Normal Sudoku Rules MOSTLY Apply!?

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** TODAY'S PUZZLE **
Well, what can we say about this one... it's quite mad and utterly beguiling! It's called Killer Shikoku and it's the work of the_cogito. The rules completely flummox Simon but can you make sense of them? Give it a try at the link below:
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Rules:
Normal sudoku rules mostly apply; however the grid contains no 5s. Instead every row, column and box has a single repeated digit. (NB Beware! This does NOT mean that you could find nine cells in which 5s could be placed to make a genuine grid!) Additionally: divide the grid into rectangular regions of orthogonally connected cells. Each rectangle contains exactly one circle. A single cell with a circle counts as a 1x1 rectangle. A number in a circle represents how many cells are in the rectangle the circle belongs to. Rectangles cannot overlap. Every cell in the grid is part of a rectangle. Digits may not repeat in a rectangle.
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Опубликовано:

4 авг 2024

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Комментарии : 317

@the_cogito5170 2 года назад

The_cogito here. Really well done to Simon, I could tell you weren't sure if you'd broken the puzzle or not partway through, but you did great. I'm sure it's not hard to imagine that setting this puzzle was difficult lol, it's brainbending through and through. Thanks so much for another feature, this so far has been one of my proudest puzzles, I loved watching this, and am extremely grateful

@cbear7996 2 года назад

gorgeous puzzle!!

@yvaskhmir 2 года назад

This puzzle's ruleset looks like someone just finished a very hard puzzle with the rule that no two orthogonally connected digits can sum to 5 or 10 and developed a hatred of 5-s. But it's absolutely magnificent. And 5-s are overrated.

@etienneschramm83 2 года назад

I LOVED this puzzle! It made me feel really stupid at times, but I finally managed to find the solution. It took me about two hours and a half. I am amazed I managed to go all the way without making a mistake. I really had to double check every small deduction. I can't begin to imagine what a nightmare the setting must have been!

@martinbull-gundersen8878 2 года назад

Thank you so much for this puzzle! It's probably the funniest puzzle I've solved this year. It really never gives in, but its also not extremely difficult (more mind bending and forcing you to "unlearn" a lot of standard sudoku techniques). Also fantastic solve by Simon. Must admit I''ve been hoping for him solving this :-)

@the_cogito5170 2 года назад

@@yvaskhmir Haha zetamath made an open challenge for setters to set a sudoku with no 5s in it, and left it for us to interpret that how we want. It's a running joke that zeta thinks 5s are boring :P I'm really glad you enjoyed it.

@koegerli 2 года назад

Simon: I refuse to pencil mark cells with 5 or more options! the_cogito: Challenge accepted 😏

@roryparle 2 года назад

Really interesting ruleset. It seems to be tricky to remember that doubles aren't allowed in the cages even though they're expected in the rows, columns and boxes.

@jeffreylantz546 2 года назад

I don't think the logic at 46:10 was sufficient to show the 6 in r7c3 had to go up, because the green 6/8 in r4c7 could've gone right, with 2 in r2c9, 2 in r3c9, and 4 in r5c9. A supremely confusing rule set, but trying to second guess Simon at every deduction made me feel like I somewhat understood what was going on. A fantastic solve! EDIT: Just realized you can't do that because it puts double 6 in the red region, but Simon didn't use that so I still feel justified.

@stegra5960 2 года назад

Yes. I agree with you completely. I spotted the same flawed logic and he didn't use the two 6s in one region as a reason for dismissing it. Pleased I saw your comment before posting myself as I hadn't noticed that.

@Croccifixo 2 года назад

I was actually coming to the comment section to mention that although the logic was flawed at that part, the conclusion was correct if he had considered the implication on the red rectangle having 2 6s instead. I had considered this when looking at if r6c3 could be in the rectangle belonging to r6c8, concluded that then that rectangle had to be a 7 and go all the way to the edge, otherwise it would repeat a 6, so the implication that the red rectangle was limited from taking column 9 meant r6c3 had to go up.

