Has There Ever Been A Better 7x7 Sudoku?

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Has There Ever Been A Better 7x7 Sudoku?

Рет қаралды 28,749

Күн бұрын

** TODAY'S PUZZLE **
We absolutely LOVE this sudoku from sujoyku. It's called Reliably Unreliable and features a brand new ruleset that will just make you smile. It's also just 1 star for difficulty (we would say it's probably closer to 2) so you must have a go if you have a few minutes free.
Have a go at the puzzle here:
sudokupad.app/...
Rules:
Normal irregular 7x7 Sudoku rules apply, i.e. each row, column and region must contain the digits from 1 to 7 once each. All cages are “Rellik Cages”. In a Rellik Cage digits do not repeat, and any combination of one or more digits within such a cage CANNOT sum to the value in the top left. (Eg a Rellik Cage with given value 6 cannot contain the three digits 1,2&3; the two digits 1&5; the two digits 2&4; or a single 6.
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▶ Contents Of This Video ◀
0:00 Theme music & puzzle intro
1:05 The Doppler Effect Poem
3:43 Hexcells stream on Wednesday
3:59 Riffclown's new sudoku hunt
4:23 Happy Birthdays
5:48 Rules
10:06 Start of Solve: Let's Get Cracking
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Пікірлер: 111

@nilsleder2957 6 ай бұрын

Thank you for this amazing feature, Simon! For me as a setter, it not only is a great honour but also very enlightening to watch you solve puzzles that I have created since I always learn something about them myself. Here I was not aware of your later geometric correspondence argument (which you explained brilliantly). My own solve path only used the first leftover. One comment on the bottom right region: You can actually play the pingpong game even there, but it is less obvious. When starting out with 6x6 examples I found out it was impossible to have 4-cell Rellik Cage with value 9. In other words: Whenever we pick 4 distinct digits from 1 to 6, there is some way to express 9 as a sum. Although I might appear very nerdy, let me give you a short proof why that is true. Assume we take 4 digits from 1 to 6. We can only pick at most one of 3/6 and 4/5, so we do have to pick 1 and 2. Now we cannot choose 6 (1+2+6=9) and picking 3 inevitably leaves us with 2+3+4=9 (picking 4 from 4/5) or 1+3+5=9 (picking 5 from 4/5). With this "Rellik sudoku theorem" you can state that the 9-cage has to have a 7 and go through the whole argument as you did in the video, Simon. Thanks again for this nice feature and your kind words! Kind regards, Nils Leder/sujoyku

@R_frozen 6 ай бұрын

In this particular puzzle there is another way to figure it out. When I found out that 1 has to stay in 9-cage, I looked at triplets. If we keep 3 in 9-cage, you have to get rid of 6 and 5 (135=9). Leaving you with 3,4,1,X. Now you have no place to put 2 into. It's either 2+6=8 or 3+4+2=9. Therefore you must keep 6 in 9-cage and the rest solves itself. This is not as universal as the theorem, but this was my break-in. Brilliant puzzle, thank you!

@longwaytotipperary 6 ай бұрын

❤ your puzzle and new logic to process! Very much appreciate your giving us your strategy! (I think nerds are cool! 😎)

@livedandletdie 6 ай бұрын

I didn't even think of that while solving it, I went first to the center region and noticed that a 7 couldn't be in the 7 region, so it had to be in the 8 region which meant a 1 had to be in the 7 region which meant that 6 had to be in the 8 region and thus 2 would have to be in the 7 region and then 4 and 5 would have to be in the 8 region leaving 3, and that simple logic was applicable throughout every cage in the puzzle. It only took 16 minutes to solve that way, sure I used irregular region logic as well to jot down the possible values in cells, but more than that and regular sudoku logic isn't necessary to solve it. And it's a beautiful and fun puzzle. And I must say that I really enjoyed the ruleset.

@dwebb2805 6 ай бұрын

that is an interesting principle about the 9 cage. the way i saw (which is true from the very beginning without the forced 1) is that it is impossible to put 4 in that cage (in this puzzle w/ the 8 cage opposite it) 4 excludes 5, which in turn excludes 3 from the 8 caged, and puts it in the 9 cage. now both 2 and 6 are excluded from the 9 cage and must be in the 8 cage, which is broken.

@samueldeandrade8535 6 ай бұрын

I always loved Killer Sudokus. But now I love Rellik Sudokus even more. Man, simply the best idea.

@nathanmays7926 6 ай бұрын

Good timing. I really appreciate it when you synchronize your video releases with my down time. Very considerate of you.

