How to Play Sudoku
If you are starting Sudoku, focus on a repeatable process: scan, eliminate, place, then re-scan. This keeps the board readable and helps you improve quickly without guessing.
Summary
A beginner-friendly process for starting and finishing classic 9x9 Sudoku puzzles.
Table of Contents
What this technique is
A practical solving workflow that helps beginners progress without guessing.
When to use it
Use this process on easy and medium boards, or as a reset loop whenever you feel stuck.
How it works
Rotate through scan, eliminate, place, and re-scan. Add notes when direct placements slow down.
Step-by-step
- Start with the most constrained row, column, or box.
- Place direct values and update nearby candidates.
- Add notes and continue with the same loop until solved.
Example
After placing one digit in a crowded box, immediately re-check overlapping rows and columns for newly created singles.
Step 1: Understand the Grid
Sudoku has 9 rows, 9 columns, and nine 3x3 boxes. Every unit must contain digits 1 to 9 exactly once.
Step 2: Start with Obvious Placements
Find rows and columns with many givens. Fill cells where only one number can fit after checking row, column, and box.
Step 3: Use Elimination
For each empty cell, remove numbers already present in the same row, column, and box. The remaining candidates narrow your next move.
Step 4: Add Notes When Needed
When direct moves run out, write candidate notes to track possibilities and reveal patterns like singles and pairs.
Step 5: Stay Consistent
Avoid random jumps. Work through constrained areas, update notes, and re-check intersections after every confirmed placement.
Common Mistakes
- Skipping notes too long on medium or harder boards.
- Not revisiting a box after placing a new digit nearby.
- Guessing instead of continuing elimination.
FAQ
How do I start solving Sudoku?
Start with rows, columns, or boxes that are close to completion, then place only fully validated digits.
Should I use notes early?
Yes. Notes are useful as soon as obvious moves begin to disappear.
Is Sudoku good for beginners?
Yes. Easy Sudoku is beginner-friendly and helps build logic habits quickly.