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What is Sudoku?
Sudoku is a logic-based, number-placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 boxes (also called cages) contain the digits 1 through 9 only once.

The puzzle initially starts with some of the digits already placed in the grid. The object is to fill in the rest of the grid according to the following rules:

All of the digits in a row or column must be unique.

No two digits can occur in the same box.

Digits cannot be repeated within a row or column.

The puzzles can be solved using logic alone. No calculations are necessary.

Sudoku puzzles are popular because they are easy to learn but can be challenging to solve.

Sudoku Rules and Sudoku History
Sudoku is a logic-based, number-placement puzzle. The game is played on a 9×9 grid, divided into nine 3×3 boxes. In the game, the player must fill each row, column, and box with the numbers 1 through 9.

The game Sudoku was invented in 1988 by Howard Garns, an Electrical Engineer from the United States. The game was patented in the United States in 1989. The game appeared in the Japanese puzzle magazine Nikoli, where it was known as Sudoku, meaning “single number”. The game became popular in Japan, and in 2004, it appeared in the United States.

The basic rules of Sudoku are simple. The player must fill each row, column, and box with the numbers 1 through 9. However, the challenge of the game comes from the fact that each number can only appear once in each row, column, and box.

There are many strategies that can be used to solve Sudoku puzzles. Some people use pencil and paper to solve the puzzles, while others use software or online tools. There are also websites that offer online Sudoku puzzles, with different levels of difficulty.
Conclusion
Sudoku puzzles are a type of logic puzzle that is popular around the world. The puzzles are usually a 9×9 grid with a total of 81 squares. The goal of the puzzle is to fill in the squares with the numbers 1-9 so that each column, row and 3×3 box has the same number of instances of each number.