Find Harmony In Fog Sudoku!

[@gdc42]

Thanks for that feature! Scojo challenged some setters to create puzzles with doublers and yin yang a few weeks ago and this was my contribution. There were lots of interesting puzzles among them. Of course I couldn't help myself and added fog to the mix :D

[@emahalingam1934]

Fun Foggy Feature Friend!

[@pouletbelette]

Probably my favorite puzzle from you, gdc. Great job!

[@patu187]

For the first time in my life, I solved a sudoku from your channel without going back for some guidance! I'm going to bake a cake 🎉

[@Daymickey]

Congrats!

[@flabort]

Chocolate cake?

[@katiekawaii]

👏👏👏

[@Wikihan]

Wow wow! Not the easiest one to tackle without guidance!

[@marcovanderhorst7486]

Simon hopes a chocolate cake😊

[@KeithGrant]

at 51:55 "Let's have a look at the shading" Simon shades the colors backwards for r67c3 while hypotheticing a 1 in r6c2. However it still breaks because you end up with a shaded 2 in r6c2 and an un-shaded 1 and 3 on the arrow (r7c2 and r8c3) -- meaning unshaded cells all the way around r8c2 which isolated the shaded cell

[@jasond4084]

That whole sequence seemed painfully obvious. Even before the color blunder. After 4 was determined to be in b7 c1, 2 could never be placed in r6 c2 as a single or a double. Sometimes I wish I could whisper through time and space into Simon’s ear but only yelling works. 😂😂😂

[@simonl4523]

I often think if I could just sit in a chair next to Simon, and whisper little suggestions from time to time, his solve time would drop a few minutes with every episode.

[@thebushmaster0544]

42:11 "i'm less unconvinced that isn't what's required here" LMAOOO beautiful

[@laslo67]

Technically correct grammar "...I'm less unconvinced that that isn't what's required..." Love it. 🤣

[@Paolo_De_Leva]

Everything was unexpected, starting from 30 unshaded cells along the perimeter. This construction was definitely fine tuned to perfection. 👏👏👏👏👏👏👏👏👏👏👏👏👏👏👏

[@josephbentley1300]

29:12 for me, love these Fog sudokus. I tend to get lost in complex puzzles with even finding where to start looking for the break-in, whereas fog sudokus are more or less just solving a bunch of small break-ins, knowing almost exactly where they are. I think that's what makes these so satisfying.

[@chocolateboy300]

I finished in 58:08 minutes. This was one of the most incredible fog of wars I have done. The doubler and Yin Yang rules work really well in fog of war. I was even able to get the border before I put any digit in, which felt strange but cool. It was so fun to keep getting 9 as a doubler value, especially the arrow clue in the top left. As fun as those were, they pale in comparison to my favorite part. I felt as if the whole construction led to this moment, which is insane to think it is on purpose. It is getting a 12 pair in r6c2&3. Figuring out that the 1 was doubled with an unshaded 2 was easy. The insane part comes from always proving that a 1 exists on the 2 clue and exactly in row 7. This allows a snipe on the digit in r7c7, which feels like it comes out of nowhere. The way I saw it was asking if 2 could be a double 1 pair. This creates a diagonal shape of unshaded, locking in the shaded cell in r8c2. That was already amazing to see. This meant both 12 were doubled. Trying the same thing again with the doubled 2 on the inside leads to the same problem if you diagonal it again. This forces it to head right where a 1 is always in row 7. That was incredibly construction and one of the sickest things I have seen. This puzzle has to be one of my favorites. Great Puzzle!

[@lyraparry3321]

That's incredible!! I got the r7c7 single after deducing that the 2 couldn't be in c2 for exactly the diagonal trapping reason you just described, which allowed me to place it in c3 and actually see the arrow. XD I can't believe I missed the fact that of course moving the diagonal trap over by a block wouldn't stop it from trapping the shaded cell! I think my favourite bit in my solve was the deduction of the 8 in box 6. I'd deduced r7c7, and then I worked out that I couldn't use 7 on the end of the arrow because that would put an impossible 8 in the circle, which left me a 345 triple in r5c7, r6c7, r6c8. That left the last digit remaining to be placed in the box as 8, which immediately disambiguated the 348/58 arrow in boxes 5/8. I loved that so much.

