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Classic Sudoku
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Classic Sudoku
Medium Sudoku - Free Online Medium Sudoku Puzzles
Medium-level Classic Sudoku requires systematic logical reasoning. You'll encounter 30–35 given numbers, and solving demands techniques like Hidden Singles, Block Elimination, and candidate management. Pencil marks become essential here — tracking candidates for each cell helps you spot patterns and eliminate impossibilities step by step.
Medium
Average Time
10–20 minutes
Recommended Hints
1–2
Given Numbers
30–35
What is Medium Sudoku?
Medium Sudoku is a classic 9×9 number puzzle where each row, column, and 3×3 box must contain digits 1 through 9 exactly once. Medium puzzles strike the perfect balance between challenge and enjoyment, making them ideal for sharpening your logical thinking and pattern recognition skills.
You can play free Medium Sudoku puzzles online right here — no downloads, no sign-up required. Just open the page and start solving. All our puzzles are generated with a single, logical solution path, so you never need to guess.
Whether you're practicing daily or just want a quick brain workout, Medium Sudoku offers a clean, distraction-free interface that works great on both desktop and mobile devices.
Medium Sudoku Rules & How to Play
The rules of Medium Sudoku are the same as all classic Sudoku puzzles: fill every row, column, and 3×3 box with numbers 1 through 9, with no repeats. The difference is in the number of pre-filled clues and the complexity of deductions required.
If you're new to Sudoku or want to brush up on advanced solving techniques, check out our detailed How to Play Sudoku guide. It covers everything from the basic rules to advanced strategies step by step.
Learn How to Play Sudoku →Medium Sudoku Strategies & Key Techniques
Solving Medium Sudoku efficiently requires the right set of techniques. Below are the key strategies most commonly used at this difficulty level. Mastering these will help you solve faster and with more confidence.
1
Block Elimination
If a number can only appear in one row or column within a 3×3 box, remove it as a candidate from the rest of that row/column outside the box.
2
Candidate Discipline
Always keep pencil marks updated. When you place a number, remove it from candidates in the same row, column, and box immediately.
3
Naked Pair
When two cells in the same unit share exactly the same two candidates, those two numbers can be eliminated from all other cells in that unit.
For a complete library of solving techniques — from basic elimination to advanced X-Wing and Swordfish patterns — visit our Sudoku Strategies & Tips page.
Explore All Sudoku Strategies →Medium vs Other Difficulty Levels
Not sure which difficulty is right for you? Here's how Medium compares to other levels. You can always switch difficulty anytime — your game progress is saved automatically.
Frequently Asked Questions about Medium Sudoku
What skills do I need for Medium difficulty?
Medium puzzles assume you're comfortable with Naked Singles, Hidden Singles, and basic elimination. You should be familiar with keeping pencil marks organized, as candidate management becomes critical. Block elimination techniques start playing a major role.
How long does a Medium puzzle typically take?
Most solvers take 10–20 minutes for Medium puzzles. Skilled players finish in 7–12 minutes. The wider range reflects how much your technique arsenal matters — knowing Naked Pairs and Pointing Pairs can cut your time significantly.
I'm stuck on a Medium puzzle. What should I do?
First, update all pencil marks — you may have missed removing some candidates. Then look for Hidden Singles (a number that can only appear in one cell within a row, column, or box). If still stuck, check for Naked Pairs or Pointing Pairs. Use the Hint button as a last resort — it explains the reasoning, which helps you learn.
When am I ready for Hard difficulty?
You're ready when you can solve Medium puzzles in under 15 minutes and understand why each deduction works (not just guessing). Make sure you've mastered Hidden Pairs and Pointing Pairs, as Hard puzzles frequently require these.
