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Sudoku for Beginners
Begin with Easy puzzles and scan one digit at a time. Confidence comes from recognising why a digit must fit—not from solving quickly.
Find naked singles
When an empty cell has only one legal candidate, place that value.
Find hidden singles
A digit may be possible in several cells generally but only one cell within a particular row, column or box.
Use mistakes as feedback
If a move conflicts with the grid, undo it and inspect the three affected houses.