@ArloLipof 6 ай бұрын

Not only is sujoyku a great constructor, but also the kindest and most respectful person on LMG. Just read the comments under any puzzle set or solved by sujoyku, and you’ll be convinced.

@longwaytotipperary 6 ай бұрын

Those are traits I value highly!!!

@Millenassang 6 ай бұрын

My guilty pleasure these days : get in my bed, put some calm music on and solve sudokus… The pure joy of uncovering all the solving paths the setters put up is heartwarming and very satisfying. Thx to all the setters and CTC for all these incredible moments we get to enjoy!

@stupidas9466 6 ай бұрын

I loved my beginning, i jumped back and forth with the nine and eight cages filling in all the eights and nines and feeling so proud of myself!

@elliotcossum8199 6 ай бұрын

Always a thrill when I am able to complete a puzzle, it is not often, you guys tackle some beasts on the channel, and this one was a ton of fun. I'm glad I gave it a shot.

@emisformaker 6 ай бұрын

In fairness to Chris, he may have been distracted by the 48" of snow we got here in Cape Breton this past weekend. There's so much, they can't simply plow the roads, they have to bring in dump trucks to haul a bunch of the snow away! Bella looked up when she heard Simon say her name, which I take as her way of saying hello.

@emilywilliams3237 6 ай бұрын

I tried this puzzle, and got part of the way through using some of the same techniques that you were using, Simon, but then I came close to running out of time so I decided to just watch you solve it for the fun of it. You are a master of explaining things, especially showing SET in various contexts. Thanks for this video, and for all of the things that you and Mark do to support and recognize the rich community of setters, solvers, and viewers that have grown up around CtC.

@HudsonHornet250 6 ай бұрын

19:06 for me. Loved this ruleset, at first it was a slightly difficult concept to get your head around but solving it was a delight!

@steeevealbright 6 ай бұрын

45 minutes for me! I got stuck for a bit and came to this video. You followed the same logic I did, but then you informed me of that set rule. With my newfound knowledge I went back and finished the puzzle!

@ashnose 6 ай бұрын

Saaaame

@TheClawNinja 6 ай бұрын

The brilliant variety of the Sudoku puzzles on this channel never ceases to completely amaze me. At some point, there's nothing new, right?

@longwaytotipperary 6 ай бұрын

Evidently not - new stuff constantly 😄!

@nytheris2848 6 ай бұрын

As someone who is fairly new to variant sudoku and does almost exclusively 1 and 2 star puzzles, I found this incredibly difficult. Definitely not 1 star for difficulty, at least compared to most of the other puzzles I've done on LMG.

@xChikyx 6 ай бұрын

yeah, no way i can get that done at all as a 1 star

@Ardalambdion 6 ай бұрын

Simon can make sets out of about anything and compare them with each other.

@dkamm65 6 ай бұрын

It seems the video chapters are the ones from yesterday's video!

@thebitterfig9903 6 ай бұрын

I feel like the key to this one really is the set theory. It wasn't hard to figure out what goes into which cages in the double-cage regions, but there were so many pencil marks to disambiguate, and I feel like it really needed that set theory. The 4s were the only overlap digit in the two 8-cages, and once you have a few digits, it's easier to winnow down to pairs, and pairs intersect the other cages and things start to happen.

@F1r1at 6 ай бұрын

You can solve this without a set theory (I did in 26 minutes), but set theory, if you can spot it, makes it a little bit easier.

@francoisduez601 6 ай бұрын

21:52 It took me forever to think of the law of left-overs, which of course is very important for an irregular puzzle 🙉 After that it went quite fluently, very nice puzzle ! ❤

@jacko_g 6 ай бұрын

Favourite part of the video at 27:33, "four is very restricted"-in fact, the 4s couldn't possibly be more restricted... 😉

@longwaytotipperary 6 ай бұрын

😄

@mudscuffer 6 ай бұрын

😆

@KeimoKissa 6 ай бұрын

I was just solving another puzzle featured on your channel while watching Groundhog Day. Imagine my surprise when they started playing the CTC intro song :D how delightful

@michaeltritter2743 5 ай бұрын

What a great puzzle. I personally, being more a beginner, solved without the use of leftovers, so about the time of Simon delving into leftovers, I began using a layman's version of the logic that sujoyku explained ... in the lower right I postulated that 4 was 'probably' in the 8-sum cage to reduce the pairs that would result in a break, and to prove that, I placed it in the 9-sum box and considered what happened ... which immediately put the 5 in the 8-sum cage and from there was easy to see that no combination existed that didn't result in either the corresponding 8 or 9. The rest of the puzzle followed similar logic, both painful and satisfying. Very glad I saw it through.

