The Sudoku puzzle format consists of (usually) a 9 by 9 grid that must be filled with numbers. The classical Sudoku rules are as follows

  1. Each row must contain all of the digits from 1 to 9, with no repetitions
  2. Each column must contain all of the digits from 1 to 9, with no repetitions
  3. Each sub square (3x3 grids marked by bold lines) must contain all of the digits from 1 to 9, with no repetitions

The historical inspiration of Sudoku begins with the Latin square, a type of grid problem similar to Sudoku in that it consists of an N by N grid where N digits (or letters) must be arranged in accordance with rules 1 and 2 of Sudoku (the sub square had yet to be invented). The first known example of a 9 by 9 Latin Square is from a monograph over 300 years ago, written by the Korean mathematician Choi Seok-Jeong. However, the Latin Square was popularized in the west by the legendary mathematician Leonhard Euler, who independently invented it almost 70 years after Choi Seok-Jeong.

According to Christian Boyer (idk who this is), on July 6th, 1895, the french newspaper La France published the earliest known example of a “true” Sudoku puzzle following all 3 rules of modern Sudokus, although french newspapers had previously been publishing similar (but different) puzzles prior. The name “Sudoku” itself (meaning “single digit”) comes from Japanese magazines in which the game was popular during the 80s and 90s.

In Modern times, the Sudoku puzzle scene has been blessed with the addition of numerous variants, that add on additional rules, elevating the puzzle. The puzzle in the provided image is one such example, known as the “miracle Sudoku”. It comes with 3 additional rules on top of the 3 original.

  1. If 2 digits are separated by a knight’s move in chess, then they cannot be the same
  2. If 2 digits are separated by a king’s move in chess, then they cannot be the same
  3. If 2 digits are adjacent (left, right, down or top, none of the diagonal directions), then they cannot be consecutive (ex - 5 and 6, or 7 and 8)

As can be seen from the fact that only 2 digits have been provided to start with, modern Sudoku authors are big fans of making puzzles that appear to be impossible to solve. This of course, is my favorite part about modern Sudoku. If you want to try to solve the miracle Sudoku, here is the link.

Some of the other example variants add new rules, such as German whispers, Dutch whispers, Renban lines, Entropy lines, Thermometer lines, killer cages and many more. You can find a massive collection of these puzzles on the logic-masters website.

Join our public Matrix server!

https://rentry.co/tracha#tracha-rooms

As a reminder, please do not discuss current struggle sessions in the mega. We want this to be a little oasis for all of us and the best way to do that is not to feed into existing conflict on the site.

Also, be sure to properly give content warnings and put sensitive subjects behind proper spoiler tags. It’s for the mental health of not just your comrades, but yourself as well.

Here is a screenshot of where to find the spoiler button.

  • gaystyleJoker [she/her]@hexbear.netMEnglish
    3·
    1 day ago

    hi, does anyone wanna make the mega in the upcoming weeks? if so, reply to this post and i’ll add you to the list!

    the list as it stands:

    peanutbuttercupola* (7/21 - 7/27) 
oscardejarjayes* (7/28 - 8/3)   
BountifulEggnog* (8/4 - 8/10)
Seryph (8/11 - 8/17)
Shaleesh (8/18 - 8/24)
GayTuckerCarlson* (8/25 - 8/31)
Eco* (9/1 - 9/7)
nemmybun (9/8 - 9/14)
Disaster_of_Passion* (9/15 - 9/21)
Carcharodonna* (9/22 - 9/28)
sodium_nitride* (9/29 - 10/5)

    ​ * after name denotes someone who has posted before and will be skipped by first-time posters

  • Demifriend [she/her]@hexbear.netEnglish
    8·
    4 hours ago
    Update on my job shit if anyone cares

    I spoke on the phone with the HR rep and my walking out of the meeting was considered abandoning my post or something and so as far as the company is concerned I have quit and that was my last day. I’m gonna push for unemployment anyways but idk if there’s anything I can do about it. I’m feeling really depressed about it ngl, I didn’t like my job at all recently but I still did a good job and would have stuck around if they didn’t effectively force me out. I hope I can find a new job soon.

    • segfault11 [any]@hexbear.netEnglish
      6·
      3 hours ago

      managers are naturally occurring portapotties the “”“”““law””“”“” prevents real humans from using

  • Wmill [they/them, fae/faer]@hexbear.netEnglish
    3·
    4 hours ago

    no-copyright lost world could have been the third storybook game, same team that made the secret rings and black knight minus the main director/writer Maekawa. So the setting would have been ancient Greek pantheon which would have been cool ngl way better than the soft reboot lost world tried to be (headcanon). Still know what would have been cooler, the other possible settings they were considering like wild west or fucking lovecraftian setting. We were hard robbed on something amazing kiryu-pain

  • TerminalEncounter [she/her]@hexbear.netEnglish
    7·
    6 hours ago

    Went to Seattle, watched MCR, it was kick ass! I was so happy with how much trans pride there is there!

