The Best Fog Of War Sudoku Puzzle Of Them All?

Рет қаралды 51,409

Күн бұрын

** TODAY'S PUZZLE **
When Simon warned constructors not to even consider using negative numbers on Zipper Lines, gdc recognised a challenge! This fusion of Zipper logic, Fog Of War sudoku, Yin Yang and negative numbers adds up to one of the very best Fog Of War sudokus ever. The inventiveness and sheer beauty of this one are epic.
Play the puzzle at the following link:
sudokupad.app/iql7m9a36u
Rules:
Normal sudoku rules apply. The grid is covered in fog. Placing a correct digit will clear the fog from the surrounding cells. Values of the pair of cells with an equal distance to the circled centre of a lavender line sum to the value in that central cell. Shade some cells orange such that all shaded cells are orthogonally connected and all unshaded cells are orthogonally connected. No 2x2 area may be fully shaded or fully unshaded. The value of a shaded cell is its digit. The value of an unshaded cell is zero minus its digit (a negative number).
You can watch us in the latest @numberphile video here:
• A Sudoku Secret to Blo...
If you'd like to see Simon's solve of TotallyNormalCat's Broken Secrets on the main channel, drop a comment and let us know.
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▶ Contents Of This Video ◀
0:00 Theme music & Puzzle intro
2:16 Kitchen Nightmares!
2:58 CtC Greatest Hits Volume 2 Deliveries
3:34 Simon's 2.5hour solve of Roller Coaster Nurikabe
4:09 Happy Birthdays
7:35 Rules
11:44 Start of Solve: Let's Get Cracking
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Пікірлер: 294

@MrGrog90 5 ай бұрын

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 5 ай бұрын

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 5 ай бұрын

@@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 5 ай бұрын

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

@David_K_Booth 5 ай бұрын

It's a very engaging puzzle. Well done!

@achad1607 5 ай бұрын

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

@Itstoearly 5 ай бұрын

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!

@patrickgass787 5 ай бұрын

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 5 ай бұрын

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

@inspiringsand123 5 ай бұрын

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!

@TheClawNinja 5 ай бұрын

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

@PleegWat 5 ай бұрын

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 5 ай бұрын

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.

@spencerss4908 5 ай бұрын

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:)

@Paolo_De_Leva 5 ай бұрын

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 5 ай бұрын

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 5 ай бұрын

@@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.

@martysears 5 ай бұрын

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

@emilywilliams3237 5 ай бұрын

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

@jasperb7890 5 ай бұрын

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

@rsshysh 5 ай бұрын

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 5 ай бұрын

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 5 ай бұрын

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 5 ай бұрын

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 5 ай бұрын

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.

@AndrewYakovenko 5 ай бұрын

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 5 ай бұрын

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

@TurquoizeGoldscraper 5 ай бұрын

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 5 ай бұрын

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 5 ай бұрын

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 5 ай бұрын

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

@maljamin 5 ай бұрын

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 5 ай бұрын

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

@jonhansen9622 5 ай бұрын

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

@johnpauladamovsky86 5 ай бұрын

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

@brianshilling 5 ай бұрын

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

@Ardalambdion 5 ай бұрын

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

@StephenMarkTurner 5 ай бұрын

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

@ingiford175 5 ай бұрын

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 5 ай бұрын

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.

@OrcWoodworks 5 ай бұрын

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

@masonklepp5651 5 ай бұрын

Thank you for highlighting this truly joyous puzzle! This was one of my all-time favorites

@VinnyF3 5 ай бұрын

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

@trailblazer225 5 ай бұрын

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 5 ай бұрын

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.

@Silvergrooves42 5 ай бұрын

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

@ademjaziri7692 5 ай бұрын

This was lots of fun! Thanks gdc and Simon

@Vedvart1 5 ай бұрын

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 5 ай бұрын

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 5 ай бұрын

@@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 5 ай бұрын

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 5 ай бұрын

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

@victoriam6569 5 ай бұрын

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 😅

@petemurfey8219 4 ай бұрын

Loved it, and I beat Simon's time by a few minutes! Best of Sudoku, Vol. 3

@18mattd 5 ай бұрын

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

@brawlstarstrio2524 5 ай бұрын

I did too! In 40 minutes!

