Medium sudoku is the most popular difficulty level and for good reason — it strikes the perfect balance between accessibility and challenge. Each medium puzzle provides 30 to 35 given numbers, fewer than easy but enough to keep the puzzle approachable. To solve medium puzzles, you will need to go beyond Naked Singles and use Hidden Singles: situations where a number can only go in one cell within a row, column, or box, even though that cell might appear to have multiple candidates at first glance.
This difficulty level is perfect for players who have mastered easy sudoku and want a more engaging experience. Medium puzzles typically take 10 to 20 minutes to complete and require more careful scanning of the grid. You will often need to use pencil marks (notes mode) to track candidate numbers in cells where multiple options exist. The satisfaction of working through a medium puzzle and finding that key Hidden Single is what keeps millions of players coming back every day.
If you find medium puzzles becoming routine, it is time to move up to hard sudoku where you will encounter new techniques like Naked Pairs. If you are struggling, drop back to easy sudoku to reinforce your fundamentals, or check out our strategy guide for detailed tips on mastering Hidden Singles and cross-hatching techniques that will sharpen your solving skills.