- Difficulty
- Medium
- Time
- 00:00
- Checks
- 0
Select a square and place a number.
medium Sudoku
Turn careful scanning into a steady rhythm.
Medium Sudoku uses the same three rules as every standard grid: each row, column, and 3 × 3 box must contain 1 through 9 exactly once. The difference is the length and depth of the logical path, not a change in the rules.
The puzzle shown here is designed for about 10 minutes. Its verified solution takes 51 supported steps and uses Naked Single. It has exactly one solution, so no branch or random guess is required.
Alternate between cell scanning and digit scanning. Candidate notes make quieter hidden singles visible when the obvious placements run out.
Use Notes to keep candidates visible, Check when you want to audit the current grid, and Hint for the next logical idea rather than a filled answer. Progress is stored on this device, so a longer solve can be paused and resumed without an account.
Common questions
What makes this Sudoku medium?
The rating reflects the verified solving path: 51 steps using Naked Single. Difficulty is based on deductions, not on guesswork or simply counting the givens.
How should I approach a medium Sudoku?
Alternate between cell scanning and digit scanning. Candidate notes make quieter hidden singles visible when the obvious placements run out.
What should I do when I get stuck?
Choose one missing digit and trace it across every box. A constrained location is easier to see when you ask one precise question at a time.
Can I pause and continue later?
Yes. Your entries, notes, elapsed time, and completion state are saved locally in this browser and restored when you return.