# Sudoku repubblica, unlimited free sudoku online

## How to play free sudoku on Sudoku Repubblica

If this is your first time visiting Sudoku Repubblica, choose the difficulty you prefer to start a new game, only free sudoku puzzles!

Click or tap on an empty box to select it and enter a number using the bar below the sudoku puzzle, or with the keyboard.

You can interrupt the game and leave the page at any time; when you return to the Sudoku Repubblica site, you can pick up the game where you left off!

On Sudoku Repubblica you will find new free sudoku puzzles every day for all difficulties.

### An easy Sudoku for beginners

The rules of Sudoku are very simple: You have to fill in all cells of a 9×9 table, so that each row, each column and each 3×3 block contains all numbers from 1 to 9.

Each diagram has cells already filled with a number (usually between 20 and 30 cells, but never less than 17) which are called ‘clues’. The more clues, the easier the puzzle, but this is not always the case; the difficulty of Sudoku depends on many other factors.

If you are new to sudoku, I recommend that you start with an easy puzzle (you can also go to the easy sudoku page) and, after some practice, try a medium-difficulty sudoku.

### Play free sudoku online: basic techniques

These techniques will always come in handy when solving any sudoku, from the easiest to the most difficult. In the first case they will probably be the only techniques you will need to complete the pattern. They are based on the ‘glance’ and the application of the basic rules of sudoku: each symbol from 1 to 9 must appear only once in each row, column and 3×3 box.

The technique you will most often use is to look for the only possible box for a given symbol within a 3×3 box. It may seem easier to focus on the boxes with the fewest empty squares, but this is not always the case. In fact, this technique can even work on completely empty squares, provided certain conditions are met.

To begin with, I recommend that you divide the diagram into 3 large vertical bands of 3 squares each. Now focus on one of these bands at a time and look for those numbers that appear in 2 separate boxes.

Once you have found a number that meets this condition, this number must necessarily be in the third frame and in a different column from the other 2. If this column already has 2 occupied cells, we have reached our goal and can enter the number. If, on the other hand, it only had one occupied cell, we would have 2 possible solutions and would therefore have to “peek” along the relevant rows in search of our number. If one of the 2 rows has the number, we can then insert it into the cell on the other row, otherwise we will have to try again with another number.

The same applies if we divide the diagram into 3 horizontal bands and proceed by rows.

Try putting this technique into practice immediately with a free sudoku above.