[@olivier2553]

I can't believe I made it. 46:01 for the sudoku, a bit longer to finish the shading. And I think I only made 3 errors (putting a digit that did not reveal the expected fog, Once in R3C1 and twice in R7C5) and forgot about the change of colour on the perimeter. I thought I was at a blockage, that I would never finish the puzzle by myself and started watching Simon. I was at the exact same stage when Simon mentioned about the colour of the perimeter and I decided to give it another try. Thanks Simon gdc and Sven.

[@stephenmarseille5425]

Simon, at 52:00 you've miscolored your hypothetical (the one at r6c3 should be orange, the 2 below it should be blue), this undoes your checkerboard logic, which means you got lucky at 53:00 with the reveal of the 2 in r7c2. You likely would have resolved it anyway as the only way to make it work would have left the orange at r8c2 stranded, but still.

[@innnak1]

I'm sorry, the sudoku solving hasn't even started but I must comment: "I used to buy buckets of cookies" might be my personal favourite of all the things I've ever heard on this channel, especially since it was presented in such a positive light. I'm turning 35 in a few weeks time and it is becoming more evident by the day how ruthless time really is. If you are in your twenties, please, do eat buckets of cookies. The time to do so and get away with it will be over sooner than you'd ever guess.

[@stuartmckinnon9190]

Kind of a weird comment haha

[@Anne_Mahoney]

Yeah, but it may come back: I'm in my 60s and am once again able to eat buckets of cookies without ill effects. Not that I do it *very* often, you understand. 😸🍪🍪🍪

[@glum_hippo]

“I’m less unconvinced that that isn’t what’s required here.” 😂

[@studgerbil9081]

words to live by.

[@girlfromthedwarf]

I feel another T shirt coming on...

[@A_CC_K]

Fog of war, my favourite puzzle type. Last night's stream was amazing, sadly I missed the last 30 minutes as I fell asleep. It was a brilliant way to end a hard day watching Simon and Mark solving puzzles.

[@emdiar6588]

For me it's a toss up between FOW and Rat Maze. Combinations of both rule sets are heaven.

[@A_CC_K]

@emdiar6588 100% agree with you

[@btuftin]

Managed to solve it in just under an hour, but I had at least three instances of "This must be correct! Wait, that should have cleared fog!" My logic was of course off, but I followed the rules and derived the correct logic before proceeding.

[@penningmeestercgkdelft9159]

56:52 for me. After a quick start I got stuck half-way for quite a long time (with the circled 12 pair in box 4), but eventually I found the correct logical path without help from the video. Very satisfying! Many thanks, gdc :-) It is so enjoyable to see Simon follow almost the same path I used, also spending a lot of time on pencilmarking the 3-4-5 arrow in the middle, before the breakthrough with the circles 12 pair occurs...

[@tomgalli1188]

42:28. Loved it!!!

[@mikepictor]

Took me about 70 minutes, but I was captivated. So many astonishing insights and moments of revelation. Such a cool construction.

[@Aliessil]

Finished in 35:56. Said it before and I'll say it again - I love fog puzzles! 🙂 I've concluded that for me to beat Simon's times, I have to use his weaknesses against him - pencilmarks and sudoku!!! 🤣 ( ... and even then, it's rare)

[@bertbergers9171]

Thank you for the video Simon and puzzle gdc! Finished in 68 minutes just a bit slower then Simon. It was tough but doable

[@roccov3614]

I really enjoyed that. Yin Yang and fog go well together.

