What Is Sudoku?

Sudoku is a logic-based number puzzle played on a 9×9 grid, divided into smaller 3×3 boxes. The goal is to fill every square so that each row, column, and box contains the numbers 1 through 9—without any repeats. It’s not a math game; instead, it challenges your ability to spot patterns and apply logic.

How to Play Sudoku – The Sudoku Rules

To enjoy Sudoku, you only need to follow a few simple rules. The challenge lies in applying them with logic until the 9×9 grid is fully solved.

• The grid: A Sudoku puzzle has 81 cells on a 9×9 board, arranged into rows, columns, and nine 3×3 boxes.
• The goal: Place the digits 1–9 so they appear exactly once in every row, column, and box.
• Fixed numbers: Some digits are given at the start as clues and cannot be changed. These act as the foundation for solving.
• The method: Each puzzle has one unique solution that can be reached through logic alone—guessing is never required.

Easier Sudoku levels provide more starting digits to guide you, while harder puzzles reduce the clues, forcing deeper strategies and sharper focus.

Improve Your Skills with Logic Techniques

Once you’re comfortable with the rules, you can explore techniques like "Last Free Cell," "Obvious Singles," and "Notes in Sudoku" to solve puzzles faster and with more confidence. Browse our full collection ofSudoku strategies to take your skills to the next level.

Looking to practice? Try our online Sudoku puzzles anytime—no download needed. Whether you want a relaxing break or a mental challenge, Sudoku is the perfect daily habit.