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How to Play Sudoku: Detailed Rules and Complete Guide
sudoku100 PC version screenshot
🎮 Choose difficulty to start immediately:
Choose difficulty to start playing
What is Sudoku? (30-second understanding)
Sudoku is a 9×9 logic number game.
The goal is simple:
Fill in the blank spaces with numbers 1–9, and:
- No repetition in each row
- No repetition in each column
- No repetition in each 3×3 box
Sudoku is not a math problem, it's a logic puzzle.
Each number can only appear once in a row, column, and box.
How to play Sudoku? (3 quick steps)
Step 1: Look for rows or columns with the most numbers
Prioritize observing positions with the most numbers, which makes reasoning easier.
With 8 numbers already present, the missing one must be the only possible number.
Step 2: Use elimination
Look at an empty cell:
- What numbers are in this row?
- What numbers are in this column?
- What numbers are in this box?
The remaining number after elimination is the answer.
After eliminating existing numbers, only one possibility remains.
Step 3: Loop reasoning, don't guess
Repeat the above process.
Sudoku doesn't require guessing, only logical judgment.
🎯 Got it? Give it a try now:
Start your first game nowChoose difficulty to start playing
- Beginner — Perfect for complete newcomers
- Easy — Suitable for beginners
- Medium — Logic enhancement
- Hard — Requires more reasoning
- Expert — Advanced technique challenge
- Extreme — Ultimate challenge
Supports hint function · Auto-check · Multi-device adaptation
What to do when stuck?
In Sudoku100 game, click the hint button to get real-time answers; as shown below.
If playing offline, open Sudoku Solver and take a photo with your phone to solve it.Sudoku100 AI will solve it step by step for you, supporting all sudoku types:
- Classic Sudoku
- Samurai Sudoku
- 16×16 Sudoku
- Asynchronous Sudoku
- Killer Sudoku
Automatically calculates complete solution steps
Want to finish faster? Learn advanced techniques
- Single Candidate Method
- Single Position Method
- X-Wing Technique
- Complete Guide to Advanced Sudoku Skills
Why choose us?
- 100% Free
- No Registration Required
- Auto-save Progress
- Multi-language Support
- Supports Phones and Tablets
- Includes Solving Tools
Frequently Asked Questions
How do you play Sudoku?
To play Sudoku, follow these steps:
- Look at each row, column, and 3×3 box.
- Identify missing numbers.
- Eliminate numbers that already appear.
- Fill in the only possible number.
Sudoku is a logic puzzle where numbers 1–9 must appear exactly once in every row, column, and 3×3 box.
👉 Start playing instantly: BeginnerWhat are the basic rules of Sudoku?
The basic rules of Sudoku are:
- Each row must contain numbers 1–9 without repetition.
- Each column must contain numbers 1–9 without repetition.
- Each 3×3 box must contain numbers 1–9 without repetition.
These three rules define the entire game.
Is Sudoku hard for beginners?
Sudoku is not hard for beginners if you start with easy puzzles.
Most players learn the rules within 10 minutes.
Most players learn the rules within 10 minutes.
Beginner mode includes more given numbers, making it easier to solve.
Do you need math skills to play Sudoku?
No. Sudoku does not require math skills.
It is a logic-based puzzle, not a calculation problem.
It is a logic-based puzzle, not a calculation problem.
What is the fastest way to solve Sudoku?
The fastest way to solve Sudoku is:
- Start with rows or columns that have the most numbers.
- Use elimination.
- Fill in single candidates first.
- Avoid guessing.
Advanced techniques like X-Wing help with harder puzzles.
Start your first Sudoku game now
No registration · Free online · Play on mobile
