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2.5                                                        SUPER SUDOKU









                  Sudoku is a game of numbers.

                  Let’s try to understand this game and play it. Every square has to contain a
                  single number.



                     3       4       1       2           a.   Only the numbers from 1 to 4 can be used.
                                                         b.   Each 2×2 box can only contain each number

                     1       2       4       3                from 1 to 4 once.

                                                         c.   Each vertical column can only contain each
                     4       3       2       1                number from 1 to 4 once.

                                                         d.   Each horizontal row can only contain each
                     2       1       3       4                number from 1 to 4 once.


                           2 × 2 Sudoku


                  Let’s solve a 2 x 2 sudoku.


                             4       2       1



                     1       2       3                    Step  1   Start by looking at first mini grid. As we
                                                                     can see that ‘3’  is  missing,  hence  we

                                             2                       write it here.



                             1

                                                                                        3       4        2       1



                                                                                        1       2        3       4
                    Step  2   The second row in the mini grid has the
                                number ‘4’  missing.
                                                                                                                 2



                                                                                                1




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