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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.

243632 puzzles downloaded.

                    10     1    
        8           5       3  
8       9     3     16 15 13     10
      14   11 7 6   9         5  
      8 14   2   12     11        
          3 10   5           4 13
  7           16   8   14 5      
    3   6     8 4       2   14  
  3   15       1 16     5   13    
      16 3   14   1           7  
1 13           12   3 6          
        7     11   13   2 1      
  5         3   11 6 12   8      
6     1 15 9     14     3       7
  12       16           9        
    2     7                    
Showing puzzle number: 144
Puzzletype: Symmetrical Sudoku
Startnumbers: 78
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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