Expert Sudoku
Expert puzzles are the ones where the obvious move is a trap. They often require an XY-Wing or a short forcing chain, and the difference between a good and a bad session is how quickly you can rebuild your candidate grid after a wrong turn.
What to expect
- 240 puzzles in this level
- 28 clues on average
- Techniques: XY-Wing, Forcing chains, Uniqueness
- Average technique score: 51
Techniques in play
Frequently asked
What makes a sudoku "expert"?
In this rating, expert puzzles need XY-Wing, Forcing chains, Uniqueness 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 expert puzzle take?
Most players finish in 20–45 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.