[@GoldenredDragon]

I couldn't find that first digit on the last arrow, because, surprise surprise, it was just sudoku... The moment you explained it I was relieved and managed to finihs my own solve! Beautiful puzzle, thank you for the amazing content, as always.

[@margaritashcheglova8670]

Double perfection ❤❤ and the perfect harmony between the setter and the solver!

[@derekrocco4344]

I loved this one! I must have been absolutely in the zone - finished in 21:08!

[@Rubrickety]

42:10: "I'm less unconvinced that that isn't what's required here." That sentence is a pretty good puzzle itself!

[@srwapo]

44:21, SUPER liked the break in, felt really slow in the final 1/3. The arrow with the circle in r7c5 really beat me up.

[@wokkawicca]

1:06 Putting a 1 in a circle AND a 9 on an arrow...1-cell arrows in the same box...good times.

[@Coyotek4]

30:25 ... I love 'fog' sudokus Nice puzzle!

[@jurgenbaumann67]

Nice. Specially the beginning. In 14:20 he explains the special of Ying-Yang and in 22:15 he forgot it already and thinks about R4C9 is orange or blue - even he has already two blue squares and a ornage between it, so no color change is possible anymore at the outer ring.

[@novelhawk]

31:00 how did you deduce that the circle in r4c3 is not connected to r4c2-r3c1-... ?

[@spudd86]

I don't think he did...

[@jonhansen9622]

Yeah, I am confused about that, also

[@dmb-zw8nn]

He didn't prove it, but the only way it could connect would result in the circle being a 9, which it couldn't be.

[@gdc42]

​@@dmb-zw8nn yes, that is the point. I put that arrow there intentionally to look like it's going to connect and then end up as a short stubby one :D. I think Simon saw that this breaks but just did not verbalize it.

[@ingiford175]

He did not, but the given 9 that showed up in box 6 would have pushed the circle square to down to r5 since it needed to be a circled 9

[@Ardalambdion]

Winter has definitely come to Britain and Scandinavia, perfect day to add some fog to it too...

[@longwaytotipperary]

A lot of rain today in SE USA!

[@GregJonson]

37 : 39 for me and I'm quite proud of that! Moderately difficult but fun all the way through. Plus I love coloring!

[@tatikorovkina]

It amazes me how Simon sometimes comes to the right conclusions based on a wrong logic path. No judgment, we all make mistakes, most of us probably much more often than Simon. I'm wondering though if there are any videos that's never seen the light of day because it actually didn't work... It would be so exciting to see!

[@0800Timobile]

Got lucky around minute 52 I think, by swapping the colours around. But I was stuck there too (still am)

[@RockyInSea74]

I think I got it. If R6C3 is the doubled 1, then there is no way to make R6C2 a 2 without doubling it. So, R6C2 is doubled if it is the 1 or the 2. Now if it is double 2, then you can't do double 1 below it and add 2, because the 2 will already be used by the 1 arrow next to it. So the digit right below it would have to be undoubled. It can't be a 4 and if you do a 1/3 pair undoubled, it would have to surround the doubled digit in R8C2 with undoubled squares. So, there is no way to get R6C2 to be a doubled 2 and is thus a doubled 1 with the 2 below.

[@maspleben]

Yes I agree with you Simon got lost in his logic there and we did not get a proper answer on why it could only be 2 in the left circle. I think he should revisit that logic. Because I got lucky too I have to say, but this is the only thing that can move the solving forward at that point, by revealing the longer arrow for the right circle. So it must be 2 in the left circle, but the logic of Simon was not satisfying.

[@craigyoung8008]

I find it particularly amusing 22:05 that despite Simon diligently explaining the yin-yang techniques a few minutes earlier, he calculates whether r4c9 can be doubled. Instead of simply filling the perimeter from r3c9 to r1c6 in blue. And then he still goes on to solve the entire puzzle quicker than me. 😖

[@praematura]

Surprised I made it through this one without help, finishing in 29:47 (conflict checker off), as there were several times I nearly broke it and was unsure how to proceed. 😅 Many thanks to gdc for an amazing puzzle!