@jimmyh2137 2 года назад

This doesn't work because R7C9 can't be reached by any circle.

@lewsouth1539 2 года назад

I just posted my own comment about this very issue.🤪 He quite put the cart before the horse.

@RichSmith77 2 года назад

@@jimmyh2137 r7c9 would be reached by the circle in r5c9. It doesn't work for reasons others have mentioned (repeated 6 in red).

@rowanbrown5541 2 года назад

I love that toward the end you forget that Shikaku's can't repeat and start proving solely via doubles already existing

@aesheronanglvd3th309 2 года назад

The 2-4 pair in the purple shukaku had me internally screaming for ages.

@alexandraritter3542 2 года назад

It was really difficult to keep all the rules in mind at any one time, and I think we'll likely each favor some over others. I often saw things that were different from his path in this one.

@dkosmari 2 года назад

It's so funny to see Simon declare the Shikaku rule to be the easiest one to use, and then forget about it 5 seconds later. He spent most of his mental energy trying to not do Sudoku.

@PuzzleQodec 2 года назад

This puzzle is brilliant. Really happy this got featured!

@bramdesmit1196 2 года назад

The sigh of relief that escaped me when you disambiguated the 6/7 in the middle of box 7 at 1:11:10 after I had been staring at it for 15 minutes! Sometimes you really miss some simple clues, but since trying some of the puzzles on this channel I’ve learned that that’s just your brain going blind lol. Really loving the content, it opened up a whole new world of sudoku’s for me. Keep it up!!

@KaiSteinbach 2 года назад

LOL ... available since 44:36 ... almost half an hour. :) But would it have helped logic elsewhere?

@UnGeekCommeUnAutre 2 года назад

don't talk about the 1 in row 9... eliminated at 1:02:00 while sitting there in the box with the other 1 for at least 1/2h .... ;D and this poor 2 in column 7 that is just asking (crying in fact) to be freed from the 9 since he place the 9 on top row.... painful ahaha

@leojs5673 2 года назад

Watching for the first time from my very own first ever apartment as I start college this week 🤓 thanks for keeping me company through the craziness of moving away, Simon and Mark

@andersosterholm2538 2 года назад

This is a wonderful puzzle! I love when there is some crazy rule forcing you to think in weird ways. And well done Simon, I think you did a great job.

@HunterJE 2 года назад

Another way to look at the rule Simon struggled with at the start is to note that e.g. a digit repeating in its column does not necessarily mean either of the instances must also be the repeat in its respective row and box, which would be the case if it were just substituting out the 5 positions in a valid grid...

@guitartailor 2 года назад

Had to think about that for a second but I think you're right! Quite simple put that way

@devinpelech 2 года назад

This would have gone smoother for Simon if he always remembered digits can't repeat in rectangles/shikokus lol

@David_K_Booth 2 года назад

When I first found myself thinking "ah, there's a 1-2-3-4 quintuple in row 9" I got a fit of the giggles. Brilliant puzzle although not easy.

@SamThe42nd 2 года назад

I love how ridiculouss some of these puzzles are getting. I'd never be able to solve them myself but love watching you explain them. Keep up the great work!

@cbear7996 2 года назад

i’ve been having a really rough week, and this really brightened my day

@dudbike 2 года назад

I hope this week gets better for you! I hope spring has spring where you are and you can enjoy the spring flowers and birds!

@cbear7996 2 года назад

“I know that you all completely understood it” actually, for the first time, i did completely understand it, and i feel proud of myself

@AexisRai 2 года назад

The "Shikoku" here is probably a portmanteau of Shikaku and Sudoku, since their rules are being merged. [Shikoku (四国) is the smallest of the four islands of Japan, and shikoku (市国) means "city-state (e.g. Vatican)", but neither of those have bearing here.]

