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Sudoku puzzles diagonals (Su Doku)

My database includes 5816 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 diagonals must also contain 1 through 16. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

1153565 puzzles downloaded.

      3 7   15   11              
13     12     9       15     14 11 10
                13 14            
1 11   15     2 16           7   3
  12 1 2 13       14           6  
    9   10   1       5   7   2 4
  13     16 4       2     3 5   9
6   3         8     16 4       13
9       8 13     4         12   2
2   11 13     10       14 3     7  
5 14   8   7       9   12   4    
  7           5       10 11 3 16  
14   7           8 15     9   1 16
            3 7                
12 16 6     1       7     2     5
              10   4   6 14      
Showing puzzle number: 2971
Puzzletype: Symmetrical Sudoku
Startnumbers: 92
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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