in a puzzle that already sounds quite intimidating so I put an orange into evil edna.

[@RedBarchetta2019]

Correct. Multiply an entire equation by -1 and it is still a true equation.

[@victoriam6569]

And here I am, somehow not noticing initial colored cell, solved the puzzle wondering which of my colors should be orange XD😅 Only your comment helped me to get it 😅

[@martysears]

Don't forget the Moog and Carwash the green cat. Used to love Willo the Wisp too :D This puzzle rocks. Gonna watch the rest of the video now

[@Sponsie1000]

l really liked this puzzle because l feel like it was exactly on my skill level. Not too easy but also fairly consistent progress to overall take about an hour. Exactly the challenge-level l was looking for and a fun ruleset to boot :]

[@stevieinselby]

Great puzzle 👍🏻 as we would expect from a gdc fog puzzle! It took me 35 minutes, so I was pleasantly surprised to beat the video length by so much, especially as this time I _don't_ think I bypassed any logic with lucky guesses! Glad to see that Simon had the same temporary brainfart that I did wondering if we could have a solitary unshaded cell in the perimeter in r9c9 before realising what a daft proposition that was 😜

[@TheClawNinja]

I'm always astounded at how these setters can create these masterpieces. Great puzzle!

[@Orenotter]

My orange and blue were contiguous Yet two cells remained quite ambiguous In the end, I attest, I did what looked the best 'Cause I like how it's zaggy and ziguous. Edit: Whoops. i got the polarity of R8C6 wrong.

[@iambicpentakill]

I enjoyed that bit of poetry, thanks for sharing!

[@MarcusTheDorkus]

68:21! I thought the negatives were going to be a nightmare but that was actually quite a smooth solving puzzle. Very good puzzle

[@longwaytotipperary]

Oh yay a foggy puzzle!! Home sick and this is my afternoon entertainment! So sorry about your plumbing problem!

[@davidrattner9]

Feel better soon my friend. Hot tea and blanket along with CTC hoodie on the way to you. With of course the warmth of Simon's voice and his great solving for us.

[@rachelriesling9112]

This is also me in a nutshell, thank you Simon for your videos and good luck getting the pipes all sorted!

[@longwaytotipperary]

@@davidrattner9 thank you, my friend. On medication which seems to be helping. Yes, plenty of hot tea! And Simon and your good wishes! And lots of naps.

[@longwaytotipperary]

@@rachelriesling9112 are you sick also? If so, hope you get well quickly!

[@rachelriesling9112]

@longwaytotipperary yup, got a hacking cough unfortunately. Fingers crossed we can both get some good rest and get back on our feet soon!

[@brianshilling]

27:14 for me. What a great puzzle. That cheeky one with the 2 toward the end was delightful

[@spencerss4908]

I pulled a simon on this one... I did 80% of the puzzle and then got stuck until I realized my 8,9 pair in box 9 could be resolved because I had gotten the other two digits ages ago.... Still beat it in sub 30 min which makes me happy Thanks for the great puzzle:)

[@emilywilliams3237]

I enjoyed this very much - I did not solve the puzzle, but I loved watching you do it, Simon. Thank you!

[@theadjectiveform]

Not sure about the logic around 53:00 where Simon is assuming those two line-tips are the ends of the line in the central box. We've already seen that zipper lines are able to overlap cells in this puzzle, so I don't think it's valid to assume that that line necessarily extends on to r5c3; that could be part of a different zipper. (The puzzle is still solvable without that assumption.)

[@VinnyF3]

Using scratch paper like they do in lotto tickets would make physical fog of war possible, although it'd certainly be super expensive

[@trailblazer225]

Yes but you'd have to know you wrote in the correct digit to know whether or not you should scratch it off and reveal the next clue

[@srwapo]

27:31, just flowed for me, spun my wheels for a minute at the end forgetting about the very start of the puzzle and me not finishing using that line.

[@thaynepeterson7896]

I got my books yesterday - they seem too beautiful to solve. . . . Ok, that was a lie (though they are beautiful) - they ae too intimidating to solve.

[@ShakalDraconis]

at 53:32, is it logical to assume that r5c3 and r6c5 are the tips of the line centered on r4c5? we see that the line enters r6c3 from the northeast, but the line segment in r5c3 could be part of a separate line, with both lines passing through r6c3. Such as we see in r4c6.

[@libbilation]

31:44! More yin yang sudokus please, my mind seems to really just get them :D

[@jasperb7890]

What a nice flow to the puzzle gdc! Great concept with the yin-yang and negative numbers summing on the lines. Just marvellous. Well done

[@JasperJanssen]

“ 17:49 And the moment this is blue, it’s the only blue in the entire perimeter” no, Simon, the moment that is blue it is the only blue *in the entire puzzle*. Which is not a thing.

