How to play Sudoku puzzles

You can play on Sudokusonline.com more than a billion free online Sudoku puzzles.

The goal of Sudoku puzzle is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 sub-grids that compose the grid, contains all of the digits from 1 to 9. The same digit may not appear twice in the same row or column or 3x3 subregion.

Click on a cell to select or deselect a number from 1 to 9. You can also click on both sides of a cell to select up to 6 candidates, 3 on each side.

If you solve a Sudoku puzzle you will obtain a classification for your time compared to other users results of the same level.

To save and see your best times, the number of solved Sudoku puzzles and other interesting statistics, you have to log in with your Facebook account.

Attention! If you use the help options or pause the game, you won't obtain a classification for your time and it won't be included on the global classifications.