@annemarijt2858 5 ай бұрын

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! :)

@libbilation 5 ай бұрын

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

@BakingFiend-rl7mo 5 ай бұрын

Thanks for another great showing of a fog of war! Can't wait to watch it

@Zardoz37 5 ай бұрын

Another great puzzle from gdc! I had a lot of fun solving this. The choice to combine yin-yang with positive-negative is beautifully thematic.

@AnnaVahtera 5 ай бұрын

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

@stevieinselby 5 ай бұрын

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 😜

@gatlygat 5 ай бұрын

Maaaaggg-nificent!!! Big ups to gdc , Simon and all of you awesome people!

@quatarsr6217 5 ай бұрын

Very satisfying to solve this. That the negatives nearly reverse all the rules we know about zippers is awesome. Well done!

@BrianWenger 5 ай бұрын

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.

@dangrene617 4 ай бұрын

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!

@eddieharwood7788 5 ай бұрын

That was just superb. Not radically difficult, but I had a smile on my face throughout. 70 mins for me.

@thomasstuder1624 5 ай бұрын

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.

@markmajkowski9545 5 ай бұрын

Shockingly straightforward for FOW with the shading rules. Best chance to beat Simon!

@elay127 5 ай бұрын

This was my first time ever trying the puzzle before watching your video (and also my first time doing a full variant sudoku puzzle) and it was even more interesting to watch you after trying my own approach to it.

@s.w.4534 5 ай бұрын

that was just incredible, thanks for this awesome Puzzle :)

@YellowBunny 5 ай бұрын

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.

@HalfBakedLunatic 5 ай бұрын

Absolutely amazing! Great puzzle and a stunningly good solution path. Well done.

@kennetsdad 5 ай бұрын

Zipper lines are quickly becoming one of the most versatile constraints; there's so much potential.

@Swisswavey 5 ай бұрын

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

@frankjiang1857 5 ай бұрын

Finished in 33:41. What absolutely lovely logic to go from one step to the next. I loved the mix of switching from figuring out what possible digits could be where on the zipper lines to transitioning to make sure that the shaded cells couldn't form a 2x2 to figuring out which shaded cells were connected to going back to figuring what was on the zipper line. Very fun puzzle!

@ericpraline1302 5 ай бұрын

Lovely puzzle, thanks, and a much smoother solve than I was anticipating when I saw the word "negative".

@anaayoung9142 5 ай бұрын

Did not dare to try. But your solve was amazing to this clever and beaufiful puzzle. The fog just make it better! Thanks for it 😊

@EmonEconomist 3 ай бұрын

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.

@piarittersporn 5 ай бұрын

Wonderful puzzle and not as difficult as I expected.

@DarrenNakamura 5 ай бұрын

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!

@anjaschneider5904 5 ай бұрын

I really loved this one! ❤

@AlphaNumericNZ0 5 ай бұрын

Fun puzzle. Thought it flowed very well.

@victorfinberg8595 5 ай бұрын

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

@dollarsing 5 ай бұрын

"Grid furniture" LOL

@ahiskali1 5 ай бұрын

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

@theadjectiveform 5 ай бұрын

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.)

@Coldheart322 5 ай бұрын

Took me a while to finish this, mainly as I was doing it between work. But really loved the solve.

@andrewdipplecomedy 5 ай бұрын

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 👏🏼👏🏼

@MarushiaDark316 5 ай бұрын

We've since had Schroedinger cells, doublers, halvers, multipliers, fog of war with zero shown cells, and now negative numbers. Basiaclly, anytime Simon says, "Setters, don't even think about it" or "This violates the rules of Sudoku," the setters find a way to make it happen.

@JasperJanssen 5 ай бұрын

“ 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.

@Jalo1138 5 ай бұрын

I had a ton of fun doing this one! It’s been too long since I tried one before watching Simon’s solve. 88.02!

