Expert sudoku
Expert sudoku asks you to see patterns across the whole board: X-Wings, skyscrapers and XY-Wings, on top of everything Hard needs.
A thousand Expert puzzles, free in your browser. No sign-up, nothing to download.
What it takes
How often each technique is needed in the game’s Expert puzzles, counted over 300 of them:
- Hidden singlesin 100% of them
- Locked candidatesin 97% of them
- Skyscraper and 2-String Kitein 80% of them
- Pairsin 78% of them
- Naked singlesin 78% of them
- XY-Wingin 60% of them
- X-Wingin 31% of them
- Triplesin 15% of them
Expert puzzles start with 24 to 28 digits given, 26 on average. Every one has exactly one solution, and none needs a guess.
Tips
- Look at one digit at a time across the whole board: fish and skyscrapers are about a single digit.
- Cells with two notes are what wings are made of: look at the ones that see each other.
- Stuck? A hint names the technique the next step needs, and shows the step.
Other levels
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