@patrickweix8289 6 ай бұрын

30 min for me, I don't know how they ever came up with the rule set, but it is amazing it solves.

@srwapo 6 ай бұрын

24:37, took a bit to get in the groove of how to think about the clues, but it was neat how they played around the grid. Good thing I play random 7x7 cell irregular box sudokus from time to time, knew a few tricks for that part.

@michelebensa 6 ай бұрын

Another path in box “7” u could find the 1s in the 9 rellik cage, but if u then try tu put 6 in the 8 cage u can see that 3-4-5 can’t go in any combination in the 9 cage, from there some reasoning about 4s and the puzzle solve! Thery nice puzzle!!

@Ibrahim-jl6hi 6 ай бұрын

The way to complete region 7 after knowing that the 1 is in the 9 rellik cage is by thinking about where the 4 goes. If the 4 is in the 9 cage => 5 is in the 8 cage => 3 is in the 9 cage => 6 is in the 8 cage => 2 is in the 9 cage and now the 9 cage has a 234 triple inside of it. So the 4 has to be in the 8 cage and you can find the rest of the region from there.

@samueldeandrade8535 6 ай бұрын

Oh my God, I just loved those Rellik cages!

@katiekawaii 3 ай бұрын

This puzzle was so satisfying to solve. So good.

@dikinebaks 6 ай бұрын

This was an adorable solve.

@longwaytotipperary 6 ай бұрын

I really enjoyed this new rule se!!!

@easternbrown 6 ай бұрын

I saw that the bottom right block, once you've put the one digit in the nine cage, has two effective three cell cages with the non-total clue being wight. By considering the digit pairs which make eight and the digit pairs which make nine it's quite easy to pencil in the cages - there is only one way to keep everything separate that needs to be separate. You get 234 and 567 as the two groups, and obviously 234 can't be in the nine cage.

@EmonEconomist 4 ай бұрын

Took me 40:01 (though I think I left the meter running while I went to wash the dishes). A very interesting new ruleset! I hope we'll be seeing it again.

@eddieharwood7788 6 ай бұрын

Fabulous puzzle. Simon you are so quick - I was really struggling to get my head around the negative rule. I ended up watchin bits of your solve to get me past some impasses.

@grahamania 6 ай бұрын

00:22:23 for me. Wonderful puzzle! Normally smaller puzzles means less logic, but I thought the logic in this was quite fun :) Kind Comment.

@JPgreekgaming 6 ай бұрын

This is such a bizarre but brilliant ruleset! Very approachable and immensely enjoyable, Kudos!

@jdkemsley7628 6 ай бұрын

This puzzle speaks to me. It seems to say "ooo, well done!" after each one of my simple deductions. How could I not feel great after doing a puzzle like that?

@Vorash00 6 ай бұрын

The set theory explanation of the law of leftovers - something I knew long before finding this channel (but didn't know it was called 'the law of leftovers') makes me feel better about my inability to do set when performing sudoku - turns out I can and do have this ability! who knew!!! thanks Simon you made me feel a little be more intelligent than I gave myself credit for!

@F1r1at 6 ай бұрын

Yeah, you could do region 7 at the very start, actually. It's quite easy if you think about 36 pair in a 9 cage. If you put 3 in a 9 cage, then you'll need to put 2 here as well because of 6 in the 8 cage. Then 2+3+4 = 9 and 3+5+1 = 9, neither of 45 pair could be in the cage, so the digit that is in the cage is 6. Then 5 is also in that cage because of 3 in the 8 cage and 7 is in the 9 cage, because of 6+1+2 = 9. I believe that miss made the puzzle much more complicated for you. Cause after 1567 in the 9 cage you can place all 4s in the grid.

@juin9401 6 күн бұрын

17:45 A fun one for me. It's so funny that I need to spot a sudoku trick in a sudoku puzzle🤣

@Gonzalo_Garcia_ 6 ай бұрын

6:36 for me. Fun puzzle!!

@six_5000 6 ай бұрын

59:23 for me… got stuck for about twenty minutes before I realized I had pulled a Simon by not finishing the logic in the area I was working on before moving on to somewhere else 😂

@psiphiorg 6 ай бұрын

Interesting puzzle! I was a bit slow to find the logic that helped place digits inside or outside certain cages. Once I had that "aha!" moment (a great feeling!), I was able to make a lot of progress. My time today was 26:52, solver number 528.

@penningmeestercgkdelft9159 6 ай бұрын

Solved it in 41:30 :-) Loved this new ruleset! The most flexible arithmetically wrogn cages ever. :-) And as there are no 3's in corners, we are not losing our Rellikion tonight.

