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Sudoku puzzles (Su Doku)

My database includes 10934 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every 3x4 box contains the digits 1 through 12. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

2276478 puzzles downloaded.

    3 11     7 4 10      
  6   10     11     2    
  5     2 1 9         3
8   6       4         1
  1   2       9       10
12         2     9   7  
  11   1     2         9
3       8       4   6  
9         3       11   8
2         4 10 6     5  
    1     11     12   4  
      12 1 5     11 3    
Showing puzzle number: 6256
Puzzletype: Symmetrical Sudoku
Startnumbers: 52
Difficulty: Very hard (0)
Solution methods: SiSo SC SB DC SF
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