Sudoku #h20

Sudoku game, level: Hard #20. This Sudoku have 27 given numbers (clues)..
Structure: 4 (1 pcs.), 8 (2 pcs.), 2 (2 pcs.), 1 (2 pcs.), 9 (2 pcs.), 3 (3 pcs.), 6 (4 pcs.), 7 (5 pcs.), 5 (6 pcs.), ∑27.


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3
1
6
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8
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7
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7
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9
7
2
3
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