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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.

7646280 puzzles downloaded.

7       2           1 6 5 3 13 15
      15     16       13     1 14  
          14       15           2
  5 1     6 15       9 10       7
    11   12       16     2     5 10
9   8 4       16 11   5 1   12 2  
5   6     11     8         16    
10 12 2     1 8   13 9 15         4
14         8 1 3   13 11     6 15 9
    12         6     16     11   14
  1 5   11 15   13 9       16 4   3
4 9     14     12       3   7    
8       16 2       7 3     13 4  
3           13       14          
  6 16     12       2     7      
15 7 4 1 10 3           13       16
Showing puzzle number: 21408
Puzzletype: Symmetrical Sudoku
Startnumbers: 104
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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