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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.

187059 puzzles downloaded.

15 9                 16          
7             16   12   14 11      
    3 14 1           6 13       9
    1         5     8          
      16     11             14    
  2     16   10   12 3         11 15
    7   3           4       1  
5     9   1   13 7 11       10   8
16   15       1 9 3   2   6     12
  10       16           12   4    
8 6         2 10   4   7     15  
    2             9     14      
          2     13         12    
6       10 14           9 2 11    
      1 5   16   14             3
          12                 5 10
Showing puzzle number: 498
Puzzletype: Symmetrical Sudoku
Startnumbers: 78
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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