Sudoku #h539

Sudoku game, level: Hard #539. This Sudoku have 25 given numbers (clues)..
Structure: 4 (1 pcs.), 3 (2 pcs.), 6 (2 pcs.), 1 (3 pcs.), 5 (3 pcs.), 7 (3 pcs.), 9 (3 pcs.), 2 (4 pcs.), 8 (4 pcs.), ∑25.


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