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
    4·
    23 hours 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)

Wmill (10/27 - 11/2)

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

  • sodium_nitride [she/her, any]@hexbear.netOPEnglish
    3·
    1 hour ago
    CW: Joy killing

    My mom has actually figured out I am genuinely unhappy being with my parents despite my efforts to hide it. She confronted me about it and I was just, stumped. Didn’t want to admit it, but my silence spoke volumes.

    My little brother is in a terrible mood these days and doesn’t respond well. He also has too many temper tantrums which drain the emotional energy of the family.

    My dad, I just feel sorry for him, he seems to be a struggling with a family that doesn’t kinda care about him.

    Yeah, I’m remembering now why I was so eager to leave, and why I had to leave before my relationship with my parents healed.

    I know I shouldn’t blame myself, but me being trans and repressing (then hiding) it for 10 years at this point has driven the family to dysfunction. It’s just a fact. Any hope for a healthy family dynamic is permanently dead. And I don’t feel at all like I ever want to come out to my parents, not because I’m even afraid anymore, but because the emotional disconnect is irreparable.

    Also, I will just say it. I’ve grown up to be a nihilistic, sadistic and self-loathing type of person. And I say none of that in a romanticised way. I’m niethzche’s last man (or last woman) (I refuse to spell that fascist’s name correctly)7

  • 0x2640 [pup/pup's, she/her]@hexbear.netEnglish
    9·
    15 hours ago

    okiiiii there was some trans gaym about like… the mc just waking up one day with an alien or something in her chest and the art was like amazing and we cannot remember the name of it at allllll so if that rings a to anymany can u tell us what gaym that issss…

  • BountifulEggnog [she/her]@hexbear.netEnglish
    5·
    21 hours ago

    I’ve been trying to play more 3min blitz chess because that’s the time control we play at work and I fucking hate losing on time. One game I literally had mate in 1 and time failed. This last game I had mate in 2 and he had 7 seconds, like that’s just garbage. Chess is not a game of speed ohnoes

  • sodium_nitride [she/her, any]@hexbear.netOPEnglish
    15·
    1 day ago

    Gender affirming inconvenience?

    I went outside without a bra by accident. Had to literally hold up my boobs while running down the stairs to prevent them from bouncing. Was a very awkward walk to the supermarket with my little brother who doesn’t know I’m trans*. I had to hold up the shopping bag and umbrella strategically to cover up.

    Sometimes, I feel like you could make a sitcom out of my life.

    *Although I have been dropping incredibly subtle hints in the form of LGBT memes. It is a good sign that he responded positively, but that little fucker can’t keep his mouth shut, so I’ll keep my mouth shut instead.

  • sodium_nitride [she/her, any]@hexbear.netOPEnglish
    8·
    1 day ago

    Played a game of chess with my brother (who is pretty old). Feeling good about my overwhelming victory doggirl-smart.

    I lost a Knight and a pawn, while he lost every piece other than a single Bishop.

    These aren’t the casualty ratios of war. This is more like I launched a nuclear bombardment campaign at my brother’s “kingdom” and lost a small amount of forces in the mop up operation afterwards to isolated bandit/post apocalyptic survivors.

  • Wmill [they/them, fae/faer]@hexbear.netEnglish
    8·
    1 day ago

    Self study is difficult, doing a thing where I’m trying to figure out what I don’t know and studying that. Got a book on HVAC and instead of feeling like a smarty pants happy with what I know struggling with what I don’tyamcha I set myself a monumental task so I can have some slack, wanna become an HVAC elite so need to fully understand 6 categories of the field

  • musicenjoyer [it/its, xe/xem]@hexbear.netEnglish
    6·
    1 day ago

    am so bad w time isaac-cry . More below

    spoiler

    Time goes by so fast I often don’t know what time it is . I want to discuss getting tested for ADHD with my therapist but I feel it’s going to be the usual saying that I don’t know everything about this topic. Even with passionate interest I’m finding it hard to focus on one thing without forgetting about it entirely or getting on track a few hours later. Even if I break things down into small parts, try setting alarms I still find it hard. Doesn’t help that am hyperactive most of the time, I feel like I constantly have to stim.

    family-guy-death-pose