THIS Actually Makes Learning Maths FUN

[@MrGrog90]

gdc here. So happy to see my puzzle solved here! Thanks Jaze for inventing this ruleset and thanks VikingPrime for the feedback on smoothing out the solve path (spoilers ahead).The intended solve path uses modular math to resolve box 5 - really impressive how quickly and accurately simon captured that.

[@trisha2584]

lovely flow to this puzzle

[@st3phgr1ce]

Simon’s ability to break into puzzles is awe inspiring ❤

[@walrusahoy5878]

This was magnificent. Flow was superb, logical, challenging enough and perfect for the fog. Thank you gdc.

[@SleepyHarryZzz]

The modular maths was nice for box 5. I concede I didn't clock that as quickly as Simon and ended up brute-forcing it a little bit, much preferred his / your version! Otherwise I found the solve path very smooth and enjoyable. I especially liked how it felt like solving most of a box and then getting a tiny thread peeking out of the fog begging to be pulled for the next box. Very well constructed gdc.

[@leeuwevdh]

Does gdc stand for anything?

[@AndyeKAA]

I wish i'll find a man someday, who will look at me, how Simon looks at these foggy puzzles 😅

[@toddbiesel4288]

The biggest surprise in this video is that Simon said the name "Alexis" twice at about the 5:52 mark and the machine didn't respond.

[@danielarnold431]

Those fog puzzles are really satisfying! And nicely streamline the solve path for people like me, who are terrible at scanning a full grid for the next tiny deduction. Solved it in 27:38 (Solve counter 922). Didn't cach the mod3 trick in the central box, but the lines and dots let you narrow down the options until there's only one possible arrangement of digits left :)

[@smylesg]

26:24 Simon: I must have made a mistake. The Fog: I humbly disagree.

[@nmappraiser9926]

He got distracted by the 3 in the corner and forgot to continue solving the puzzle. Quite annoying, actually.

[@57thorns]

@@nmappraiser9926 At least there was no way for him to run away making his typical over complex digit resolution. Perk of fog puzzles I would say, especially one as clean as this.

[@57thorns]

Right after Simon start filling in candidates in box 4. I admit i did a bit of goodliffing (should that word be capitalized or not?) myself where i had not business filling in candidates yet.

[@Orenotter]

These puzzles so oft kick my buns, But now I don't feel like a dunce. Staying calm and comported I got it all sorted And the puzzle was not broken once! (Leaves a virtual cupcake with a big happy face on it)

[@creativename3256]

Simon’s break in was so much more elegant than mine! I basically went through the different options in my head to see if the black dot would break

[@michaellautermilch9185]

Simons net time of 35 minutes is 3x faster than mine, and he takes the time to explain all his steps along the way which takes him longer!

[@welcometogeektown]

"One of these is a one, to complement the 8." Thanks to the "Positive Diagonal" puzzle earlier this week, I'm now imagining the 1 saying "Your figure looks great, 8!"

[@joemucchiello4542]

32+ minutes because I constantly tried to add the two cells next to one another instead of the ones opposite the center. Not my ruleset.

[@dangrene617]

I LOVE fog of war! Basically every time. Generally encourages a more linear solve path, which I appreciate. Spent a while feeling stumped at the very beginning because I was accidentally trying to add up R6C6 and R7C6 to R5C6 rather than doing the opposite positions on the line. As soon as I realized that, the rest flowed very nicely. 27:27 solve time.

[@MarushiaDark316]

If Mark's expertise is in linguistics, then maybe the title for the Sannaar game should be something like, "Professional Wordsmiths Play Chants of Sannaar" for that sweet clickbait.

[@anaayoung9142]

Whoa! I can't believe that I done it! Super good fog puzzle and very intuitive! The oppening was beautiful as you said! Thank you for the video Simon! 🤗

[@aulonocara2010]

i got different 3 in the corner graphics, went deet ddet doot

[@imogenoliver]

I really enjoyed this puzzle, I love the lilac colour. It took me much longer than Simon to solve though I’ve only been doing variant sudoku for a few weeks. It feels so good to do be able to do such a cool puzzle that’s difficult but not incredibly hard either 😀.

