Play Medium Sudoku Online - Free
Medium Sudoku is the most played difficulty for a reason: singles alone no longer finish the grid, so you start using pencil marks, naked pairs and pointing candidates. Each puzzle asks you to slow down two or three times and reason about what a unit still needs. If Easy has become routine and Hard still feels like a wall, this is the level where your technique vocabulary actually grows.
Techniques you'll need
- Naked PairWhen two cells in a unit share the same two candidates.
- PointingA box confines a candidate to one row or column.
- Hidden PairWhen two numbers can only fit in the same two cells.