@emilyscloset2648 2 года назад

4 country checks out then xD

@kevinmartin7760 2 года назад

1:07:47 Eliminating the 6 from R1C6 seems unjustified (though turns out to be correct). The double digit has not been identified in any of row 1, column 6, or box 2, and the rectangle does not contain any other forced 6. Simon says "which we've just seen can't go there" but I don't recall seeing any such thing. Even eliminating the 1/6 from R1C5 he only really seemed to half realize that the he had the double 7 in column 5 to justify that, since he just "noticed" the double 7 when he observed that means the 2/4 pair was a genuine pair. Perhaps the valid removal of the 6 in R1C5 was incorrectly echoed as validating removal of the 6 from R1C6. Or maybe I'm missing something...

@dsquirrel 2 года назад

Yes it was unjustified but he didn’t use it - concluded independently later that the cell had to be a 1

@ozlich 2 года назад

Agreed, came here thinking the same thing - luckily he didn’t use it and it didn’t break anything.

@HeyRa131 2 года назад

Sudoku habits are tough to break I guess.

@ozlich 2 года назад

@@HeyRa131 Yeah absolutely understandable, what a mind bending puzzle!

@inspiringsand123 2 года назад

Rules: 02:03 Let's Get Cracking: 08:44 What about this video's Top Tier Simarkisms?! Bobbins: 1x (51:26) Knowledge Bomb: 1x (18:39) And how about this video's Simarkisms?! Ah: 22x (14:54, 18:33, 20:12, 20:29, 20:29, 22:24, 26:09, 26:10, 27:12, 27:30, 28:02, 36:02, 41:08, 43:34, 46:36, 50:35, 52:40, 54:33, 59:07, 1:00:44, 1:05:12, 1:09:36) Hang On: 6x (02:07, 05:25, 05:31, 54:50, 59:37, 1:09:25) Sorry: 5x (45:01, 48:58, 55:59, 56:01, 1:09:48) Beautiful: 5x (28:07, 28:11, 30:51, 35:07, 47:27) What Does This Mean?: 4x (15:19, 44:50, 1:01:04, 1:03:04) What on Earth: 3x (27:36, 27:42, 1:14:13) Ridiculous: 3x (17:55, 1:08:45, 1:13:14) Wow: 3x (23:42, 23:42, 1:03:10) Good Grief: 2x (30:53, 58:21) Goodness: 2x (12:22, 1:15:08) Nonsense: 2x (17:37, 17:44) Extraordinary: 2x (01:00, 01:31) In Fact: 2x (11:47, 19:54) Apologies: 1x (00:17) Clever: 1x (52:54) Naughty: 1x (41:20) Lovely: 1x (31:02) Break the Puzzle: 1x (10:18) Fascinating: 1x (1:15:50) Incredible: 1x (01:43) Barbaric: 1x (1:04:21) Disconcerting: 1x (56:19) Our old Friend Sudoku: 1x (20:29) By Sudoku: 1x (08:48) Of All Things: 1x (56:31) Flummoxed: 1x (00:46) Bizarre: 1x (1:15:46) I've Got It!: 1x (52:40) Obviously: 1x (34:41) Progress: 1x (42:35) Juxtaposition: 1x (45:39) Pencil Mark/mark: 1x (11:02) Most popular number(>9), digit and colour this video: Ten (2 mentions) Two (158 mentions) Green (9 mentions) Antithesis Battles: Low (3) - High (2) Even (4) - Odd (0) 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!

@evetheeevee2977 2 года назад

The rules were actually at 2:03 or 2:04, the time you mentioned, although Simon did say "rules", he did not further go on about the rest of the rules.

@inspiringsand123 2 года назад

@@evetheeevee2977 Thanks!