[@ronjohnson6916]

Maverick in a Stuka today? Never heard him so noisy.

[@johnpauladamovsky86]

Somebody should turn these puzzles into an accredited 4-year baccalaureate degree...!

[@LachlanCannon]

So the obvious next step is negative/positive Schrodinger zippers, right? :)

[@sandhinfk]

I did not solve the puzzle by myself, but I have a quick question for anyone knows. At around 52:20, how can you assume the line in box 5 ends in r5c3 such that Simon assumes r5c3 and r6c5 is a pair, as row 6 is still in fog?

[@RichSmith77]

Someone else raised this point. I think Simon made an assumption here, but if he had done the step he does at 55:40, to get r6c3 (and r6c6), first, then he would have revealed the path of the line through r6c3.

[@mxpxorsist]

wasted 10 minutes at the start because the circle is not visible in dark mode

[@hungryhangman250]

I did this one. The hardest I’ve ever finished. It took me 2 hours

[@michaurbanski5961]

The two cells at 12:40 could very well be both negative

[@murrrdurr]

The creator had already made the first circle orange, its a bit vague but if you look closely you can see the orange starting square

[@michiel412]

It's somewhat hard to see due to different colouring, but R9C8 being shaded orange is given as a starting clue.

[@felemiah]

That's what I thought too, but I think there's actually two solutions when it comes to the shading rule. I think in the end you could reverse the shading on the entire board (shaded to unshaded, and vice versa), so you're free to choose one of the possible patterns with your starting cells.

[@LednacekZ]

it does not matter. the maths are the same either way around. he chose positive.

[@Lusankya2]

As far as I understand the first cell was already marked orange by the puzzle itself.

[@donaldsnyder1543]

If only he would do sudoku in the sudoku puzzle.

[@gibbbon]

first time my beating time is shorter than the video! ... but still 12 min longer than your actual solving time without all the before and after talking XD

[@YellowBunny]

It took me 45:30 to find both solutions. But I knew from reading the rules that there couldn't be a unique solution unless there was a shaded cell hidden somewhere under the fog.

[@jonhansen9622]

A suggestion for including fog puzzles in a best of book, is to include a QR code linking to the puzzle

[@18mattd]

36:03 - very rare that I beat Simon's time! Excellent video and puzzle (as always!)

[@brawlstarstrio2524]

I did too! In 40 minutes!

[@Ardalambdion]

When I look for Evil Edna, I get a mad TV, microwave or whatever.

[@felixgranwehr]

Can someone tell me why the total of the first line cant be a negative number?

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

18:26 for me. fun fact: there is no way to disambiguate shaded or unshaded cells, so both assumptions are correct!

[@RichSmith77]

Apart from we're given r9c8 as shaded at the start.

[@HardTrue101]

Can't wait to see Cracking the Cryptic's Greatest Hits Volume 3. I do hope this time they take inconsideration views and likes unlike they did for the last volume. (There were some puzzles left out that had more likes and more views than any of the other ones that were "chosen" to go in the book. Made me wonder what the criteria was to get in the book.) I just hope it doesn't get political and run by the same people who decided Harry Potter had to be taken down from this channel.

[@awilliams1701]

R9C9 can't be blue. It could never get out. It says both orange and blue must connect

[@sh4dowchas3r]

How can you not remember The Moog from Will o'the Wisp?

[@stevesebzda570]

The plumbing nightmare that's going on in Simon's kitchen, he says. @2:35 or so: A "fatberg" or something was discovered, "Which he doesn't even want to know what it is." If you have a long front yard (the drainage pipe running the length under there to the sidewalk - it's a 30 or 45° angle from sidewalk to the main sewer line under the center of the road or something - "Whoosh" it goes). But if you have that "long front yard" (maybe 15° or 5° angle of the pipe all the way). Putting bacon grease (and even any kind of grease that will congeal) that grease is going to congeal along the way to the sidewalk/street). It's important for you folks to know this (if you are unknowingly putting grease down the kitchen sink that may congeal ). This is why my brother-in-law kept his hot water so hot (you had to be careful in the kitchen), he told me "The grease will harden as it goes to the street." Bacon grease and whatever put down that drain, is the cause . Don't do that (knowledge is power). They call it similar to an iceberg - but it's really just congealed (and VERY COLD like a block of ice). It's going to happen again (if you ignore this - you and your wife). Teach the kids, too. This is important (it's going to be their house someday). You're welcome. 😂🎉

[@erichvereen1988]

I love the logical progression that happens in fog of war puzzles. However, have been unable to play them in the iPhone sudoku pad app. The FoW does not seem to work in it. When it copies, it has the entire sudoku revealed with a square or two showing where the starting area is located. Just wondering if that is in the works. It works on the web based app though. Keep up the great work, Simon!

