How to Solve a Sudoku Puzzle: A Family Guide for Beginners

Learn the basic rules and strategies to solve sudoku puzzles with your family, from simple techniques to more advanced methods.

  1. Understanding the Basic Rules. A sudoku puzzle is a 9x9 grid divided into nine 3x3 boxes. The goal is to fill every empty square with numbers 1 through 9. Each row, column, and 3x3 box must contain all numbers from 1 to 9 exactly once. Start by looking at the numbers already given in the puzzle—these are your clues. You'll use logic to figure out where the missing numbers belong, never guessing randomly.
  2. Start with the Easy Wins. Look for rows, columns, or 3x3 boxes that are almost complete—missing only one or two numbers. These give you the quickest victories and help build momentum. When you find a row missing just one number, you can immediately fill it in. Next, scan for squares where only one number can possibly fit. Check what numbers are already in that square's row, column, and 3x3 box, then see what's left.
  3. Use the Process of Elimination. For each empty square, write small pencil marks of all possible numbers that could go there. Cross out numbers that already appear in the same row, column, or 3x3 box. As you fill in more squares, keep updating these pencil marks. When a square has only one possible number left, fill it in with confidence. This systematic approach prevents mistakes and helps you see patterns.
  4. Try the Scanning Technique. Pick one number, like 5, and scan the entire puzzle looking for where it can go. Start with the 3x3 boxes that already have several 5s nearby—this limits your options. Look at each empty square in that box and ask: 'Can a 5 go here?' Check if 5 already appears in the same row or column. Work through all nine 3x3 boxes this way, then repeat with different numbers.
  5. Work Through Stuck Moments. When you feel stuck, take a break and come back with fresh eyes. Double-check your work by making sure no number appears twice in any row, column, or box. Look for hidden singles—squares where only one number can fit, even though it might not be obvious at first. Sometimes filling in more pencil marks reveals new possibilities you missed before.