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. Now focus on one of these bands at a time and look for those numbers that appear in 2 separate boxes. To begin with, I recommend that you divide the diagram into 3 large vertical bands of 3 squares each. In fact, this technique can even work on completely empty squares, provided certain conditions are met. It may seem easier to focus on the boxes with the fewest empty squares, but this is not always the case. The technique you will most often use is to look for the only possible box for a given symbol within a 3×3 box. In this example, the number 5 is located in boxes I and IV, so it must be entered in the only free cell in the third column in the seventh box. 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. In the first case they will probably be the only techniques you will need to complete the pattern. These techniques will always come in handy when solving any sudoku, from the easiest to the most difficult. Play Sudoku Repubblica online: basic techniques 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. The more clues, the easier the puzzle, but this is not always the case the difficulty of Sudoku depends on many other factors. 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.Įach diagram has cells already filled with a number (usually between 20 and 30 cells, but never less than 17) which are called ‘clues’.
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