# International Sudoku Day 2021: history and meaning; know how to celebrate this day

We all must have played Sudoku once in our life. This is a game for filling a 9×9 grid so that each column, row and 3×3 sub-grid contains all the numbers from 1 to 9. So the nine-nine is the natural choice for the day of the celebration. Every year on September 9, the world celebrates International Sudoku Day.

So now it’s time to get your brain started, for today is the most definite cause of celebration.

Sudoku is made up of a grid of small boxes called cells, stacked nine high and nine wide, totaling 81 cells. This is a logic-based number placement puzzle called Sudoku. It is based on a number puzzle called Latin Squares. Players fill in each row, column and square with the numbers 1 through 9.

Numbers cannot be repeated in a row, column, or square. It already contains numbers, which makes the game easier to play.

### Story

An 18eSwiss mathematician Howard Garns developed this game and in 1895 this game was first published in a French newspaper.

Garns is a freelance puzzle inventor, and he called the game Number Place. In 1979, Number Place first appeared in “Dell Pencil Puzzles and Word Games” magazine.

In 1984, the game appeared in Japan. There they called it Sudoku, which means “numbers are limited to one occurrence”. Since the Japanese language does not work well for crosswords, number games are much more popular there.

A New Zealand judge by the name of Wayne Gould reintroduced this puzzle game to the Western world in 1997. In 2004, The Times of London and the Conway Daily Sun of New Hampshire began publishing Sudoku puzzles. Since then, Sudoku has become a worldwide phenomenon.

In 2013, the World Puzzle Federation made September 9 the official International Sudoku Day and we’ve been celebrating it ever since.

### How to celebrate this day?

1. Challenge your friend to play Sudoku puzzles This game does not have to be a one person game. You can challenge your friend to compete with you. Take the challenge to solve the puzzle in the fastest way.

2. Solve Sudoku on your own There is definitely no better way to solve puzzles on your own than to play with someone else. Take the challenge to solve a puzzle in a limited time.

3. Buy new puzzle books Go out and buy some new puzzle books. Look for good books that will make your day interesting.