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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.

280517 puzzles downloaded.

  15               11            
11       1     5     4   16 8   9
6         15     16   5     11 4 12
        13       9 10       15   7
  14   16               7        
12           8 7   9     6     16
  13 8       16               9  
15 9 5       2 4 8       14     13
3     5       11 12 4       7 14 8
  12               7       13 16  
14     7     15   1 6           5
        16               12   1  
16   6       5 13       12        
8 11 14     10   1     3         6
13   10 2   8     11     6       4
            11               8  
Showing puzzle number: 481
Puzzletype: Symmetrical Sudoku
Startnumbers: 84
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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