[@RoderickEtheria]

If you go to the settings of the app, is there not an option for fog of war? Under visual, make sure Puzzle Fog Animation is on.

[@erichvereen1988]

Unfortunately, the Apple app does not seem to have that setting.

[@ahiskali1]

Solved in 01:38:23, but made a few mistakes This is a rare puzzle where I didn't need Simon's help, yay Thank you gdc, and thanks Simon

[@stangerrits6712]

New challenge for Sven: update the UI a bit so that you can still clearly see the fog once you start coloring the grid.

[@DarrenNakamura]

Wow! I finished in 42:29. I saw the hour-plus video and was expecting a monster, but this flowed very easily for me. I never felt hopelessly stuck through the whole thing, but I was making interesting deductions throughout. Great puzzle!

[@andrewdipplecomedy]

For a puzzle with positives and negatives, I'm very disappointed at the lack of the use of the term "polarity" 😅 Amazing solve as always 👏🏼👏🏼

[@MyBigRed]

* knock knock* Who's there? Interrupting orange Interrupting orange w... ORANGE

[@Fronema1]

Is there some place on internet where hardcore sudokuers meet? I would for example like to read discussion between sudoku creators. Or just see where new idea for rules comes from. And also just to see where new sudokus drop :)

[@xerodeus2337]

I'm so glad I found this puzzle!!! It has my favorite constraints, yin/yang (shading) and fog! Lovely solve in 47 minutes

[@HunterJE]

I feel like setters have shown enough cleverness about how they show or don't show desired information that it's safe to assume if you can see it you're meant to be able to see it and use if useful...

[@SweetBlues23]

wonderful puzzle, but I couldnt for the life of me figure out which set of cells was gonna be positive and which was gonna negative, until I saw you mentioned the slight shading in r9c8. Luckily it wasnt needed to solve the puzzle 😆

[@victoriam6569]

Oh, I'm not the only one, hehe😅

[@gregs2284]

I think you're being ungenerous to assume any dislike for fog of war is because people just don't understand it. I have two reasons why I dislike them, one of which doesn't really bother me much but the other really bothers me. 1) The fog mechanism is a lot like the logic checker option. It gives you immediate feedback if you make a mistake. That might feel to people like they're getting help as they solve the puzzle. This doesn't bother me personally. 2) They're inherently fairly linear. They narrow the places to look to just the newly exposed area. That removes one of the main challenges of puzzles which is *finding* the right place to look. Just watching your videos I feel like they're less interesting because you never pause and never have to search, you're just constantly being led by the nose for each deduction. I exaggerate, the best FoW puzzles aren't that straightforward but they have to work hard to overcome that downside.

[@LednacekZ]

42:59 for me. the start was quite hard for me. it got easier once i got used to the rules.

[@AngrySanta]

Did you read all the monopoly comments about the puzzle hunt video yesterday? lol

[@dangrene617]

This was a longer video length that I usually attempt, but I just love Fog of War so much and think I've nearly solved every one on the channel, so I bookmarked this one to try at some point. Glad I finally did! What a joy to solve, and like so many FoW puzzles, the solution path felt pretty straightforward. 26:21 solve time!

[@Silvergrooves42]

This is so good! Absolutely amazed at how clever the deductions kept being.

[@AnnaVahtera]

Simon making a 127 pencilmark in a box with 1 already in it made me actually laugh out loud. :D

[@dannstarrjp]

As much as I love fog of war puzzles I have to admit I understand why some purist sudoku solvers might not be big fans. I think the main issue is the fact that you will sometimes enter a wrong digit by making a wrong deduction and the fog won’t clear. That immediately tells you it is a wrong digit which is something sudoku shouldn’t usually tell you right away. The point of all sudokus is they don’t tell you whether you entered the right digit or not until you solved the whole thing. I always feel slightly uncomfortable if that happens to me as I no longer know if I can call my solve clean after that, I did get a hint during the solve after all, something I didn’t deserve. It makes fog of war sudokus forcing you to „cheat” unless you manage to solve the whole thing without a single error.

