Online Sudoku

Medium (Intermediate) Classic Sudoku - Free Online Sudoku Puzzles

Play free medium (intermediate) classic sudoku online. Perfect for brain training and logic puzzle enthusiasts.

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Controls

What is medium Sudoku?

Sudoku is a logic-based number puzzle game that has captivated millions worldwide. This popular web sudoku game challenges players to fill a 9×9 grid with digits 1-9, ensuring each number appears exactly once in every row, column, and 3×3 subgrid.

Our free sudoku online platform offers the perfect digital experience for puzzle enthusiasts of all skill levels. Whether you're a beginner learning the basics or an expert seeking the ultimate challenge, our web-based sudoku puzzles provide hours of engaging mental exercise.

medium difficulty sudoku puzzles are specifically designed for players who have mastered the basics and are ready for intermediate challenges.

How to Play medium Sudoku

Basic Rules

  • •Fill the entire 9×9 grid with numbers 1 through 9
  • •Each row must contain all numbers 1-9 without repetition
  • •Each column must contain all numbers 1-9 without repetition
  • •Each 3×3 subgrid must contain all numbers 1-9 without repetition

Web Sudoku Controls

  • •Click any cell to select it
  • •Use keyboard numbers 1-9 to fill cells
  • •Press 'D' to toggle draft mode for notes
  • •Use Delete/Backspace to clear cells
  • •Click the Hint button for assistance (3 hints per puzzle)

Medium Sudoku Solving Techniques

Medium Sudoku puzzles typically have 30-35 given numbers, requiring combination of basic and intermediate techniques. These puzzles introduce the concept of candidate elimination through pattern recognition. Start with naked and hidden singles, then systematically look for pairs and intersection patterns. Maintain organized pencil marks to track complex eliminations effectively.

Key Techniques for Medium Sudoku:

  • ✓Naked Pairs: Identify two cells in the same unit (row, column, or box) that contain exactly the same two candidate numbers, then eliminate these numbers from other cells in that unit.
  • ✓Hidden Pairs: Find two numbers that can only appear in exactly two cells within a unit, then eliminate all other candidates from those cells.
  • ✓Naked Triples: Locate three cells in a unit where the candidates are distributed among exactly three numbers, allowing elimination of these numbers elsewhere in the unit.
  • ✓Pointing Pairs/Triples: When candidates for a number in a box are confined to a single row or column, eliminate that number from the same row/column outside the box.
  • ✓Box/Line Reduction: If a candidate appears in only one row or column within a box, eliminate it from that row/column in other boxes.
  • ✓Intersection Removal: Use the overlap between boxes and rows/columns to eliminate candidates through logical deduction.
  • ✓Candidate Lines: When all candidates for a number in a unit lie on a single line, use this constraint to eliminate possibilities in intersecting units.

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