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Sudoku in a nutshell
Fill the grid so every row, column, and 3×3 box holds the digits 1–9 with no repeats. There's always a logical next step — no guessing.
Start where the grid is fullest and place the digits that are forced. When you're stuck, pencil in candidates and hunt for pairs and patterns.
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Answer applied. We've filled in the next logical square. Keep going!
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