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
- Each row must contain all of the digits from 1 to 9, with no repetitions
- Each column must contain all of the digits from 1 to 9, with no repetitions
- 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.
- If 2 digits are separated by a knight's move in chess, then they cannot be the same
- If 2 digits are separated by a king's move in chess, then they cannot be the same
- 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.
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When you're so shonen-pilled that you literally imagine Dishwasher cleaning as the final arc of an anime.
I even had a plucky protagonist that no one has any expectations for. A glass bottle with oil stains so stubborn I couldn't remove them with a steel scrub.
Combine the main protagonist with a red colored sponge, a bottle cleaning stick, soap and the metal scrub, you have your 5 man cast.
The metal scrub is the mentor travelling with the group. "Trains" the protagonist (removes some, but not all the oil stains), then is sidelined shortly after.
The bottle cleaning stick is the comic relief character. Does not help, but provides emotional support.
The soap is the unsung MVP.
And obviously the final arc consists of the deuteragonists (sponge and bottle) discovering the power of friendship (soaking up water from sponge, then putting it in the bottle) to defeat the enemy (the leftover water stuck in the dishwasher after rinsing it).
I even had a last minute death, fakeout/drama scene. Where I accidentally dropped the sponge in the hole and cannot retrieve it, except by using the magical artifact (tweezers).
Outside the main cast, you also have the
I am going insane