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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.

242559 puzzles downloaded.

  9 5                       15  
13     16     9       15   12     4
14 6       16   8   7   5        
15       5                 14 13  
            6     16 9     13    
9                     6 7 11 1 10
              4   10       8 16 15
1         7     11 13 2   14      
      8   5 13 12     10         2
11 14 13       16   1              
4 5 7 6 9                     12
    9     1 8     3            
  8 3                 13       11
        2   10   6   8       7 9
5     1   4       2     3     14
  2                       5 6  
Showing puzzle number: 604
Puzzletype: Symmetrical Sudoku
Startnumbers: 80
Difficulty: Super easy (0)
Solution methods: SiSo
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