Difficulty · Expert
Expert Sudoku — Free Advanced Puzzles
Expert Sudoku is the level where basic notes stop being enough. Every puzzle requires at least one advanced technique — an X-Wing, a Swordfish, or a locked-candidate chain — but stays 100% solvable by pure logic.
22–26 starting clues, one unique solution.
Guaranteed logic-solvable — no guessing.
Snyder notation and Auto-notes available per game.
Ranked separately on the Expert leaderboard.
Techniques you'll need
X-Wing, Swordfish, XY-Wing, and box-line reduction. Our advanced strategies guide walks through each with worked examples.
Frequently asked questions
What's the difference between hard and expert Sudoku?
Expert Sudoku starts with fewer clues (22–26) and often needs at least one advanced technique — X-Wing, Swordfish, or a chain — where hard puzzles usually don't.
How long should an expert Sudoku take?
20–40 minutes is normal. Sub-15 minutes is elite-level.