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by SADIA ZAREEN
Easy 4 by 4 puzzle
A.   4      3
            1                      4
     3                 4           1
                       2
         For answers click once.
Easy 4 by 4 puzzle
A.   4   3    1   2
     2   1    3   4
     3   2    4   1
     1   4    2   3
Easy 4 by 4 puzzle
B.
            1          4
                       3           1
     1      3
            4          1
         For answers click once.
Easy 4 by 4 puzzle
B.   3   1    4   2
     4   2    3   1
     1   3    2   4
     2   4    1   3
Easy 4 by 4 puzzle
C.
     4                 2           3
            3                      4
     3                 4
            4                      2
         For answers click once.
Easy 4 by 4 puzzle
C.
     4   1    2   3
     2   3    1   4
     3   2    4   1
     1   4    3   2
Easy 4 by 4 puzzle
D.
     3      1          4
            2
                       1           4
            4                      3
         For answers click once.
Easy 4 by 4 puzzle
D.
     3   1    4   2
     4   2    3   1
     2   3    1   4
     1   4    2   3
4 by 4 puzzle
E.
             3          4           2
                        3
             1
     3       2          1
          For answers click once.
4 by 4 puzzle
E.
     1      3    4       2
     2      4    3       1
     4      1    2       3
     3      2    1       4
4 by 4 puzzle
F.
     2                  4           1
     4
                                    4
     1                  2           3
          For answers click once.
4 by 4 puzzle
F.
     2     3    4    1
     4     1    3    2
     3     2    1    4
     1     4    2    3
4 by 4 puzzle
G.
     3       1
     4                              1
     1                              4
                        1           3
          For answers click once.
4 by 4 puzzle
G.
     3     1    4    2
     4     2    3    1
     1     3    2    4
     2     4    1    3
4 by 4 puzzle
H.
     1       4          2
                                    1
     4
     2       3                      4
          For answers click once.
4 by 4 puzzle
H.
     1     4    2    3
     3     2    4    1
     4     1    3    2
     2     3    1    4
Easy 6 by 6 puzzle
I.     2 4
       3 5 2                      6
     4 5                    3
       4                    2     1
     2   1 4                5
           5                6
        For answers click once.
Easy 6 by 6 puzzle
I.   6   2   4 3   1   5
     1   3   5 2   4   6
     4   5   6 1   3   2
     5   4   3 6   2   1
     2   6   1 4   5   3
     3   1   2 5   6   4
Easy 6 by 6 puzzle
J.   3 2                    5     6
       4
     1   6           3            4
     2   4           5            1
                            3
     5 1                    4 2
        For answers click once.
Easy 6 by 6 puzzle
J.   3   2   1 4   5 6
     6   4   5 2   1 3
     1   5   6 3   2 4
     2   3   4 5   6 1
     4   6   2 1   3 5
     5   1   3 6   4 2
6 by 6 puzzle
K.             5       2 1 3
     1         6       3 4 2


     4   1 3           5            6
     5   2 4           6
          For answers click once.
6 by 6 puzzle
K.   6   4   5 2   1     3
     1   5   6 3   4     2
     2   3   1 4   6     5
     3   6   2 1   5     4
     4   1   3 5   2     6
     5   2   4 6   3     1
Hard 6 by 6 puzzle
L.       5 6
         6            3            5
     3
                                   3
     2        5         4
                      1 5
         For answers click once.
Hard 6 by 6 puzzle
L.   1   5   6   2   3   4
     4   6   1   3   2   5
     3   2   4   5   1   6
     5   1   2   4   6   3
     2   3   5   6   4   1
     6   4   3   1   5   2
Hard 6 by 6 puzzle
M.            5       1 2
     6        2
                             4
         6
             5                     2
         3 1 2
         For answers click once.
Hard 6 by 6 puzzle
M.   3   4   5   1   2   6
     6   5   2   4   1   3
     1   2   3   6   4   5
     2   6   4   3   5   1
     4   1   6   5   3   2
     5   3   1   2   6   4
9                6 2                   7
   N.
                4                    3                 8 6
              8 1 9                           2
            1 5 8 3 4                    9
  puzzle




              7                              9
                9   8                    6 5 1 3
9 by 9




                5   9                    7 3 2
            9 6   4                        8
            4     2 1                        5
     For a hint click once; for answers click twice.
5   9   3   8   6   2   1   4   7
   N.
           7   2   4   1   5   3   9   8   6
           6   8   1   9   7   4   2   3   5
           1   5   8   3   4   9   7   6   2
  puzzle




           3   7   6   5   2   1   4   9   8
           2   4   9   7   8   6   5   1   3
9 by 9




           8   1   5   6   9   7   3   2   4
           9   6   2   4   3   5   8   7   1
           4   3   7   2   1   8   6   5   9

