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Please click here to learn more about the cookies we use on our Website. Easy Medium Hard Expert Evil. Auto-Check for Mistakes. Loading game. New Game Continue. Select Game Mode. Easy Medium Hard Expert Restart. Expert level Sudoku Expert Sudoku is a game for experienced Sudoku players with a very high level of difficulty. Then, when you can add no more numbers to the board using the basic techniques, try the more advanced ones.

Do one at a time until you can plot one more number into a cell. Then, start with the basic techniques again, and repeat the process.

You should be able to solve almost any Sudoku puzzle using these techniques. Techniques for removing numbers: Sole Candidate When a specific cell can only contain a single number, that number is a "sole candidate". This happens whenever all other numbers but the candidate number exists in either the current block, column or row. In this example, the red cell can only contain the number 5, as the other eight numbers have all been used in the related block, column and row.

Unique Candidate You know that each block, row and column on a Sudoku board must contain every number between 1 and 9. This example illustrates the number 4 as the unique candidate for the cell marked in red. The example shows that the number 7 can only be inserted in the red cells of the middle row. Thus you can remove 7 as a possible candidate from the rest of the row. In the middle and the middle-left blocks, the number 8 must be placed in one of the red cells.

This means, we can eliminate 8 from the upper and lower rows in the middle-right column. Naked Subset The example shows that row number 1 and row number 5 both have a cell in the same column containing only the candidate numbers 4 and 7. These two numbers appear as candidates in all of the other open cells in that column too, but since they are the only two candidates in rows 1 and 5, these two numbers cannot appear anywhere else in the row, thus you can remove them.

In the example, the two candidate pairs circled in red, are the sole candidates. Since 4 and 7 must be placed in either of these two cells, all of the pairs circled in blue, can remove those numbers as candidates.

In this puzzle, this means 1 becomes sole candidate in the second row; 2 becomes sole candidate in row 6; and thus, 6 is sole candidate for row number 4.

You can also use this technique if you have more than two candidates. For example, let us say the pairs circled in red were instead triple candidates of the numbers 1, 4, 7. This would mean those three numbers would have to be placed in either rows 1, 2 or 5. We could remove these three numbers as candidates in any of the remaining cells in the column.

Hidden subset This is similar to Naked subset, but it affects the cells holding the candidates. In this example, we see that the numbers 5, 6, 7 can only be placed in cells 5 or 6 in the first column marked in a red circle , and that the number 5 can only be inserted in cell number 8 marked in a blue circle. These types of cookies and other storage technologies such as Pixel Tags are used to deliver advertisements on and through the Service and track the performance of these advertisements.

To this end, we may share information about your use of our site with our trusted social media and advertising partners. These cookies may also be used to enable third-parties, including social media and advertising networks to provide measurement services and deliver ads that may be relevant to you based upon your activities or interests.

Please click here to learn more about the cookies we use on our Website. Easy Medium Hard Expert Evil. Auto-Check for Mistakes. Loading game. New Game Continue. Select Game Mode. Easy Medium Hard Expert Restart. Play Free Sudoku Now! About Sudoku The popular Japanese puzzle game Sudoku is based on the logical placement of numbers. Sudoku Tips Sudoku is a fun puzzle game once you get the hang of it.

Work through the remaining empty cells, trying the numbers that have not been used. Tip 2: Break the grid up visually into 3 columns and 3 rows. Now, look for columns or grids that have 2 of the same number. Logically, there must be a 3rd copy of the same number in the only remaining 9-cell section.