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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.

486340 puzzles downloaded.

      2   10     1 11   5
        9 11   8     7 6
  11 7       12     3    
10       12 7   5       9
              11 4     2
  4   9   6         1  
  7         8   5   11  
11     8 10              
1       2   11 12       7
    11     3       12 6  
7 9     8   6 2        
3   4 7     5   8      
Showing puzzle number: 139
Puzzletype: Symmetrical Sudoku
Startnumbers: 52
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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