@coralfeatherstone7019 2 года назад

I would love to see an end-of-year summary of the puzzles ranked as having the highest of each Simarkism. 😆😄

@jillwalker5206 2 года назад

I feel like I need how many times he said “mental”

@centroid41 2 года назад

I'm always impressed with how fast Simon (and Mark of course) adapts to the new logic in "non-traditional" sudoku puzzles. My brain was definitely taking some extra time to warm up to the rule set :)

@markp7262 2 года назад

51:46 finish. Absolutely brilliant puzzle. I would love to see more of the "sudoku rules mostly apply" ruleset. It can be difficult to follow along sometimes, but when it's over you know you accomplished something.

@briancaster2876 2 года назад

I want to see another Schrodingers sudoku, that one was so much fun to watch.

@tyfunk8614 2 года назад

Well that was total insanity, it's so hard to adjust your logic to all the different rules. Great solve, super fun to watch, and shorter than I thought it would be! Good on you for not getting stuck haha. Really hoping to see some streams from you guys soon! "Please don't touch anything 3D" would be great to watch!

@originalelijah9541 2 года назад

I remember test solving this puzzle and I absolutely loved it! I’m so glad it got featured on the channel! Amazing stuff!

@e7diablo 2 года назад

Simon: I must not forget to focus on the shikoku/circles and not attempt sudoku Simon: [immediately focuses on sudoku]

@darleneofthetallpines5742 2 года назад

This puzzle and this solve are so very entertaining! The time just flies by!

@KaiSteinbach 2 года назад

Well done, Simon. I was wishing that we could have multiple layers of different colour markings - almost like the Photoshop layers. Imagine you could give these layers names, and then use one layer for duplicate in row markings, another layer for duplicate in column, a third possibly for duplicate in traditional 3x3 box. That would be a software enhancement. A constructive tip I have, that does not require a software release is to "release" colours more frequently. Often, you either keep colours till the end, or even apply them to areas where the colour is only aesthetic (for completeness) but no longer for puzzle solving. Instead, sometimes colours could be reviewed, as in "do I still need this colour to conclude logic elsewhere?" - and if the answer is no, remove it. In this particular puzzle, I would have prefered 2 or 3 colours for marking line / row / 3x3 duplicates, possibly a 4th colour to mark circles which are done.

@HunterJE 2 года назад

Finally, back to being able to watch Simon videos on my lunch break on weekdays!

@Laurana07 2 года назад

I'm so happy with myself for solving this. It took a while, but time flies when you are having fun!

@crashtextdummie 2 года назад

"That might be real, or it might not be real. In the sense that one of those digits might be wrong." This is already my favorite video ever in terms of quotability, and I'm only 24 minutes in.

@PauxloE 2 года назад

Finally a puzzle where the Secret doesn't apply!

@NotCochon 2 года назад

Running a terrible fever today and this video was exactly what I needed to distract myself for some time. Wonderful solve, Simon! Can't wait for the next one :)

@Wecoc1 2 года назад

Simon... Shikoku = Shikaku + Sudoku [Insert here a joke about how this is like his Sudoku scanning]

@bezowee 2 года назад

I want to make comment like that and I was thinking about the joke then I saw this😂

@jamesackerman7473 2 года назад

This is the first time that I have ever been ahead of Simon multiple times throughout. Apparently this rule set really worked with how my brain works. Most of the time I'm miles behind haha! Really cool puzzle!

@EelcoWind 2 года назад

Loved it, took me little over an hour and a half, but never frustrated and nice logic all-round!

@Megatron9000 2 года назад

25 minutes in and I am so invested in this solve. I love this rule set!

@albertsandberg 2 года назад

Great work Simon. Never excuse yourself for your thinking time nor do never jumpcut it. It gives us mere mortals a chance to catch up and find something too and makes it interesting to watch how long time it takes.

@th.nd.r 2 года назад

r6c3 frustrated me to no end ngl lol. It’s in the same purple region as the 4 so it can’t be a 4! But for real great video, great solve, great setting, love the ruleset, the_cogito is so brilliant, and I do like these kind of puzzles that mess with normal sudoku rules on the channel, because I know Simon will always find the solution but there will be those entertaining moments of brain breakage every now and there lol. So yes I like this sort of thing and want to see more of it, well done, thank y’all for being awesome💙

@MattGriffiths81 2 года назад

What a puzzle, and what a solve. Switching between looking at rows, columns, boxes, and shikakus was an interesting task in itself. Every time you had to reassess what the rules for that particular thing were.

