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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.

275268 puzzles downloaded.

  4   9 6       2   1 12     7  
      14   3             1      
  5     16   1 8       9       6
1 2 16     14   9 5              
16           11       6          
9         12             7 14   11
  7         15               2 12
            6   4           9 10
5 11           4   8            
8 9               5         16  
14   3 2             12         1
          11       7           5
              6 11   16     2 10 7
4       5       10 2   8     11  
      16             7   6      
  10     3 8   1       4 9   15  
Showing puzzle number: 34
Puzzletype: Symmetrical Sudoku
Startnumbers: 76
Difficulty: Very easy (0)
Solution methods: SiSo SC
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