[@michaelmatter1222]

Great puzzle gdc! Very wonderful and concise construction, not too few clues nor too many. Cheers, 99% Sneaky

[@inspiringsand123]

Let's Get Cracking: 09:12 Simon's time: 35m25s Puzzle Solved: 44:37 What about this video's Top Tier Simarkisms?! The Secret: 4x (14:21, 14:21, 14:31, 14:36) Maverick: 3x (08:13, 08:16, 08:16) Three In the Corner: 2x (25:58, 29:23) And how about this video's Simarkisms?! Brilliant: 11x (05:32, 10:30, 35:23, 35:27, 41:03, 41:54, 44:05, 44:08, 44:40, 44:46, 45:09) Ah: 11x (12:45, 14:11, 18:20, 20:06, 22:01, 23:23, 25:15, 35:23, 35:37, 35:51, 38:24) Beautiful: 10x (09:59, 10:02, 10:56, 11:00, 11:48, 18:20, 22:05, 22:07, 24:33, 35:14) Sorry: 7x (04:15, 12:36, 14:00, 23:07, 23:23, 26:52, 42:28) Hang On: 7x (07:37, 15:55, 26:11, 30:08, 39:10, 40:01, 42:21) In Fact: 7x (09:29, 20:59, 29:08, 32:01, 40:03, 42:14, 43:45) Gorgeous: 4x (10:25, 11:03, 11:51, 28:49) By Sudoku: 4x (22:53, 23:36, 34:13, 35:55) Obviously: 4x (06:54, 11:23, 15:16, 37:32) What Does This Mean?: 4x (07:38, 09:51, 10:42, 32:54) Cake!: 3x (04:40, 05:34, 06:16) Lovely: 2x (43:34, 43:37) Elegant: 2x (11:51, 45:03) Stunning: 2x (44:51, 44:53) Wow: 2x (36:38, 38:27) Nature: 2x (26:56, 31:48) Goodness: 1x (33:12) Naked Single: 1x (33:22) The Answer is: 1x (23:31) Clever: 1x (38:54) In the Spotlight: 1x (29:25) Incredible: 1x (00:31) Take a Bow: 1x (45:06) Disconcerting: 1x (25:45) Shouting: 1x (05:18) Surely: 1x (12:54) That's Huge: 1x (42:25) Pencil Mark/mark: 1x (29:49) Most popular number(>9), digit and colour this video: Ten (4 mentions) Three (73 mentions) Black (11 mentions) Antithesis Battles: Low (2) - High (1) Odd (7) - Even (5) Highest (2) - Lowest (1) Black (11) - White (3) Row (4) - Column (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!

[@PennyLapin]

I count an extra one, whenever simon says "it's broken" or "I've broken it" in a video

[@ericpraline1302]

I don't think this puzzle was too hard, but I made a right dog's breakfast of it at the start and much head-scratching occurred.

[@damienhanrahan1162]

Simon states that we know the cells of the first zipper line from the start as the line continues into into r4c4 and r6c6 but there is nothing in the rules that states we know this? The zipper line is 5 cells *long* which means it's reasonable that a terminal cell on the line as the line run the full length along it without continuing?

[@uigrad]

I can't believe this puzzle has more than 12,000 solves in just 12 days. I had a lot of fun doing it, as I can see many others did as well!

[@btuftin]

Loved this one! Tried figuring out the initial black dot stuff by pencilmarking, and when that failed did some maths since that was in the video title!

[@sacredsock8031]

can't wait to see zipper lines mixed with doublers or Schrodinger cells

[@Zeekfox]

I ended up giving up kinda early based off the nature of fog. In the central box, I did get the 1 and had the correct conclusions on the geometery of the first two lines, I somehow thought the line with the doubled digit would be larger and tried to put the 9 there and the 7 as the center of the other line. When the fog didn't clear, I realized it was wrong, and it just felt like it would be cheating to keep trying digits in the fog.