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Sudoku

  • 2. Easy 4 by 4 puzzle A. 4 3 1 4 3 4 1 2 For answers click once.
  • 3. Easy 4 by 4 puzzle A. 4 3 1 2 2 1 3 4 3 2 4 1 1 4 2 3
  • 4. Easy 4 by 4 puzzle B. 1 4 3 1 1 3 4 1 For answers click once.
  • 5. Easy 4 by 4 puzzle B. 3 1 4 2 4 2 3 1 1 3 2 4 2 4 1 3
  • 6. Easy 4 by 4 puzzle C. 4 2 3 3 4 3 4 4 2 For answers click once.
  • 7. Easy 4 by 4 puzzle C. 4 1 2 3 2 3 1 4 3 2 4 1 1 4 3 2
  • 8. Easy 4 by 4 puzzle D. 3 1 4 2 1 4 4 3 For answers click once.
  • 9. Easy 4 by 4 puzzle D. 3 1 4 2 4 2 3 1 2 3 1 4 1 4 2 3
  • 10. 4 by 4 puzzle E. 3 4 2 3 1 3 2 1 For answers click once.
  • 11. 4 by 4 puzzle E. 1 3 4 2 2 4 3 1 4 1 2 3 3 2 1 4
  • 12. 4 by 4 puzzle F. 2 4 1 4 4 1 2 3 For answers click once.
  • 13. 4 by 4 puzzle F. 2 3 4 1 4 1 3 2 3 2 1 4 1 4 2 3
  • 14. 4 by 4 puzzle G. 3 1 4 1 1 4 1 3 For answers click once.
  • 15. 4 by 4 puzzle G. 3 1 4 2 4 2 3 1 1 3 2 4 2 4 1 3
  • 16. 4 by 4 puzzle H. 1 4 2 1 4 2 3 4 For answers click once.
  • 17. 4 by 4 puzzle H. 1 4 2 3 3 2 4 1 4 1 3 2 2 3 1 4
  • 18. Easy 6 by 6 puzzle I. 2 4 3 5 2 6 4 5 3 4 2 1 2 1 4 5 5 6 For answers click once.
  • 19. Easy 6 by 6 puzzle I. 6 2 4 3 1 5 1 3 5 2 4 6 4 5 6 1 3 2 5 4 3 6 2 1 2 6 1 4 5 3 3 1 2 5 6 4
  • 20. Easy 6 by 6 puzzle J. 3 2 5 6 4 1 6 3 4 2 4 5 1 3 5 1 4 2 For answers click once.
  • 21. Easy 6 by 6 puzzle J. 3 2 1 4 5 6 6 4 5 2 1 3 1 5 6 3 2 4 2 3 4 5 6 1 4 6 2 1 3 5 5 1 3 6 4 2
  • 22. 6 by 6 puzzle K. 5 2 1 3 1 6 3 4 2 4 1 3 5 6 5 2 4 6 For answers click once.
  • 23. 6 by 6 puzzle K. 6 4 5 2 1 3 1 5 6 3 4 2 2 3 1 4 6 5 3 6 2 1 5 4 4 1 3 5 2 6 5 2 4 6 3 1
  • 24. Hard 6 by 6 puzzle L. 5 6 6 3 5 3 3 2 5 4 1 5 For answers click once.
  • 25. Hard 6 by 6 puzzle L. 1 5 6 2 3 4 4 6 1 3 2 5 3 2 4 5 1 6 5 1 2 4 6 3 2 3 5 6 4 1 6 4 3 1 5 2
  • 26. Hard 6 by 6 puzzle M. 5 1 2 6 2 4 6 5 2 3 1 2 For answers click once.
  • 27. Hard 6 by 6 puzzle M. 3 4 5 1 2 6 6 5 2 4 1 3 1 2 3 6 4 5 2 6 4 3 5 1 4 1 6 5 3 2 5 3 1 2 6 4
  • 28. 9 6 2 7 N. 4 3 8 6 8 1 9 2 1 5 8 3 4 9 puzzle 7 9 9 8 6 5 1 3 9 by 9 5 9 7 3 2 9 6 4 8 4 2 1 5 For a hint click once; for answers click twice.
  • 29. 5 9 3 8 6 2 1 4 7 N. 7 2 4 1 5 3 9 8 6 6 8 1 9 7 4 2 3 5 1 5 8 3 4 9 7 6 2 puzzle 3 7 6 5 2 1 4 9 8 2 4 9 7 8 6 5 1 3 9 by 9 8 1 5 6 9 7 3 2 4 9 6 2 4 3 5 8 7 1 4 3 7 2 1 8 6 5 9

Editor's Notes

  1. Sudoku techniques Sudoku solving technique #1 Sole Candidate When all the other possibilities for the sudoku cell have been removed, and only one choice remains - then it must be the correct value. Sudoku solving technique #2 Unique Candidate If a cell is the only one in the row that can contain a certain number, then it must have that number. This is because every row of the sudoku must have each of the values 1-9. The same applies to columns and 3x3 blocks in the sudoku. Sudoku solving technique #3 Col/Row/Block interactions If you know that a number must occur in a certain row, then you can eliminate that number as a possibilty for other blocks in the same row. Eg, if you know that the number 4 must appear in the 1st row of block 1 (2nd and 3rd rows being full) then you know that the number 4 cannot occur in block 2 or 3 in the sudoku. This applies to columns as well. Sudoku solving technique #4 Naked subset if 2 squares in the same col/row/block have the same 2 candidates, then you can remove those numbers as candidates in the same col/row/block. This rule extends to cover 3 squares with the same 3 candidates, 4 etc.