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Sudoku puzzles 4x4 (Su Doku)

My database includes 34183 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every 4x4 box contains the digits 1 through 16. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

6572768 puzzles downloaded.

          12         15   11 16   4
  4 2 1 16 11 9   8           3 7
10 5 11   15     8     4          
  9               11 1   8 2 12  
      16   3   4 9     10   14   1
11   10 5           12   4 3      
  12 7 9         13       6      
2 14     11       3 8   1        
        12   13 10       11     14 2
      4       14         5 1 11  
      12 6   2           13 8   3
7   8   9     1 2   14   4      
  7 9 3   1 16               15  
          10     12     16   6 8 5
14 16           9   15 3 7 1 13 2  
8   12 11   7         13          
Showing puzzle number: 19874
Puzzletype: Symmetrical Sudoku
Startnumbers: 100
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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