Medium Sudoku
Medium puzzles keep singles in the mix but stop being solvable by scanning alone. This is where pencil marks start to pay for themselves: a pair of cells that can only hold the same two digits eliminates those digits from the rest of the unit.
What to expect
- 240 puzzles in this level
- 27 clues on average
- Techniques: Locked Candidates, Naked Pair, Hidden Pair, Naked Triple
- Average technique score: 102
Techniques in play
Frequently asked
What makes a sudoku "medium"?
In this rating, medium puzzles need Locked Candidates, Naked Pair, Hidden Pair and nothing harder. The label comes from the techniques a human solver is forced to use, not from the number of clues alone.
How long does a medium puzzle take?
Most players finish in 6–12 minutes. The timer pauses when you press Pause, and your progress is saved if you close the tab.
Do I need an account?
No. There is no sign-up, no email, and nothing leaves your browser. Progress is stored in localStorage on this device.
Are hints free?
Yes, all of them. A hint tells you which technique applies and why it works, then offers to place the digit — it does not just fill the cell.