Hard Sudoku
Hard Sudoku gives you fewer starting digits and stops rewarding pure scanning. Expect to keep full pencil marks and to lean on hidden pairs and pointing pairs to break the grid open.
Strategy1 min read
X-Wing and Swordfish, explained without the jargon
Two pattern-based Sudoku techniques that unstick expert grids — what they are, how to spot them, and when they are worth the effort.
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