Sudoku Strategy & Solving Techniques

Learn how to solve Sudoku puzzles with our comprehensive collection of strategy guides. Whether you're a complete beginner or an experienced solver looking to master advanced techniques, we have tutorials for every skill level.

Beginner Techniques

Start your Sudoku journey with these fundamental strategies that will help you solve easy and medium puzzles:

Naked Singles

The most basic technique. Find cells where only one number can fit based on row, column, and box constraints.

Hidden Singles

Identify numbers that can only appear in one cell within a row, column, or box.

Scanning Technique

Systematically scan rows, columns, and boxes to find obvious placements.

Intermediate Techniques

These strategies are essential for solving medium and hard puzzles:

Naked Pairs

When two cells in a unit contain the same two candidates, eliminate those numbers from other cells.

Hidden Pairs

Find two numbers that can only appear in two cells within a unit, even if those cells have other candidates.

Locked Candidates

Also known as Pointing Pairs. Use box-line interactions to eliminate candidates.

Advanced Techniques

Master these strategies to conquer expert-level puzzles:

X-Wing Pattern

A powerful technique using four cells forming a rectangle to eliminate candidates in rows or columns.

Swordfish Pattern

An extension of X-Wing using three rows and columns to create elimination patterns.

Y-Wing Chain

Use three cells forming a Y-shape to create powerful eliminations through logical chains.

General Solving Tips

Start with scanning: Always begin by finding naked singles and obvious placements
Use pencil marks: Note candidate numbers in cells for complex puzzles
Process systematically: Work through one technique at a time rather than jumping around
Focus on constrained areas: Boxes with many given numbers are easier to solve
Practice daily: Regular solving builds pattern recognition skills

Choosing the Right Technique

Different difficulty levels require different strategies:

Easy puzzles: Naked singles and basic scanning are usually sufficient
Medium puzzles: Add hidden singles and basic pairs to your toolkit
Hard puzzles: Locked candidates and pointing pairs become necessary
Expert puzzles: Master X-Wing, Swordfish, and chain-based techniques

Ready to practice? Play today's puzzle and apply these techniques!