@martinbull-gundersen8878 2 года назад

Oh. Looking really forward to watch this. It is a fantastic puzzle! I really understand Mark's "change" in the rules, it could've spared me quite some time when I solved it :-)

@thehermit761 2 года назад

It is always a pleasure to watch you do these puzzles both you guys are on another level. I myself have started some sudoku vids and live in London would love to meet up some time.

@emilywilliams3237 2 года назад

I did not notice the time passing ... no chance at all that I will give this one a go, but definitely enjoyed seeing you work it through and come to a successful conclusion, Simon.

@lydiagould3090 2 года назад

Amazing, I couldnt have done it on my own but followed along while you solved it . Enjoyed the challenge!

@juliusenderling3902 2 года назад

That's how a sunday should end!

@956675 2 года назад

That was so much fun to watch. Can't say more than that or I would go on forever. Instant favourite.

@Nathan511 2 года назад

I love how normal sudoku rules don’t apply in this one. I think Simon is so used to normal rules, he just can’t help almost falling into those habits. Very fun to watch.

@soulbound11 2 года назад

Spectacular! This one really threw me for a loop. Proud i was able to finish it. Took a couple hours though...

@jongarrett2388 2 года назад

Took me 4 hours (11pm - 3am!) but happy to say I completed it. The disappointment when I got the "uh that doesn't look right" message turned to relief on watching the end of your video...

@Alsadius 2 года назад

I feel like the right marking style for this puzzle might be three colours to mark off the doubles - one for row, one for column, and one for box. Having your doubles properly marked seems like it'd help immensely.

@peterstromberg9614 2 года назад

From now on one of my favorite sudoku puzzles.

@Zuldaar 2 года назад

Amazing puzzle, spent exactly 120 minutes, down to the 5th to last digit where it turned out that I had broken it at some point. Can't wait to watch Simon solve it and show me where I had my mistake

@ronjohnson6916 2 года назад

Mind blowing. As long as I use Simon to get the basic grid I could make the little minor deductions with a lot of coloring. But yeah so tough to stop the sudoku "eliminations" that aren't valid. Wonderful solve that plays to Simon's real strength -- adapting to rules variations.

@anwenroberts7887 2 года назад

This feels like a sudoku you would solve in Alice and Wonderland. Great job solving! It definitely hurt my brain trying to think about it.

@Jesthers 2 года назад

Oh, I was able to finish this one as well! Always feels good to be able to beat a puzzle for once 😁

@ruokothyan7658 2 года назад

Simon: this is good, i have two 8s in the collum. Me: 😂 never thought this day would come ...

@3Jeroen3 2 года назад

After an hour Simon forgets that digits can’t repeat in a cage

@wydadiyoun 2 года назад

I miraculously managed to solve it without contradiction! for some reason I was almost sure I will have a contradiction but I didn't! great puzzle

@menbah 2 года назад

Quite unusual to actually see Simon struggle with a rule set, usually the scanning is the only thing holding him back. But not surprised this would be the one to do it, what a wonderful monster!

@MrBlubb80 2 года назад

Amazing puzzle - a joy to watch!

@tehcanadianbacon314 Год назад

Whooo Hooo, finally finished this one. Had a pretty good time before I checked my work and realized I had 2 doubles in one row. Had to reset about 20 moves to find my mistake lol. Really cool puzzle and I got a lot of practice using some of the new tools :)

@bodemeister118 2 года назад

How Simon or anyone can navigate through this puzzle without making a mistake is quite remarkable. I'm a pretty good solver and made a couple goofs on this one.

@genevieve4679 2 года назад

That was so much fun!