[@peterhaagen8506]

Wow this was so nice to see. I did stop the video a few times to think it over. Can’t wait for some GAS version like this to practice and have fun. ❤😊😉

[@57thorns]

42:50 is the Simon deduction of the video, instead of using the 1 in the column, Simon uses the sums after a lengthy deduction.

[@Orenotter]

Sometimes I think the option of switching to condensed rulesets would be helpful. For instance, this could be summed up as -Normal -Fog of war -Zipper lines --All 5 cells long --Orthogonal only --Can't share cells -Kropki dots For non-beginners, that's way easier to read and reference.

[@Ardalambdion]

Horray, I get a fogged zipperline for my birthday!

[@deraikz]

My favourite part of CTC is where Simon says "Im stuck, I must have made a mistake." And I keep screaming at the monitor.

[@KANPAI666OPPAI]

35:26 for me. Really nice solve path around the grid with just enough bread crumbs to give you the next deduction, though box 2's line probably gave me the hardest time in figuring out the next step. Great puzzle!

[@britlion]

I'd be very surprised to see Liverpool playing to lose.... I'll get my coat.

[@agoristtaxadvice]

A fascinating puzzle, and an excellent solve.

[@danglez28]

Simon, this was an amazing puzzle and after solving it and watching you solve it I think I figured something out, fog of war puzzles are incredibly fun to solve because they help discover the logic behind the special rules of a puzzle, helping someone to learn and discover the incredible and fun interactions the rules create. So in short I think fog of war should be the new way people should be introduced to a new rule or logic in order to teach them how to spot the idea behind the absolute magic that this puzzle creates.

[@iambicpentakill]

Yes, I really appreciate the "LOOK HERE" nature of them.

[@richardgower2605]

I can't be the only one waiting daily for the 2h 40m drop? The suspense 😂

[@jonbrowne]

Couldn’t understand the first number placement so early night for me.

[@LavenderGooms]

My nightmare! Stuck in the fog and required to do math to escape!

[@tessabrisac7423]

🎉🎉🎉

[@eddieharwood7788]

That was brilliant. I love fog puzzles and suspect that that would might have been harder without the fog because early on it is clear where you have to look.

[@vincentbarraza1115]

Filipino should be: REYNA ELIZABETH IKALAWA

[@smylesg]

Minor request: Please don't draw purple lines over foggy cells. For me, it's practically invisible. All the lines in this puzzle are the same color, so for puzzles like it, it shouldn't get in the way of the solution path.

[@praematura]

Got off to a bit of a slow start, but did finally find my way through in a time of 29:17, really nice puzzle! Many thanks to gdc for a very cool fog puzzle!

[@wibblywobblyidiotvision]

What a lovely puzzle. 47 minutes for me, the hardest bit was getting an initial breakin past the initial 1

[@creativename3256]

25:36 for me 😊

[@chocolateboy300]

I finished in 50 minutes. This one was really fun. I quite enjoyed the search for the center in the fog. The logic flowed nicely from that thought. I did get lost searching the difference between an 8 or 9 on a center line before realizing that I had a 6 and 3 on each end, obviously indicating it was a 9. Great Puzzle!

[@etienneschramm83]

Got it in 47 min. Fantastic puzzle, superb flow (as per usual on fog of war puzzles presented on this channel). Loved it!

[@ExodaCrown]

The funny thing is Simon was right about r6c3 being a 3 or 6. That was a clever break in, I asked if 9 was the second zipper center and it broke the puzzle because of the pressure the black dot was placing in the box. Then went through maximizing the centers because 9s were very restricted with the lines. Took me forever to fix the black dot in box 5 because I forgot about the zipper line rule. Then again at the end to break up the deadly pattern. All in all it was an easy puzzle and I enjoyed solving it. Took my a little under 56 minutes to solve. Edit: Watching Simon solve it made me realize how bad I am at spotting naked singles. The one in box 6 would have made my life a lot easier since that box is where I got stuck at for the longest time compared to the rest of the puzzle.

