How to Play Sudoku
Sudoku is a logic-based number puzzle that's easy to learn but challenging to master. This guide will teach you everything you need to know to start playing.
The Basic Rules
Sudoku is played on a 9×9 grid divided into nine 3×3 boxes. The objective is simple:
- Fill every row with the numbers 1 through 9
- Fill every column with the numbers 1 through 9
- Fill every 3×3 box with the numbers 1 through 9
Each number can appear only once in each row, column, and 3×3 box. Some numbers are already filled in (these are called "givens" or "clues"), and your job is to fill in the rest following these rules.
Getting Started
1. Scan the Grid
Look at the entire puzzle before making your first move. Identify which numbers appear most frequently and which areas have the most clues.
2. Start with Easy Cells
Begin by filling in cells where only one number is possible. Look for rows, columns, or boxes that are almost complete—these often have obvious answers.
3. Use the Process of Elimination
For each empty cell, mentally go through numbers 1-9 and eliminate those that already appear in the same row, column, or box. Often, only one number will remain.
4. Look for Patterns
As you progress, you'll start to recognize patterns and develop strategies for more complex situations.
Common Beginner Mistakes
- Guessing: Sudoku should be solved using logic, not guessing. Random guesses can lead to unsolvable situations.
- Rushing: Take your time to carefully consider each move.
- Not checking work: Regularly verify your entries to catch mistakes early.
- Ignoring boxes: Remember to check the 3×3 boxes, not just rows and columns.
Tips for Success
- Start with easy puzzles to build confidence
- Use pencil marks (or our hint feature) to track possible numbers
- Focus on one number at a time across the entire grid
- Take breaks if you get stuck—fresh eyes often spot solutions
- Practice regularly to improve your skills
Frequently Asked Questions
Is there a specific strategy for beginners?
Yes! Start by scanning the grid for rows, columns, or 3x3 boxes that are almost full. These are the easiest places to find missing numbers.
Do I need to guess numbers?
No, Sudoku is a game of logic, not guessing. There is always a logical reason for where a number goes. Guessing usually leads to mistakes.
What happens if I make a mistake?
If you put a wrong number in, you might reach a point where the puzzle becomes unsolvable. It's best to check your work frequently or use pencil marks.
Can I play Sudoku on mobile?
Absolutely! Our website is fully responsive and works great on all mobile devices and tablets.
Ready to Play?
Now that you know the rules, it's time to put your knowledge into practice! Start with an easy puzzle and work your way up.
Start Your Sudoku Journey
Learn More
- Sudoku Tips & Strategies - Advanced solving techniques
- What is Sudoku? - History and background
- Daily Sudoku - Practice with daily challenges