Medium Sudoku is the most popular difficulty level and the one most people think of as the classic Sudoku experience. These puzzles have enough given digits to get you started, but require genuine logical deduction to complete.
Medium puzzles strike the ideal balance between accessibility and challenge. They are satisfying to solve without being frustrating, and typically take between 10 and 25 minutes on a standard 9×9 grid. This difficulty is recommended for anyone who has completed a few easy puzzles and is ready to develop their technique further.
Every new puzzle on this page loads at medium difficulty automatically. You can switch grid sizes at any time — a medium 6×6 is a quick solve, while a medium 9×9 offers the full experience most players look for. The 16×16 at medium difficulty is a significant undertaking and recommended for experienced solvers only.
Common strategies at medium difficulty include scanning for hidden singles, looking at box-row and box-column intersections, and tracking which digits are still missing from each region. Our How to Play page covers these techniques in detail. All puzzles are free, randomly generated and require no account to play.