[@dannstarrjp]

53:27 I dont know if that was deliberate because I didn’t spot that at all, just ran through numbers and figured it out that way. Sometimes it’s a better/faster way to spots something like r6c6 that Simon pondered for a minute if it could be a 3 instead of asking if it can be anything else (which it can’t) 😊

[@michaelawilliams]

I think specifying that the shaded squares must be ORANGE was a trick intended to make spotting the need for checking parity a little more challenging to spot. ;-)

[@stevesebzda570]

@6:19 Simon's twin with a cap on. It really, really could (I had to play it back to see if it was Simon skiing). It's not, it's a "twin" (not). 😂🎉🎉

[@chipsounder4633]

Fog of war puzzles in a book? Maybe you could use the silver stuff you find on scratchcards. Then when you know the digit logically, you can scratch off the silver to reveal

[@timbeaton5045]

In these fog of war puzzles where colouring is used, it would be advantageous to have teh fog cells renedered maybe as a checkeboard of small black and white squares, to distinguish them when they are coloured but uncleared. Always difficult to see the difference between a foggy /cleared cell with a coulour overlaid.

[@dicebar_]

During my solve my brain noticed that box 6 and 9 both wound up with 5 orange digits and 4 blue digits, and as a result my brain kept trying to make _all_ boxes adhere to parity logic to color boxes! It was fun to solve though ☺

[@EricHeimerman]

I solved this one without realizing that there was an initial "orange" square (on my monitor the color was too pale to be obvious). So it was not necessary to know which part of the yin yang was positive and which part was negative. I kept wondering how that part was going to be disambiguated, and then when I started watching the video, I face-palmed.

[@mrsawiggins]

I've been thinking for a couple of months now that I wanted to set a ying yang with your example pattern. Granted, I haven't done it yet because I've been writing books instead, but whatever.

[@Robertbroadway-d7c]

Enjoyed the puzzle. I think this in one of the only puzzles that clicked and I got to yell at Simon a little. I always like the puzzles you curate, though it takes me bit of time and a little help from the videos to solve. Just had to comment on the first time I beat you time, as strange as it may be. Cheers

[@fawful9992]

I solved this puzzle thinking that the orange squares were negative, but it actually didn't matter. As long as you know one set is positive and the other set is negative it doesn't matter which one is which for this puzzle, since the line values you end up with don't change.

[@flinty8121]

@49:30 reminds me of pixel hunting in old Point & Click Adventure Games. Great eyes btw & great solve. I was fortunate enough to get to test this one for gdc. :)

[@thomasstuder1624]

I love fog of war puzzles. Proportionately, I am better at these than normal Sudokus. The fog limits where I have to look and so I lose less time on trying to deduce things in dead ends.

[@robinzieltjens7139]

I personally dont really like fog of war, I understand the ruleset, but its forced lineair solving pattern just doesnt interest me as much. I much more prefer logic where you can see the grid but you have to make your own start in understanding the setting.

[@EmonEconomist]

Finished in 28:33. I enjoyed this a lot! Not too difficult with the weird negative maths, and the fog helped keep me on track without getting overwhelmed by the whole grid at once.

[@victorfinberg8595]

maverick ... flying what sounds like a small plane ... in the snow? brave lad.

[@BrianWenger]

Woah I actually solved it! Just a little bit of help from Simon at the beginning to figure out the perimeter shading, but after that it was smooth and awesome. Just at 49 minutes.

[@mery1973able]

17:50 - How is it possible that Simon cant immediately see the basic principle of jinjang? He has solved tons of them! It is weird....

[@Hakucho64]

Super enjoyable puzzle, the way it flicked back and forth between different kinds of logic. 01:20:01 for me with no help.

[@urumomaos2478]

Wouldn't the same logic work if orange is negative? Since (-4) + (-4) = (-8) ? 12:51

[@skydnir]

81 minutes for me, but it felt very aproachable, I was never stuck, just slow;) thanks for the puzzle.

[@aspinninggreycube1270]

57 seconds for me on this one. It seemed like a lot longer, but I've never seen the timer glitch before, so I guess that must be right.

[@Kinada]

76min, not too shabby considering I'm kinda bad at shading puzzles.

[@phuybrechts6875]

This could not be a digits value 10 😁 , remember the 4 by 4 puzzle from this week , it counts to 30 🤪

[@Swisswavey]

Nice puzzle. 45 minutes here. Thanks for sharing it.

[@metleon]

I think you maybe could do fog of war on paper if you make the fog that stuff they put on gift cards and scratch off tickets to hide the numbers.

[@annemarijt2858]

Loved this one! It took me about 2 hours and I had to take a little peak at Simon a couple of times for a clue, but I enjoyed it a lot! :)

[@CauchyIntegralFormula]

26m04s. That was really cute! My first time dealing with these "zippers", it's an interesting concept, especially with the negatives

[@srwapo]

The negatives scared me! I'm "okay" at zippers, but the negatives basically doubled the number of digits to consider.

[@psiphiorg]

My time for this puzzle was 26:14, solver number 7322.

[@heywingliu9085]

29:04 for me! Pretty straight forward logic but interesting piece

[@robertcotton8481]

Next puzzle will be positive negative doubles triple and halfs