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.

Basic Sudoku Rules

Whether you’re new to the game or coming back after a break, these are the core sudoku rules you need to follow:

• Each row must contain numbers 1 to 9, without repeats.
• Each column must contain numbers 1 to 9, without repeats.
• Each 3×3 box must also contain 1 to 9, used only once.

Some numbers are already placed on the grid to help you get started. Your task is to use logic—not guessing—to complete the rest. Easy puzzles have more clues, while hard ones require deeper strategies.

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.