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Sudoku puzzles disjoint groups (Su Doku)

My database includes 656 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. The cells with the same color must also contain the digits 1 through 16. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

256345 puzzles downloaded.

      15 16 9 12   1     14        
        10 4         13   5      
                11             3
  13     8         16   2 12     7
  16               1         15  
13               9           4 14
7         15 16 5   11   13        
15             9 16         11 2  
  4 9         8 12             1
        1   9   15 7 11         5
10 12           16               8
  1         15               12  
11     12 2   8         3     13  
4             10                
      6   5         12 11        
        6     13   4 8 16 10      
Showing puzzle number: 426
Puzzletype: Symmetrical Sudoku
Startnumbers: 72
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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