Using Pencil Marks

Pencil Marks

If you want to pick up your Sudoku game to the next level you need to get familiar with pencil marks.

As discussed before, it is helpful and sometimes even necessary to keep track of the possible values for a cell.

We sometimes do it for more than one cell and we keep the candidates written within the cell itself. These are called Pencil Marks.

Let's fill in the pencil marks for R5C5. To begin with, it can be any digit between '1' and '9'.
Using Pencil Marks

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