Expert Sudoku

What makes expert Sudoku different

Expert boards use the lowest clue target in the daily set. Advanced strategies such as X-Wing or Swordfish can be useful study topics, but they are not guaranteed to appear in every generated board.

The X-Wing is the gateway technique. It requires you to think about the whole grid at once — a 2×2 rectangle of candidates in two rows and two columns that locks a digit into two of the four corners, no matter which two. Once seen, an X-Wing eliminates that digit from the rest of both columns in one stroke.

If you complete an Expert board without hints in under thirty minutes, you have earned the rest of your day. If you cannot, you probably need one more week of Hard practice before returning.

Best for

• Advanced solvers
• Strategy enthusiasts
• Players studying competitive Sudoku
• A slow-burn twenty-to-forty-minute session

Techniques you'll actually use

These are useful techniques to study for expert sudoku boards, but the current difficulty label does not guarantee a specific solving path:

• Pointing Pair — You will use several on every Expert board just to unlock the intermediate stall.
• X-Wing — The signature Expert technique. Recognisable as a 2×2 candidate pattern locking a digit into two of four corner cells.

See the full learn hub for how these techniques stack across difficulties, and the individual pages for annotated examples on real boards.

Three tips that make expert boards click

1. Do not start an X-Wing scan until the candidate grid is fully reduced by all easier techniques. X-Wings hide under Pointing Pair clutter.
2. Colour your pencil-marks. Highlighting a single candidate digit across the whole grid (a 'candidate view') is how Swordfish and X-Wing patterns become visible.
3. Take breaks. Twenty minutes of Expert with a clear head beats forty minutes of tired staring. Sudoku is a working-memory task; fatigue kills your ability to hold candidate states.

Where Expert Sudoku sits in the ladder

Sudoku difficulty is a continuum, not a step-function. If you're stalling on expert boards, the fix is almost never "try harder" — it's to go back one rung and solidify the technique below.

Printable Expert Sudoku pack

Prefer paper? Every difficulty has a free printable booklet in the printable section — useful for travel, waiting rooms or a screen-free evening. Print packs use the same four broad difficulty bands as the online boards.