Sudoku is a popular number puzzle game that involves filling a 9x9 grid with digits so that each column, each row, and each of the nine 3x3 subgrids that compose the grid (also called "boxes", "blocks", or "regions") contain all of the digits from 1 to 9. The puzzle starts with some cells already filled with numbers, and the goal is to fill in the remaining cells while following the rules.

Here's a basic guide on how to play Sudoku:

Rules:

Grid: A standard Sudoku puzzle consists of a 9x9 grid divided into nine 3x3 subgrids.

Numbers: Use numbers 1 through 9 to fill in the grid. Each row, column, and 3x3 subgrid must contain all the numbers from 1 to 9 without repetition.

Starting Numbers: Some numbers are already filled in at the beginning. These are called "givens" or "clues."

How to Play:

Check Existing Numbers: Start by examining the initial numbers already given in the puzzle.

Fill in Empty Cells: Using logic and deduction, fill in the remaining empty cells with numbers from 1 to 9, ensuring that each row, column, and 3x3 subgrid follows the rules.

Elimination: Look for rows, columns, or subgrids where a number can only go in one place due to the existing numbers. This is often a process of elimination.

Use Pencil Marks: Some players use pencil marks to jot down potential numbers in the corners of empty cells, helping visualize possibilities.

Trial and Error: If you get stuck, you may need to try different numbers in a cell to see if they work. If a choice leads to a contradiction, you can backtrack and try a different number.

Patience and Practice: Sudoku puzzles can vary in difficulty. Beginners may find it helpful to start with easier puzzles and gradually work up to more challenging ones.