What makes Expert Sudoku hard?
An Expert puzzle starts with just 22 givens — one step below Evil, and it feels like it. The beginner tools will place a few numbers and then dry up almost entirely. Where Hard puzzles bend to a naked pair or a pointing pair, Expert grids often need a genuine advanced pattern before anything moves at all.
What separates Expert from Evil is mostly how often you need the hard stuff. On Expert, a well-placed X-Wing usually breaks the grid open and the rest falls into place. On Evil, you might need several of those breakthroughs in a row. Expert is the level where the advanced techniques stop being optional and start being the whole game.
The techniques it demands
You'll lean on the advanced patterns here — the ones that eliminate candidates across the whole board rather than one unit at a time:
- X-Wing Sudoku Technique Explained — One digit confined to the same two columns across two rows (or vice versa) — eliminate it from the rest of those lines.
- Forcing Chains — Follow both values of a bi-value cell; if both branches force the same digit somewhere, that conclusion is certain.
The X-Wing is your bread and butter at this level, and forcing chains are the fallback for the rare grid that resists everything else. If those names are new, the Sudoku School builds up to them one technique at a time.
How to break a stuck Expert grid
- Full pencil marks, no exceptions. You cannot spot an X-Wing by eye — every candidate has to be on the board first.
- Hunt one digit across the whole grid. The advanced single-digit patterns only appear when you track a number everywhere it could go, not box by box.
- Trust the logic. There is always a deduction. If you're tempted to guess, there's a pattern you haven't found yet.
Think you've got Expert handled? Evil Sudoku is the final step up — 18 givens and no easy moves at all.