Sudoku #h31

Sudoku game, level: Hard #31. This Sudoku have 25 given numbers (clues)..
Structure: 9 (2 pcs.), 6 (2 pcs.), 3 (2 pcs.), 7 (3 pcs.), 8 (3 pcs.), 4 (3 pcs.), 2 (3 pcs.), 1 (3 pcs.), 5 (4 pcs.), ∑25.


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9
5
2
7
6
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5
2
4
1
7
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8
6
7
2
1
5
8
8
9
5
1
3
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