Evil Sudoku
Evil Sudoku sits near the minimum clue count a unique puzzle can have. Every one of these is still solvable by logic — but you will need the advanced techniques, and you should expect a long sitting.
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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