Scanning

Sudoku Scanning Strategy

Scanning is the first Sudoku strategy most players should learn. It means checking rows, columns, and boxes before placing a number.

Scanning profile

Search intent
Learn the simplest Sudoku strategy.
Senior fit
Scanning is calm, visual, and works well on large print boards.
Best use
Very Easy and Easy puzzles, then Medium after the habit feels natural.
Why it matters
It reduces random clicking and helps older players move more slowly.

Slow scanning works

Large print play rewards careful scanning. Start with a number that appears often, then check where it can still fit.

This strategy is especially useful on Very Easy and Easy puzzles.

A simple scanning routine

Pick one number. Look across the board for rows, columns, and boxes where that number already appears. Then check the gaps.

Repeat the same method instead of jumping between many different techniques at once.

Scanning Paths

Beginner strategy

Keep the approach even simpler for a first visit.

Beginner

Pencil marks

Add candidate notes only after scanning stops being enough.

Pencil Marks

Easy puzzle

Practice scanning on a calm large print board.

Play Easy

Read rules

Review the three basic Sudoku checks first.

Rules

Practical Questions

Is scanning enough for beginners?

Often yes, especially on Very Easy and Easy puzzles.

Should I scan one row at a time?

Yes. One row, one column, or one box at a time is easier to follow.