[@Kairamek]

"This can't be a three four to make seven." No. It's a three four make 10. :D I really like the start. Forcing large digits to clear a third of the fog right away is different than most Fog puzzles approach of creeping crossing the grid. I'm a little annoyed with myself. For 20 minutes I was convinced the square R6 C2 to R7 C3 was going to be a pair of twos and a pair of doubled ones. A deadly pattern resolved by the shading. Simon immediately noticed that would make a checkerboard. Doh!

[@davidhughes7174]

Thnk you Simon, another enjoyable solve.

[@benmason9341]

Another way to solve the 1/2 bulbs - the 2 arrow in R6C2/3 can’t be blue with one and one on it diagonally because it would pen in the orange cell in R8C2, which forces both circles to be orange!

[@scarletmanuka6170]

Beautiful puzzle. Took me 80 minutes but I got there. I think the funniest moment was finding a 12 pair in arrow circles in box 4, and then it was surprisingly difficult to prove that the 2 did eventually have to be doubled. (The 48 one-cell arrow was pretty funny too!)

[@eddieharwood7788]

An enjoyable and challenging puzzle - took me a looong time.

[@AWanderingSwordsman]

47:31 for me. Was a fun one. I love fog.

[@Gonzalo_Garcia_]

19:29 for me. What a great puzzle, really loved this one!!

[@ericpraline1302]

Good one, thanks. I did get stuck at one point but mostly pretty smooth.

[@kosumi68]

Smooth solve, apart from the 12 trickery... I got that right for the wrong reason. Fog of war is a real cushion at times, likely contributing to its popularity. :-)

[@roccov3614]

32:28 Exactly what I thought. Just like a black kropky dor.

[@penningmeestercgkdelft9159]

24:11 "The world is going to be golden... or at least slightly more orange": that sounds like music to a Dutchman 😀

[@ike7351]

I think the deduction at 31:22 is wrong because if R1C1 and R3C1 are a 12 pair, and R4C2 is a 1, you can make the circle in R4C3 a doubled 8 and the arrow (with the doubled 6) adds up to 16 If I am wrong someone please let me know, but as of now I don’t fully understand how Simon’s way is the only way

[@gdc42]

Row 4 already contains a 1 and a 2. So whatever digit in row 4 is taken, it's at least an undoubled 3 which it has to be.

[@awilliams1701]

My favorite fog puzzles are sandra and nala. I was happy to see her on the app, but it was sad that they weren't the nala is doing xyz find her toys, shoes, etc.... puzzles. lol

[@jayclarke3142]

Great solve

[@longwaytotipperary]

❤ foggy puzzles!

[@RhiannonAgutter]

42:24 for a palindromic finish for me. This was a fun one!

[@benjaminrealy5661]

46:48. Would have been way quicker had I realized the 2 loved between box5 and 8 didn't have to both be 12. It rook me forever to realize the one line could go another digit but still add up to a doubled 2. I was like there was no way to have all shaded and unshaded connect without a lone shaded not connecting in box 3 or 4

[@WafflesTaster]

36:06 for me, first time solving faster than the video :) It was so much fun

[@wanderlustwarrior]

34:24 for me. That was very fun!

[@Tringard]

I was really tickled with the logic around the pair of circles in the bottom of box 4

[@461weavile]

Ah, I think I was confused by "Arrows don't overlap" and not considering that two arrows terminating in the same cell would constitute an overlap.

