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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.

    6     7       15 11 16 5     1
    8         9 7   1         10
  7         15                 9
  2   13 3           9   14 16 7  
15     2 7   11     12 3       4 14
9 5         4   13 7   1       3
          8           6       2
  13 7   2     6 16 10 15     1 12  
  8 1     11 14 13 12     10   4 9  
7       12           13          
5       4   2 7   8         10 6
2 12       9 6     1   11 13     16
  14 2 8   5           13 9   15  
16                 2         3  
13         3   11 1         12    
10     7 14 2 12       16     11    
Showing puzzle number: 15657
Puzzletype: Symmetrical Sudoku
Startnumbers: 98
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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