@themiikahyytiainen 6 ай бұрын

Enjoyed this very much, and was rather pleased with my 40 min result (including one stupid mistake and semi-reboot). Definitely did a lot of combinatoric on paper. I don't understand why CTC are so dogmatically against any extra notes.

@markp7262 6 ай бұрын

16:33 finish. This was a fun puzzle, and not too difficult. I'd be interested in seeing a 9x9 version of it sometime. Excellent! And the shape? That would be an open inverted comma, or open single quotation mark.

@SomethingWellesian 6 ай бұрын

Hit a wall on this one, so glad to see a solution. Wonder if I missed something obvious. I might have another crack at it.

@TurquoizeGoldscraper 6 ай бұрын

43:50 for me - it took 15 minutes to get my first digit, and a few minutes later I got stuck for 15 minutes.

@XenophonSoulis 6 ай бұрын

Awesome puzzle. Not too hard (it took me 64 minutes), but interesting until the last digits. I loved the logic with the lonely 8 and 10 cages.

@ghosttwo2 6 ай бұрын

I just realized that any NxN grid can be divided into N regions of size N. It's super obvious now, but I just never had reason to consider the general case.

@MissKapanadze 6 ай бұрын

The way I went about the 10 and 8 cages was to focus on the digits that didn’t have a pair (5 and 4 respectively) and what would happen if they were excluded from the cage. For example, what happens if 5 is not in the 10 cage? 1+2+3+4 = 10, so it needs at least 1 number higher than 5. If we pick only 6 as the high digit, we need to exclude 4, so now we’re left with 1236, where 136 adds to 10. If we pick 7 as the high digit, then the we need to exclude 3, so we’re left with 1247, where 127 sums to 10. If we pick both high digits, then 34 are excluded and we’re left with 1267 which breaks again due to 127 triple. Therefore there must be a 5 in the 4-cell 10 cage. Similar logic applies with 4 in the 8 cages.

@PleegWat 6 ай бұрын

In the bottom right, once the 1 is in the 9 cage you know you cannot have a set of digits excluding 1 which adds up to 8 anymore. So you get split pairs 2/6, 3/5, and 4/7. I'm not sure if that gets you anywhere though.

@anaayoung9142 6 ай бұрын

Another new rule that started "easy"... but soon we will get the hardcore version of 1 and half hour + in a Simon's video 😅

@trudain 6 ай бұрын

32 mins for me. Thanks.

@karlmortenlunna2417 6 ай бұрын

11:39 for me. Nice puzzle!

@frankjiang1857 6 ай бұрын

Finished in 25:13. Really interesting ruleset which took a while to get my brain wrapped around. Though I kind of brute forced all the possibilities for the Rellik cages as I don't know if there's a really intuitive way to figure out what they can be without going through the possibilities. Once you get to a certain point, everything falls in place pretty quickly, but it's a struggle up to that point. Very fun puzzle!

@titusadduxas 6 ай бұрын

1:13:11 - I got going very quickly but ground to a halt for about half an hour before I spotted the fairly obvious disambiguator in the bottom right 9 cage.

@LednacekZ 6 ай бұрын

12:51 for me. it was fun and something new.

@pwfd 6 ай бұрын

My reasoning for the 9/8 region: you have the 1 that must go into the 9 cage, and the other pairs that make up 9 have to be divided into both cages 27, 36, 45… 2 cant go with 6 ever because the 9 cage has a 1 already, so 2 goes with 3 in whichever cage it goes, because if 2 goes with 6 either cage will break… the third digit from that group cant be 5 because 35 will also break in both cages so 234 and 567 are the groups, 234 is 9 so 567 go with 1 in the 9 cage and 234 go in the 8 cage

@mudscuffer 6 ай бұрын

First time seeing Rellik Cages, that was really interesting. 20:05 for me

@eve_the_eevee_rh 6 ай бұрын

11:56 really fun! I like this one

@chocolateboy300 6 ай бұрын

I almost gave up on this puzzle as I got stuck and could make no progress. I finally found that r3c6 always had to be a 4 due to the 9 cage restricting box 3. That one was tough to find for some reason. I ended up getting 104 minutes.

@JalebJay 6 ай бұрын

11:05. Fun with anti partitions

@penningmeestercgkdelft9159 6 ай бұрын

Is there a slight error in the chapter subdivision of this video, by the way? e.g. The Let's Get Cracking moment is already quite early in the Rules chapter, just after the birthdays. Is this perhaps a bug that could be easily fixed afterwards?