[@TheFansOfFiction]

Solved! 74:34 I got stuck on that last line

[@inspiringsand123]

Rules: 07:34 Let's Get Cracking: 10:33 What about this video's Top Tier Simarkisms?! Bobbins: 1x (47:28) The Secret: 1x (12:35) And how about this video's Simarkisms?! Checkerboard: 12x (12:48, 13:20, 38:44, 41:46, 42:08, 43:37, 52:10, 52:15, 52:55, 54:21, 54:29, 57:45) By Sudoku: 10x (25:43, 27:03, 28:12, 28:31, 37:04, 40:31, 51:21, 59:23, 1:01:49) Hang On: 10x (18:46, 22:45, 22:45, 26:24, 29:10, 33:30, 47:06, 47:06, 58:14) Cake!: 8x (04:01, 04:05, 04:34, 05:33, 05:40, 06:02, 06:09, 07:21) Clever: 7x (22:49, 28:31, 53:52, 1:03:43, 1:04:42, 1:04:45, 1:04:55) Sorry: 6x (03:53, 05:18, 23:05, 32:13, 34:08, 52:10) In Fact: 6x (12:31, 13:29, 16:54, 22:22, 27:37, 55:52) Ah: 6x (34:21, 59:23, 59:48, 59:48, 1:00:41, 1:00:41) Nonsense: 4x (19:00, 19:02, 52:13, 1:03:01) Obviously: 4x (22:34, 35:56, 44:27, 51:05) Lovely: 3x (19:24, 42:24, 1:00:58) Fabulous: 3x (01:13, 01:15, 06:09) Good Grief: 2x (18:42, 37:29) Naked Single: 2x (59:55, 1:02:47) Brilliant: 2x (00:36, 05:27) Incredible: 2x (02:20, 02:36) Wow: 2x (59:45, 1:04:18) The Answer is: 1x (14:05) I Have no Clue: 1x (55:03) Beautiful: 1x (28:24) Fascinating: 1x (1:04:55) Gorgeous: 1x (46:49) Hypothecate: 1x (52:27) Famous Last Words: 1x (1:04:22) I Digress: 1x (06:49) Which Means What?: 1x (11:04) What Does This Mean?: 1x (37:23) Pencil Mark/mark: 1x (44:13) Triangular Number: 1x (10:55) Weird: 1x (18:57) Most popular number(>9), digit and colour this video: Fifteen (9 mentions) One (95 mentions) Orange (84 mentions) Antithesis Battles: Even (10) - Odd (5) Shaded (5) - Unshaded (2) Black (2) - White (0) Column (8) - Row (2) 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!

[@kolyn003]

@@inspiringsand123 damn, you're really "watching" 😂

[@pairot01]

35:12 for me, it took me a while to make some of the yin yang deductions, kept not looking in the right spots.

[@Kirbyfan87827]

Finished in 20:16 with help from the video.

[@sjm6280]

I assume Simon not tipsy after 188 sips of wine in between puzzles means yesterday they didn't get to the end

[@ingvarsuigin609]

Around 31:00 can someone tell me why it can't be a zigzag 4-cell arrow going to the visible circle, made out of 2-double 6-1-3 = double 8?

[@nimiugn]

24m49s for me. Nice one!

[@Kradlum]

@30:50 why can't the circle in R4 C3 be the circle for the arrow in box 1?

[@HunterJE]

That would need at least an 18 value (note the 1 and 2 already used in row 4), but 9 is ruled out of that circle by sudoku

[@Kradlum]

@@HunterJE Aha! Thank you.

[@lexihopes]

Because the minimum is r1c1 = 2, r2c2= 12, r3c1= 1, r4c2 = 3 totaling 18, and there's already a 9 in column 3 so it can't be a doubled 9.

[@pairot01]

because the line would be too long, the 9 in the row has already been used!

[@piarittersporn]

Very bsautiful puzzle.

[@grahamania]

00:46:32 for me. Great puzzle! Kind comment.

[@JustLookingHere]

Finished it but made a few wrong assumptions. Only finished it because the fog didn't disappear and had to think about why it was wrong. I hadn't utilised all possible ways the arrow could go because of the double value.

[@user-sv7bx6gn8n9]

33:54 for me. I like this puzzle.

[@RoderickEtheria]

22:22, doesn't Simon know anything about Yin-Yang? 23:11, oh, good, he does.

