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What is Sudoku?

Sudoku is a logic puzzle where you fill a 9×9 grid with numbers from 1 to 9. Originating from Japan, this game has spread worldwide and is excellent for brain training.

Basic Rules

Sudoku follows three simple rules:

1. Rows: Each row must contain 1-9 exactly once
2. Columns: Each column must contain 1-9 exactly once
3. 3×3 Boxes: Each 3×3 box must contain 1-9 exactly once

Beginner Solving Techniques

1. Scanning

The most basic technique. Find positions where a specific number can go.

Method:

1. Select a number (e.g., 1)
2. Check all rows and columns
3. Find empty cells where that number can go

2. Naked Single

When only one number can go in an empty cell.

Method:

1. Select an empty cell
2. Check numbers in the same row, column, and box
3. If only one number is possible, enter it

3. Hidden Single

When a specific number can only go in one position within a row, column, or box.

Example:

• If 7 can only go in one cell in a box
• Other positions are excluded because 7 exists elsewhere
• Enter 7 in that cell

Recommended Solving Order

1. Start with easy numbers: Begin with frequently appearing numbers (5+ occurrences)
2. Full areas: Focus on nearly complete rows, columns, or boxes first
3. Use intersections: Focus on points where rows and columns meet
4. Chain reactions: Filling one cell often solves others

Common Beginner Mistakes

1. Guessing: Sudoku is a logic game. No guessing!
2. Focusing on one area: You need to see the whole puzzle
3. Not taking notes: Noting candidate numbers makes it much easier
4. Not checking: Always verify row, column, and box before entering

Practice Tips

Difficulty Selection

• Easy: 30-35 numbers given
• Medium: 25-30 numbers given
• Hard: 20-25 numbers given
• Expert: 17-20 numbers given

Beginners should start with Easy!

Start Without Time Limits

Don't rush at first. Accuracy comes before speed. You'll naturally get faster with practice.

One Puzzle Daily

Solving one puzzle daily leads to rapid improvement.

Benefits of Sudoku

• 🧠 Improved logical thinking
• 🎯 Enhanced concentration
• 😌 Stress relief
• 📱 Available anytime, anywhere

Conclusion

Sudoku may feel difficult at first, but once you learn the basic techniques, you'll quickly find it enjoyable. Try various difficulties in Elyfora's Sudoku game!