[@LuProch]

Simon's enthusiasm is off the charts :-D These videos are so positive, i love it :-)

[@robtheslob9649]

I saw this fog puzzle and thought..... "I'll may be able to think my way through it"........... Nope!! I did however, enjoy watching a genuinely intelligent person finish it......

[@Penthor20]

Great puzzle. Solvable by 'reasonable' logic rather than things like set theory. It did mean I stayed engaged and completed it. Very clever!

[@EmonEconomist]

Finished in 25:50. That was a very interesting ruleset, I enjoyed that a lot! Only made one significant error along the way (which the fog caught for me so I was able to backtrack and correct my logic).

[@stephenmccarthy1795]

And Mark may be faster than Simon, but he can’t compete with how much Simon has fun singing the song. He loves it too, but without the same innate love for music and poetry.

[@Coyotek4]

22:45 ... can't get enough of that wonderful fog NIce puzzle!

[@MattYDdraig]

20:58 Really strong use of the zipper restrictions with the fog helping concentrate the mind into the right places.

[@jjkthebest]

I did way less maths to figure out the middle box. After you know the digit outside the box is 6 or 3 you can deduce that those can't be on the black dot. Then you can see that the bottom of the black dot can't add up to 9 with the digit outside the box. Then you can keep going the way you did.

[@LithmusEarth]

21:24 we did the math, since you choose 7 we know it's a 3. If you had chosen 8 it would have been a 6. We did the whole 48/51 thing.

[@Twiztedgoalie]

Okay…now I’m imagining a zipper line spider branch.

[@stephenmccarthy1795]

Sorry Simon, but I don’t think that you can distinguish between lavender and hot pink.

[@Adrian_Grey]

I'm glad I tried this constraint with a FOW first because I kept trying to add digits on the same side of the line. I made SO many mistakes 🤣

[@lukostello]

zippers which aren't exclusively 5 lines long would be fun

[@ApesAmongUs]

Getting from box 6 to box 3 and then from 3 to 2 slowed me down a bit, but then it was all easy x-wings in 1,4,7.

[@six_5000]

I took a break from fixing my car to solve this in 37:21. Now the suns down and the garage is freezing but worth it!!

[@MarcusTheDorkus]

Got it in just under an hour but I was stuck for a solid 15 minutes in box 9, missing that I could place a 9 in there.

[@Hakucho64]

Solved in just over an hour with no help, nice puzzle, although it felt a bit bifurcatey at times.

[@stephenmccarthy1795]

How we miss you? Is Simon attempting to use reverse psychology?

[@ronjohnson6916]

Those lines repeatedly messed with me. I kept trying to treat them as arrows which is unhelpful in the solve.

[@sanctionbuster]

74:45. Really struggled. And I love maths...

[@grumpybear5874]

Really looking forward to Chants of Sennaar with you both

[@emdiar6588]

Simon, you missed an opportunity for a song at 32:00. You got something against 90's Hip Hop?

[@bobblebardsley]

27:13 I think it's an optical illusion but my brain is convinced it can 'see' the connecting line in r7c9. 🤪

[@ffets-SEP]

There was a lot to think about it, but it went quite smoothly. Took me 83 minutes to solve.

[@jenniferlenfestey5335]

Great puzzle and great video, the Outro music got cut off though.

[@Dotesmite]

wonderful puzzle, took me just under an hour to solve

[@UndustableBusters]

Took me an hour and 40 minutes, but I solved it! Cheers :)

[@orkleth]

This was one was harder for me since I kept making the mistake of thinking that each line from the center summed up instead of each spot an equal distance away. So much backtracking.

[@yoyokid9102]

1, 2, 4, 5, 7, and 8 are not divisible by 3. I do not understand.

[@msignaig]

This channel is among the most wholesome, interesting, and satisfying on KZbin. Solving some of these puzzles is no small feat, but explaining them step by convoluted step without an ounce of pretense or condescension is astounding. I don't have the patience or skill for half these puzzles, but I will watch happily as long as these gentlemen post content. Thank you for doing what you do!

