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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.

515493 puzzles downloaded.

    2       7 6       10
9     4         2 6   7
            9       4 3
6   8 3     1 2 7      
8       5 4       10 2 11
    11   8              
              1   9    
12 5 7       10 11       1
      9 2 8     3 1   4
7 2       6            
1   4 11         12     5
10       9 7       12    
Showing puzzle number: 639
Puzzletype: Symmetrical Sudoku
Startnumbers: 52
Difficulty: Super easy (0)
Solution methods: SiSo
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