Scanning means checking rows, columns, and boxes with many filled cells before looking at harder areas.
Guide
Sudoku Tips for Beginners
Sudoku is solved with logic, not guessing. Start by scanning the easiest rows, columns, and 3x3 boxes, then write small candidate notes when a cell has more than one possible answer.
Three habits that help
- Look for rows, columns, or boxes that already have five or more digits.
- Check whether a missing digit has only one possible position in a 3x3 box.
- Use notes sparingly and clean them up when a number is placed nearby.
Common beginner mistake
A number can look correct in a row but still break a column or 3x3 box. Always check all three areas before committing a digit.
Next techniques to learn
A naked single appears when a cell has only one legal candidate left after row, column, and box checks.
A hidden single is the only place a digit can go inside a row, column, or box even when the cell has other candidates.
Locked candidates let you remove notes when a digit is confined to one row or column inside a 3x3 box.
Frequently asked questions
What should a beginner look for first in Sudoku?
Start with rows, columns, and boxes that already have many filled digits. Fewer empty cells usually means fewer possible moves to compare.
When should I use candidate notes?
Use notes when a cell has two or three realistic options or when the puzzle stops moving. Keep notes updated after every placement.
Is guessing a good Sudoku tip?
No. Guessing can hide mistakes. A better habit is scanning again, checking notes, and looking for singles.