@G.Aaron.Fisher 2 года назад

First one in a long time that I've had to give up on and come back the next day. Glad I did, because rereading the rules it turned out I missed one! Much easier without digits repeating in rectangles.

@Ian_Hay 2 года назад

Great, great solve of a mind-bending puzzle that I gave up on way too soon.

@kordellcurl7559 2 года назад

What you could do is put a grey flash on the repeated digits. Technically to check you could whiten the grid and use the checker because it would show the wrong digits either way. (In which should be 1)

@sugarfrosted2005 2 года назад

Now I've seen everything, a 1-2 triple!

@alibaageel9731 2 года назад

The lower pink box really bugged me because it is obviously a 2 not a 4 since there cannot be two 4s in the same shikoku😂🤦🏽‍♂️

@stegra5960 2 года назад

Me too. And in the end he still didn't notice that and placed it by different means.

@stevieinselby 2 года назад

Wow ... that puzzle was *insane* 🤪 ... I'm not surprised your head was fried!

@GarionBoggod 2 года назад

I found the distribution of repeated digits in the solution to be fascinating, I was expecting it to be more even. It's great that a couple digits were never used as repeats while others had multiple instances of being duplicated.

@pixllo 2 года назад

Gosh that messed with my brain big time. I somehow didn't take notice of the rule about not repeating numbers in a rectangle which made my life so hard... but enough to figure out most of the half left rectangles. So I didn't feel like I was missing a rule lol. Very good puzzle

@elizabethswann05 2 года назад

when Simom got stuck in the 56th minute there where so many things to spot: the 69 pair in r2c12 because of the box, the 7 in r8c2 also because of the box and around 5 ninutes later the 2 in r7c7 because of the colum. (I am writing this because I'm kinda screaming at the screen right now which isn't helpful while trying to fall asleep which is what I'm trying rn; also I wanted to make clear that I have a lot of respect for Simon's sobbing skills. whenever I'm screaming at the screen I also remind myself that I would've never come this far and I'm absolutely amazed by the videos from this channel and so thankful for the opportunity so learn so much about (solving) Sudoku!)

@elizabethswann05 2 года назад

sorry I meant "Simon's solving Skills"

@josephsugarmann6765 2 года назад

I was going to suggest that Phistomephel make a hard-mode version of this puzzle, but then I remembered that his specialty is doing weird things with geometry

@Merione 2 года назад

I feel that a slightly easier way to understand this ruleset is to take the repeating digits as an extra condition to check before performing an elimination. This means that whenever you're about to eliminate a pencilmark you must always ask yourself: "Do I have a repeat in this row/column/box already?" If yes, then you're allowed to eliminate the clue, if not, then you're not allowed to do it. This was extremely fun (to watch haha)

@stevieinselby 2 года назад

I was trying to think of a way to mark where cells were duplicated in rows, columns and boxes, but with digits potentially repeating in one, two or three dimensions it would be tricky, you would probably need different colours, eg 🟦 blue for boxes, 🟥 red for rows and 🟩 vert for vertical, but scanning it would probably be more confusing than without.

@thommy4078 2 года назад

Took me 80minutes. I had a hard start (forgot about the "no 5 rule"). It was a really tough but approchable puzzle. I really enjoyed it and im happy that i solved a "+ 1hour Simon"-Puzzle.

@PauxloE 2 года назад

I approached this from the Shikako angle, trying to color every region, with partial colors where multiple options are possible. There are not enough colors for this if you don't want to resort to the grays. Then I pencil-marked in the options for each circle (unfortunately it took me a while to realize that 9 and 5 are out), and start to notice triples/quadruples/quintuples allowing to pencil-mark more. And then slowly wittling away on the options. At some point I had to resort to logic like "in these two rows we have at most 6 digits 6 and 8, and we have 7 candidates, so one of them must be somewhere else". At minute 270, I got a almost fully filled grid, with two 47 and 46 pairs left (in row 1 and row 7), which just couldn't be resolved. After activating the checker, I found that there was an additional duplicate 9 (in r6c9), which I did put in instead of eliminating it earlier, so I used undo for like 30 steps, filled the 7 in correctly, and succeeded from there on.

