Step 1: Understand the Sudoku Grid
A standard Sudoku puzzle consists of a 9×9 grid. It is divided into nine 3×3 subgrids or “regions.”
Step 2: Rules of Sudoku
Each row must contain all the numbers from 1 to 9, with no repetition.
Each column must also contain all the numbers from 1 to 9, with no repetition.
Each 3×3 subgrid must contain all the numbers from 1 to 9, with no repetition.
Step 3: Start with What’s Given
Start by looking at the numbers already provided in the puzzle. These are your starting points.
Step 4: Use the Process of Removal
Examine each row, column, and 3×3 subgrid carefully. Find numbers that can be filled in based on the given clues.
Cross out or remove numbers in rows, columns, and sub grids where they can’t fit according to the rules.
Step 5: Look for Single Candidates
In each row, column, and subgrid, find cells with only one possible number. Fill in that number.
Step 6: Apply Strategies
As you progress, use strategies like “naked pairs” or “hidden singles.” These strategies help you find and place numbers more efficiently.
Naked Pairs: If two cells in a row, column, or subgrid can only contain the same two numbers, you have an opportunity. You can remove those numbers from other cells in the same row. You can apply this to the column or subgrid as well.
Hidden Singles: A cell can be the only place in a row, column, or subgrid for a specific number. Find these opportunities and place the number.
Step 7: Repeat and Iterate
Continue steps 4 through 6. Fill in numbers and use elimination and logic. Repeat these steps until you have filled in all the cells in the grid.
Step 8: Double-Check
Once you’ve filled in all the cells, check your work again. Make sure you haven’t made any mistakes.
Step 9: Congratulations!
If you’ve successfully filled in all the numbers without breaking the Sudoku rules, you’ve solved the puzzle.
Sudoku puzzles range in difficulty. It’s a good idea to start with easy puzzles. Gradually work your way up to more challenging ones as you become more comfortable with the techniques involved. Practice and patience are key to improving your Sudoku-solving skills.