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Sudoku puzzles (Su Doku)

My database includes 12449 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every 3x5 box contains the digits 1 through 15. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

955063 puzzles downloaded.

13 15         7 3 11       4 9 12
    4   11   10 8   14   2      
          12   4 2   13 11      
10   5       2       1       13
8 6 3 15                 2 4  
    11         12 4 13 6   3    
3     2     15     8 5        
12   14 7 5           15 3 8   1
        1 7     3     9     10
    8   14 3 6 15         10    
  10 1                 12 7 14 15
15       12       13       11   2
      14 7   3 6   4          
      4   15   2 1   14   6    
1 8 13       12 11 14         2 3
Showing puzzle number: 8615
Puzzletype: Symmetrical Sudoku
Startnumbers: 90
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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