@gc2009able 2 года назад

It took me about an hour and a half, and I had to back track *a lot*. I kept running into erroneous assumptions and errors! Once I worked past those glitches, and had a bit of a grasp on the rules, it was quite fun! I definitely rely on being able to check the video now and then for "sanity checks", though!

@thithildeprouv8310 2 года назад

I managed to solve it in a bit more than 1h30. I was a big challenge having to reconsider everything you know about sudokus. But I loved it, it was a great way to change my mind from my studies hihi

@patrickdematosribeiro1845 2 года назад

Incredible puzzle and solve. One small remark about checking the repeats at the end: Since there were no fives in the puzzle there had to be at least one repeat in every box, row and column. It would actually be necessary to check that there is no second repeat anywhere or in other words that there is at least one 1,2,3,4,6,7,8 and 9 in each box, row and column.

@Zhon66 2 года назад

I made an incorrect assumption relatively early that did not lead to contradictions for some time, and by the time I realized what it was, it was far too late to fix it and the puzzle was hopelessly broken. Still an enjoyable experience.

@DoongXiouHua 2 года назад

45:43 r5c8 could be part of the green region, I think Simon is getting lucky there.

@gpaciga 2 года назад

Came to the comments to point this out too

@ichtusvis 2 года назад

If purple in r7 takes the stripe, then the red region in r6 will be forced to be of size six, leading to a repeated digit in that cage

@LaytonBehelit 2 года назад

True. Here's a reason why the purple stripe doesn't work. Red above purple would have to be a 6 which repeats a 6 in its rectangle.

@karlmortenlunna2417 2 года назад

Yes, it was bad logic at that point. But the purple region couldn't be a stripe, because r6c3 would be taken by the region starting in r6c8. At that region would be a 7-cell region because it couldn't repeat the 6 in its region. And that isolates r7c9.

@RichSmith77 2 года назад

I don't know which I find more annoying. That Simon made the mistake, or that I didn't realise it was a mistake when he did it and just accepted his reasoning. Glad someone was paying attention.

@TwoScoopsOfTubert 2 года назад

I really loved this puzzle

@Roescoe 2 года назад

This ruleset is amazing. I'm certain many other puzzles could be generated with it.

@Keyboardje Год назад

It helped me to give every confirmed double an extra colour flash so they were easy to spot, so I didn't have to constantly search them again.

@elfdogre2181 2 года назад

Lovely puzzle. Full of 'Simon.exe stopped working' moments 😂

@jbruuuu 2 года назад

Wow that was one hell of a puzzle. I'm proud to say I got through it but with two major stumbles where I overlooked a couple possibilities for the cells that I had incorrectly ruled out. But with some significant Ctrl+Z work I managed it eventually :P

@menturinai1387 2 года назад

Amazing puzzle!

@HunterJE 2 года назад

33:45 I think a simpler way to reach the same result here is to realize that since you know there's a repeat in the yellows, anything outside the yellows must obey sudoku rules vis a vis the column. As such, the known 3 just eliminates the pencil-marked 3s in the yellow cells outright...

@guitartailor 2 года назад

Yes exactly. The three outside of yellow means you can't have a three in yellow

@joeomundson 2 года назад

I'm not sure that works...? Doesn't the 3 have to be included as a yellow? Otherwise it's a 1234 quadruple with a 3 outside, and the 3 could repeat. I think you have to think about the height of the rectangles Edit: Oh wait the 4 yellow cells must have a repeat because otherwise they would add up to at least 10 and it needs to be 9, I understand :)

@Gonzalo_Garcia_ 2 года назад

79:26 for me. What a freaking monster of a puzzle… I’m actually really impressed that I managed to finish it at all, as I made a mistake along the way and didn’t think I would be able to find it so that I could fix it and keep going, but I eventually did. Incredibly awesome puzzle!!