    Had to use a burner phone, going to the states feels pretty fraught 😬. The customs guy was fine, guess it helped that I was going to a concert and leaving shortly after.

      • TerminalEncounter [she/her]@hexbear.netEnglish
        4·
        5 hours ago

        There have been people turned away for memes on their phones, there are currently Canadian citizens held in ICE detention facilities on seemingly spurious grounds or for things that wouldve normally led to regular deportation, and our government advice has been dont fuck around and just take a burner phone when crossing the border, plus America has some shitty attitudes towards trans people especially when held in detention. Saying that, plenty of people have gone without issue and you dont hear about all the cases like mine where everything was fine

        Technically, as a member of communist party, I am also ineligible to immigrate~ Cant remember if that’s only for permanent residency/citizenship or if it also applies to temporary residents (like me when I went just to visit and tour)

  • squirrels [she/her]@hexbear.net
    11·
    11 hours ago

    Today I told some people I’m trans for the first time, and it went really well. They were truly all so supportive and wonderful and I feel so deeply lucky to have them as friends. It still doesn’t really feel real. Like, part of me doesn’t believe it actually happened. Maybe that’s because I got kinda drunk to do it, who can say?

    It’s scary too. Having a space where I can be a woman makes beginning to transition feel actually possible, but it’s also overwhelming. I barely knew how to shop for men’s clothes, let alone women’s. Finding a doctor, starting hrt, I have no idea what that looks like or even what my goals for that are, really. I still want to do it all though.

    suicidal thoughts, transphobia

    Yesterday, I felt seriously like killing myself for the first time. Not nearly as fun a first time as the other one. Despite being majorly depressed for most of my life I was lucky enough to never struggle with suicidal thoughts before. It was the article about the draft UN report talking about the “international push to erase women” and “socially contagious” gender dysphoria. Honestly embarassing that such boring, unoriginal shit from the UN of all fucking places is what did it. I will simply choose to believe it was more from the stress of preparing to tell people.

    I don’t usually post things online, it feels nice. Like journalling, but maybe some other people will read it too.

  • Alisu [they/them, she/her]@hexbear.net
    7·
    11 hours ago

    I’m goin to search for trans resources in my country. Getting only stuff for Europe and US fucking sucks, I can’t really get anything shipped here from any sources. Getting a prescription is going to take too long tho. I want booba…

  • other_platypus [she/her, pup/pup's]@hexbear.netEnglish
    7·
    11 hours ago

    I’ve been reading Devon Price’s “Laziness Does Not Exist” and it has been challenging and life changing. I am now refusing to feel guilty for taking breaks at work, even hours at a time, for feeling like if I’m not moving my mouse I’m not being productive, and for blaming myself when solutions don’t appear in front of my face when I want them to.

    It helps that work has been unbelievably dysfunctional the past month or so (before that too, but there’s definitely been a recent rampup), since it pushed me to the point where something needed to change.

    details about that

    Today, I am quiet quitting for the day. I have a meeting that is possibly going to devolve into people being very angry at me for decisions made and poorly communicated by other people, who should be the ones making decisions, and who are on vacation. 4 days from a massive release and I’m still fighting with people over the stupidest shit and they all think they are in charge. My boss is beyond useless and is one of the people throwing a tantrum at me, but these aren’t my decisions, I’m just implementing them.

    I feel like at this point I am a lightning rod for all of these bad decisions and that everyone is taking it out on me. I can’t help but think that they all think they’re smarter than me and would have totally done things differently in my place. It’s not fair to me and no amount of money is worth this kind of mistreatment.

    I hope I get laid off, maybe I’ll get decent severance, but since it’s possible everyone is turning on me, it sounds like maybe I’ll get fired instead. Either way, it’s not worth my physical or mental health, so I’m trying my best to not push beyond my capacity.

  • GenderIsOpSec [she/her, kit/kit's]@hexbear.netEnglish
    7·
    12 hours ago

    blood levels are looking good with 690pmol/L for E and 0.7nmol/L for T. trans-hydra

    hate how having to do conversions for this shit is necessary since every fucking clinic seems to use a different measurements to calculate the levels. will probably up the E a bit to get over the 730pmol/L to be in monotherapy range and safe from the T-virus party-parrot-science