@debrabowen4276 5 ай бұрын

I received my books today! So nice!

@user-rf2hh2wr8u 5 ай бұрын

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

@skydnir 5 ай бұрын

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

@michaelawilliams 5 ай бұрын

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. ;-)

@hungryhangman250 5 ай бұрын

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

@victorfinberg8595 5 ай бұрын

don't worry, simon. i'm sure some setter will be making a fractional sudoku for you soon

@tylerowens 5 ай бұрын

55:54 rare that I beat Simon's time, even with the handicap of him explaining it to us. Very well constructed puzzle. A blast from start to finish.

@MyBigRed 5 ай бұрын

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

@evanbasnaw 5 ай бұрын

I git my book yesterday and I finished the Fog of War book tonight. One thing I will say about the fog of war is that it conditions you to get instantaneous feedback that youve entered a correct digit, you just don't get that with normap sudoku so it feels like you're missing something.

@stangerrits6712 5 ай бұрын

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

@yanturgeon1384 5 ай бұрын

I always skip the intro but ill say Happy birthday every time I watch a video so yeah Happy birthday every one it is

@y2a1979 5 ай бұрын

As a child in Canada in the 80's, we had several channels that aired British shows, mostly cartoons. Among them, Willow the Wisp. :D

@ShakalDraconis 5 ай бұрын

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.

@Orenotter 5 ай бұрын

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 5 ай бұрын

I enjoyed that bit of poetry, thanks for sharing!

@flinty8121 5 ай бұрын

@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. :)

@dicebar_ 5 ай бұрын

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 ☺

@CauchyIntegralFormula 5 ай бұрын

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

@srwapo 5 ай бұрын

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

@zaclewis1869 5 ай бұрын

I finally figured out something quicker than Simon. I had that first box figured out in about 5 minutes. I just went through the iterations of the numbers real quick. I don't have Simon's vast knowledge of puzzles, so I didn't get bogged down thinking about parity and whatnot. I also didn't waste time figuring out how r8c9 could be orange while r9c9 was blue, which was never possible.

@timbeaton5045 5 ай бұрын

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.

@dannstarrjp 5 ай бұрын

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.

@GeechGoblin 5 ай бұрын

Another excellent solve! I can think of a way to sort of include fog of war puzzles in the next Greatest Hits volume: Include a page or two with the name and descriptions of the puzzles with QR codes linking to a site that hosts the puzzles.

@chipsounder4633 5 ай бұрын

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

@F1r1at 5 ай бұрын

Finally! Somebody did it, negative numbers in sudoku, so Simon couldn't say anymore "You can't put negative numbers in sudoku" 😁 Nice puzzle, 53:28 for me, but I've made some mistakes, last yin yang puzzle on this channel was a while ago, almost forgot how to solve them)

@ServantOfSatania 5 ай бұрын

24:11 For me, very fun logic, I liked the way line between box 5 and 8 interacted with the coloring once you get to it

@fawful9992 5 ай бұрын

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.

@_-_-Sipita-_-_ 5 ай бұрын

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

@RichSmith77 5 ай бұрын

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

@markp7262 5 ай бұрын

33:10 finish. I had a bit of a false start, screwing up my addition on the line along column 9. But once I rewound and rethought for a minute, I was able to push through and follow the logic. Yin Yang and math, an excellent combination. Fun fun fun puzzle!

@Sponsie1000 5 ай бұрын

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 :]

@Hakucho64 5 ай бұрын

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

@Yttria 5 ай бұрын

Great puzzle! Got stuck on the column 9 zipper because of an incorrect math error. Smooth sailing once the mistake was resolved.

@welcometogeektown 5 ай бұрын

I needed a little help to get me started, but once I got to 25:21 in the video, I was able to take it the rest of the way myself. Usually I get stuck on the harder ones and only finish the solve with about 10 minutes left in the video, so I'm really happy getting there with still 1/2 hour left...

@zealot2147 5 ай бұрын

40:36, it really helps that the shading doesn’t matter outside showing +/- parity, I was really concerned at first in how little we had but just that flowed really well box to box