[@drawsgaming7094]

35:13 Not much harder than some of the GAS puzzles.

[@EvieOConnorxoxo]

I resent the implication that learning maths isn't usually fun

[@Mephistahpheles]

I love that every line broke down with different logic.

[@77kaczka77]

Beautiful puzzle. Fresh and nice smoothly composed. So was a Simon’s solution. I love to see both Simon and Mark at their logic work, but (I hope, you are not offended with this comparison) the author is a composer, the solver - the conductor of the digit’s orchestra.

[@GepettoDaShaman]

Can someone please explain me the logic around 29:00 in video? Why there is a confidence to use 34 pair and make it 7, but not 35, which makes it 8? both 35 and 17 are available for this line and I can't spot the exact reasoning why it was excluded for the sake of sum of 7. Thanks!

[@MrGrog90]

It's because of Row 9. Once the 3 is locked on the zipper, you get a three in the bottom-left of the grid which makes the bottom-right an 8. Then the 8 is no longer available for the centre of the zipper line and it becomes 7=3+4.

[@PeterZaitcev]

30:09 for me. Got stuck for a while in the corners 3 & 9

[@mskleftwich]

14:39 “don’t let on to anyone you don’t like” 😂

[@davidtieman4102]

I love the new animation for three in the corner at least for me.

[@MarkWiseTechno]

57:29 for me!! That was very lovely

[@PathOfShrines]

Fun! A couple cute bits of reasoning. 28:52

[@林老師-i5d]

58:41 for me nice puzzle and solving

[@57thorns]

At 23:20 I suddenly got an urge to visit London?

[@Ennar]

Learning maths IS FUN.

[@Timlagor]

45 minutes! I might stand a chance!

[@thomasreuter1614]

42:41, super satisfying

[@adrianhead6272]

Completed in 21m47s.

[@brachypelmasmith]

this one was really nice and fun one

[@khoozu7802]

43.22 just put digit 4 in R5C2😂

[@michaelpdawson]

Deet deet doot???

[@wolframiaa]

40:02 for me. I usually don't try to solve myself but I'm happy I did with this one. I missed the beautiful math logic at the beggining, but I loved the flow :)

[@F1r1at]

Nice puzzle. And even though Simons break-in is beutiful I'm glad you're not required to do it, otherwise it'd be a big problem for me x)

[@1978jra]

I asked Googles Bard why Simon always sings about three in the corner. Answer was started with accurate statement, but then... well read yourself. "The quote "that's three in the corner, the three in the spotlight, losing its religion" comes from the song "Losing My Religion" by R.E.M. Simon sings it in his videos because it's a catchy song and it's also relevant to the puzzles he's solving. In the song, the singer is talking about losing their faith. In the context of Sudoku, this could be interpreted as losing the ability to see the solution to a puzzle. Simon often sings the song when he's stuck on a puzzle, as a way of saying that he's struggling to see the solution. The song is also about the feeling of being lost and alone. This is something that Sudoku players can relate to, as they often spend hours trying to solve puzzles on their own. Simon singing the song can be seen as a way of connecting with his viewers and letting them know that they're not alone."

[@tessabrisac7423]

😂😂😂

[@Anne_Mahoney]

That's so random it's almost useful! 😺

[@1978jra]

@@Anne_Mahoney True!

[@_aullik]

I made the same "mistake" with the 12 pair in box 9. It took me far too long and i felt really stupid afterwards. Well i guess nothing better than Sudoku to humble oneself

[@Yttria]

Brute forced the black dot zipper line as there were only 3 possibilities. As others mentioned it had a nice flow and some fun logic reaching into the fog for moving forward. (27:58 for me)

[@mikepictor]

38 minutes. I beat Simon! It's not actually hard as such, but it just takes some patient elimination of possibilities. So not fast, but I was never once stuck either.

[@theashen]

Picking myself up off the floor that i finally solved a puzzle faster than Simon did! Very nice logical flow, with always just enough to solve the next part

[@JalebJay]

At 29:20 where was the deet deet doot?