Notes in Sudoku.

If you get stuck on Sudoku grid and don't see the obvious solutions for the rest of cells, you should use Notes. With the help of Notes you should fill in all the possible options for each blank cell, focusing on the numbers that are already on the Sudoku grid.

It is very important to fill in Notes correctly. Since if you make a mistake, it will be much more difficult and longer to solve Sudoku.

When you place the Notes, it will be easier for you to understand where and what number should be placed. Also, many advanced Sudoku solving techniques are based on the use of Notes. You can learn about such techniques from the lessons on our Sudoku.com website.