- Begin by scanning each row for missing digits, then do the same for columns and boxes.
- A 3x3 box with many clues is the easiest place to find forced placements.
- Mark candidates in cells where two or three numbers are possible.
- Eliminate candidates when a digit is already present in the same row, column, or box.
- Look for pairs of cells in a row that share the same two candidates.
- Classic puzzles should never require guessing if constructed correctly.
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Sudoku Classic Tips
Strategies to play smarter and score higher
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Difficultymedium
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