# How To Solve Sudoku Puzzles

Sudoku is generally played on a grid of 9 x 9 spaces. There are other variants of Sudoku with smaller and larger grids.

Each puzzle contains rows, columns, and squares.

## Rows

Each row (shown in red) must contain numbers 1 to 9 with no repeats. There are nine rows in the grid.

## Columns

Each column (shown in red) must contain numbers 1 to 9 with no repeats. There are nine columns in the grid.

## Squares

Each square (shown in red) must contain numbers 1 to 9 with no repeats. There are nine squares in the grid.

A Sudoku puzzle will provide some of the numbers for you already.

To complete the puzzle, fill in the empty spaces in each row, column, and 3x3 square with numbers from 1 to 9 with no repeats.

## Solution

Sudoku puzzles come in varying levels of difficulty. Several factors determine the difficulty of a puzzle. Generally speaking, the number of logical decisions and techniques required to complete the puzzle makes the puzzle more or less difficult. Easy puzzles can usually be solved quickly by scanning the row, column, or square for missing numbers. As puzzles get more difficult, more logical decisions are required, and less immediately solvable clues are available.