@danielrhymer1762 2 года назад

61:03 for me! Pleased with that one. Certainly gets easier trying to decipher the rules the more you do the puzzle but leads to some interesting logic

@Coyotek4 2 года назад

59:21 ... I'm calling an under-an-hour solve as a 'win' for this one. Incredible puzzle!

@guitartailor 2 года назад

I think doing it quicker than the video has to count as a win!

@RichSmith77 2 года назад

I'd calling any solve a win on this beast. But under an hour is certainly impressive.

@fatercoelho7476 2 года назад

I can hardly believe that I actually made one of this sudokus :D took me 4h but I'm so happy that I finally got one puzzle right :D

@cobalteclipse117 2 года назад

I watched “normal sudoku rules cannot apply” yesterday, and now this appears today aha

@lewsouth1539 2 года назад

Here's a handy rule to remember for this sort of puzzle: In any row of boxes, the repeated digits in the 3 boxes are the same as the repeated digits in the 3 rows crossing them; likewise for columns of boxes. I found this especially helpful toward the end of my solve.

@paulanderson5704 2 года назад

Till the whole end Simon couldn't feel the fact that he could apply sudoku in his coloured boxes.

@PeterDB90 2 года назад

Does anyone know, how often do Simon/Mark stream games? They started one called Last Cube that I really enjoyed and I haven't seen part 2 so far :P

@mikes.8647 2 года назад

Maybe it would be more efficient if Simon used only the pen for the borders and then colored the shells that are "repeated" digits. It would be much easier to spot the "normal" digits! Either way, this puzzle was indescribably beautiful and mind bending, just WOW!

@disneian 2 года назад

1:07:45 My heart dropped when Simon removed 6 from r1c6 because I couldn't see what's the repeated digit in c6 or box 2 is and therefore 6 could be in that square. I'm so glad that at 1:09:27 the column logic forces a 6 in that box, thereby making it not a 6 anyway, still a great solve!

@Nickgerrits-vy2sp 2 года назад

one of my first thoughts seeing this, "There will be a challenge if you use sudoku rules, simon should have no problem" as he proceeds to try some sudoku on that 1 in box 5

@Wargarbler2 2 года назад

This seems to be a very tricky puzzle to hold onto all the necessary threads. Well solved!

@FleckerMan 2 года назад

zetamath, who sets puzzles that have been featured here on CtC, has a lovely channel on youtube (zetamath does puzzles) where he regularly streams live solves, and chat can join in - it's great fun and I recommend subscribing - the extra relevance here is he did a 'fiveless challenge' recently and many setters sent in sudoku puzzles that didn't contain any 5's (in some meaning decided by the setter) - I missed part of the stream so this one may well have been featured or connected, or could be a coinkydink - in any case, highly recommended (and close to 1,000 subscribers :) :) )

@hundehuegel 2 года назад

I thought the same when I saw the rule set

@Shade0130 2 года назад

Zeta did in fact do this puzzle during one of his streams. Took him slightly less than 90 minutes.

@PauxloE 2 года назад

56:10 "Please don't be obvious" Some easy things to see here (not sure whether they bring you much forward): → The purple 6-box has a 4 next to a 24 (which has another 24 above it, which removes the 4 from the vertical red 8-box) → Where does the 3 go in row 3? (in one of two places) → Where does the 1 go in row 6? (only one place) → Where does the 8 go in row 7? (one of two places) → Where does the 9 go in box 8? (One of 3 places, which has an impact on row 7, and the possible locations of the 9 in the horizontal red 8-box) → Box 7's duplicate is a 1 or 2 and there us a 6 in the box, so the 67 is resolved (which then has impact on the column). → Box 1's duplicate is a 1 or 2 and there are 7 and 8 in the box, so the 6789 pair gets reduced to a 69 pair (which has also a bit of impact on both columns, forcing two 8s into box 4).