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Medium Sudoku — Build Your Solving Skills
Medium Sudoku puzzles bridge the gap between beginner and advanced play. You'll use familiar techniques like Naked Singles, plus intermediate strategies such as Naked Pairs, Pointing Pairs, and Box-Line Reduction to eliminate candidates and find solutions.
What Makes Medium Sudoku Different?
Medium puzzles present a meaningful step up from easy difficulty. With only 30 to 35 starting clues, you will encounter cells that cannot be solved by simply scanning for obvious singles. Instead, you need to build a complete picture of candidate numbers across rows, columns, and boxes, then use elimination techniques to narrow down possibilities.
The key difference is that medium puzzles require you to think about relationships between cells. A Naked Pair in one row might eliminate candidates in another cell, which then reveals a Hidden Single elsewhere. This chain of logical deductions is what makes medium puzzles more rewarding to solve. If you can handle these interconnected reasoning steps, you are developing the skills needed for hard Sudoku.
Tips for Medium Sudoku
These intermediate strategies will help you conquer medium-level puzzles. Each technique is explained in detail in our technique library.
- Always fill in pencil marks first — Before attempting any eliminations, note all possible candidates in every empty cell. This gives you the full picture needed for intermediate techniques.
- Spot Naked Pairs — When two cells in the same row, column, or box share exactly two candidates, those numbers are locked to those cells. Eliminate them from other cells in that unit. See the Naked Pair guide.
- Check for Pointing Pairs — When a candidate number within a box is restricted to a single row or column, it can be eliminated from that row or column outside the box. Learn the Pointing Pair technique.
- Use Box-Line Reduction — The reverse of Pointing Pairs: when a candidate in a row or column is confined to a single box, eliminate it from other cells in that box. See Box-Line Reduction.
- Use the hint feature to discover new techniques when you're stuck — it explains each step so you learn as you play.
Frequently Asked Questions
What techniques do I need for medium Sudoku?
Medium puzzles require Naked Singles and Hidden Singles, plus basic elimination techniques like Naked Pairs and Pointing Pairs. You may occasionally need to scan for candidates more carefully than in easy puzzles.
How many clues does a medium Sudoku have?
Medium Sudoku puzzles typically have 30-35 given digits. Fewer starting clues means more cells to solve, requiring stronger logical reasoning and sometimes intermediate techniques.
How can I improve at medium Sudoku?
Practice using pencil marks consistently, learn to spot Naked Pairs and Pointing Pairs, and work on scanning speed. Our hint system explains each step so you can learn as you play.
What is the difference between easy and medium Sudoku?
Easy puzzles can be solved with just Naked Singles and Hidden Singles, while medium puzzles introduce elimination techniques like Naked Pairs, Pointing Pairs, and Box-Line Reduction. Medium puzzles also have fewer starting clues (30-35 vs 36-45), which means more cells require multi-step logical reasoning.
What are pencil marks and why are they important?
Pencil marks (also called candidates or notes) are small numbers written in empty cells to track which values are still possible. In medium Sudoku, pencil marks are essential because techniques like Naked Pairs and Pointing Pairs work by analyzing and eliminating candidates across multiple cells.
How long does it take to solve a medium Sudoku?
Most intermediate players solve medium puzzles in 8 to 15 minutes. Beginners transitioning from easy puzzles may take 15 to 30 minutes initially. Speed improves as you learn to recognize common patterns like Naked Pairs and Pointing Pairs without having to think through each one.
What is a Naked Pair in Sudoku?
A Naked Pair occurs when two cells in the same row, column, or box contain exactly the same two candidates. Since those two numbers must go in those two cells, you can eliminate them as candidates from all other cells in that unit. This is one of the most common intermediate techniques.
When should I move from easy to medium Sudoku?
You are ready for medium puzzles when you can consistently solve easy puzzles in under 10 minutes without using hints. If you find easy puzzles too predictable and want a greater logical challenge, medium difficulty is the natural next step.