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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.
Start with the fullest units
Look first at rows, columns or 3×3 boxes that already contain many digits. Fewer missing values means fewer possibilities to compare.
Find naked singles
When an empty cell has only one legal candidate after checking its row, column and box, 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. That unique position is forced.
Use candidate notes carefully
Write a candidate only when it is allowed by all three units. Update notes immediately after every confirmed placement so old possibilities do not create false patterns.
Use mistakes as feedback
If a move conflicts with the grid, undo it and inspect the three affected units. Identify which rule was missed before continuing.
Move up gradually
Stay on Easy until singles feel natural, then try Medium puzzles to practise pairs and locked candidates without abandoning the same systematic routine.