@krtwood 6 ай бұрын

Yeah it's just a list of times in the description box, easy fix.

@piarittersporn 6 ай бұрын

What a funny puzzle.

@erickehr4475 6 ай бұрын

15:04 for me. It wasn’t hard, but I wouldn’t say it was 1 star difficulty either.

@andreasvox8068 6 ай бұрын

Can't wait for pizzer-lines and elcric constraints...

@SkillZgetKillZ 6 ай бұрын

got a time of 37:37 not particularly fast, just an interesting time to get cause 3 and 7 were my lynch pins for this puzzle

@antoniolopezmanito3511 6 ай бұрын

30 minutes trying this puzzle this afternoon and got not a single clue. I'm still too newbie on this...

@longwaytotipperary 6 ай бұрын

Keep at it!!

@Rach881101 6 ай бұрын

23:13 for me. Brilliant puzzle!

@Mujaki 6 ай бұрын

By the by, the time-stamps in the timeline are (at the time of writing this comment) not properly aligned with the events in the video. There is no poem about Doppler Effect, but none-the-less it is stretching out the time!

@sacredsock8031 6 ай бұрын

Interesting new rule, imagine what happens when we get a 4 or 5 star puzzle?

@user-kt9vr1wj6y 6 ай бұрын

27:47 for me nice puzzle

@StefanNoack 6 ай бұрын

It is very important to not think too much about where to put 8 and 9 in this puzzle 😂

@Orenotter 6 ай бұрын

In honor of irregularity, My meter shall see some disparity. Instead of 3/3/ 2/2/3, you see, I'm breaking the whole darn rhythm for the sake of increased hilarity.

@ZaidK_ 6 ай бұрын

The logic at 22:15 was a bit off, wasn't it? The blue are orange cells do not have to be the same, only their sums do. Technically the orange cells could've been 4 and 5 and blue 3 and 6. Sure, if you look at the overall context of r4, they have to be the same. But I wonder if Simon overlooked it or just didn't bother elaborating.

@MichaelDarrow-tr1mn 5 ай бұрын

No they couldn't. If it were, then either the first 3 rows would have not enough 3s or the first 3 boxes would have too many 3s.

@YellowBunny 6 ай бұрын

It took me 22:41.

@Landis963 6 ай бұрын

55:40!

@lasagna312 6 ай бұрын

Got this one in 28:50. I found it quite difficult, I would not call this one star.

@jongurney3810 6 ай бұрын

Yes wonderful puzzle & fun ruleset, but... this simply isn't 1*. I feel sometimes that hardcore solvers on LMG are way under-rating puzzles so the * don't really mean much to us mortals.

@Poet13xRatedRKO 6 ай бұрын

17:26 for me.

@_-_-Sipita-_-_ 6 ай бұрын

14:28 for me.

@MarkBennet10001 6 ай бұрын

I don't believe that is a 1*/5 puzzle - grade deflation reigns

@iuriikononenko9238 6 ай бұрын

Looks like incorrect timemark placed - rules time finishes few minutes later than the beginning of the solve. Also noted that box 7 sets of digits can be deduced from the very beginning.

@jakeharrison7840 6 ай бұрын

at about 21 minutes why didn't you do sudoku canceling row 7 column 5 then you would get a 6 in that area.

@D0rus 6 ай бұрын

Yuk, the chapters on this one all seem to be shifted or something. Happy birthdays is actually rules, rules is actually starting to solve etc.

@gunrugger 6 ай бұрын

your timestamps are off ❤

@johnnyw4life 6 ай бұрын

Wow Im early 😮

@darksiders112 6 ай бұрын

Great puzzle, but calling this a 1 star difficulty is completely ridiculous, I've done plenty of 3 star puzzles that I've solved quicker than this

@victorfinberg8595 6 ай бұрын

let's be clear on something: 1 star on LMG is NOT "genuinely approachable", and frequently means "not for beginners"

@victorfinberg8595 6 ай бұрын

so, how does it work in THIS puzzle? 1) the first 2 regions are fine. 2) by the time they get to the third region (12:00), the beginner has no recourse except to do a brute force listing of all (there are about 15) possibilities, and examining them for conflicts. at this point, the beginner loses patience. 3) then it gets harder. while it is still reasonably possible to do more brute force lists of a couple more regions, it gets even harder after that, and no results have yet been obtained. even the most stubborn beginner now walks away. and what happens overall? the beginner goes back to LMG, and tries another one-star difficulty puzzle, and again is unable to make any progress. and now the beginner concludes that this great archive of sudoku puzzles has a big red flag "beginners, go away". and while that is NOT the INTENTION, it is the RESULT.