Expert sudoku

What to expect at this level

Every expert sudoku here has been checked to need at least one fish pattern: the board will not finish without an X-Wing or a Swordfish. Nothing goes beyond that, so a complete set of pencil marks and patience will get you there.

Techniques you'll use

• X-Wing
• Swordfish

Use New puzzle for another at this level. Need a breather? Enjoy an easy sudoku. Go there.