[@danicatempleton6745]

45:05 woohoo!

[@andremouss2536]

30:50 Why cannot the circle R4C3 be an orange eight, connected to the upper left arrow by two blue ones ?

[@gdc42]

There is already a 1 in row 4

[@mudscuffer]

52:34 for me. Got a bit stuck before I found my way through.

[@valeryolympia]

61:38 for me! great puzzle

[@ChicanoryIsMyName]

Ugh, I made a lot of mistakes, but I managed to correct them . Nice puzzle

[@darthrainbows]

Nice, solved in 65:03

[@sealed2mybff]

Did Simon see the sudoku that Mark played that had Simon's example shading?

[@LednacekZ]

33:24 for me. a tough combination of rules.

[@ewenfraser883]

Is there any reason why the arrow in box 3 can’t turn 90 degrees and go to r4c8 instead of r4c9? In other words do arrows only turn at cell centers? If so that must be specifically stated in the rules

[@RichSmith77]

I guess it's an unstated rule that arrow line segments go in straight lines between cell centres. Maybe you're right, that ought to be stated, but it never is. This could be said about many other puzzles too. This one follows the established convention.

[@Jim_Fries]

I still don’t see a CTC Fog of war app on the apple iTunes Store, am I missing something?

[@RichSmith77]

It's a pack that you purchase from within the standard CtC app, if you update that app to the latest version. (They confusingly refer to it as a new app. It isn't.)

[@Jim_Fries]

@ thank you so much!! I’ll check it out right now, I have all the apps on my phone.

[@Jim_Fries]

@ found and purchased!

[@artyheartylife8588]

Might you please try using yellow for unshaded (no shade = yes sunshine) and purple or blue for shaded (shady places often have a blue or purple tinge).

[@RichSmith77]

Hi, fellow yellow/blue solver! 🙂. Pastel shades make the pencilmarks nice and easy to see, too.

[@kevinmartin7760]

Starting around 51:55, isn't he using a nonsense coloring to disprove that R6C3 is a 1? Shouldn't R6C3 be orange (doubled) and R7C3 blue (natural) with a 1-element arrow? Then R6C2 can be an orange (doubled) 2 and R7C2 a blue (natural) 1, with the arrow picking up a natural 3 in R7C3? The actual reason it can't is that this creates an isolated shaded cell in R8C2.

[@Jim_Fries]

25:52 That’s what she said.

[@sorellla]

When I go to the fog of war pack in the cracking rhe cryptic app, it shows me no puzzles and a message saying "new pazzle coming soon". Anybody else having this issue?

[@SqueakSqueakleton]

So if that's 9 in the corner, does it exponentially help 3 lose its religion?

[@SkillZgetKillZ]

got it at 61:53

[@johnh2052]

Something weird happened with this one. I solved without help in less than 24 minutes. It all flowed pretty obviously. Everything seemed pretty forced. I'm not sure I've ever finished one faster than Simon before, let alone this much faster. Did Simon miss something obvious and strange? Maybe a lack of pencil-marking made something more difficult and "missable?" Perplexed... I'll have to watch the video to see... PS I've concluded that it's just all the extra explanation that Simon does.

[@emdiar6588]

Orange is the colour you use for odd, but all the values in shaded areas are even. This bothers me.

[@titusadduxas]

That’s very annoying. I’d have done this in under an hour but I kept thinking the arrow ending in R5C6 added up to 19!!!

[@chiderakalaji7206]

❤❤

[@kwongshuchung]

58:46 for me as #2913 solver

[@TurquoizeGoldscraper]

34:30 for me.

[@agoristtaxadvice]

Maybe I missed it- why can't the arrow in r1/c1, r2/c2, r3/c1 have it's bulb in r4c3 at around 31 minutes? I mean, you can pretty quickly figure out r3/c1 has to be 1, which shows it's not, but I think he just made a lucky guess?

[@BryanLu0]

30:44 with some help from the video