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Sudoku puzzles irregular (Su Doku)

My database includes 1031 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every box contains the digits 1 through 12. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

692699 puzzles downloaded.

    8 5       2   1   12
  1       11         4  
10               3      
    11     3   4     7 10
2   1       3          
      10 5       8 6    
    5 8       10 4      
          9       5   7
7 8     12   6     9    
      7               1
  2         11       9  
1   4   11       12 2    
Showing puzzle number: 136
Puzzletype: Symmetrical Sudoku
Startnumbers: 44
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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