Sudoku #h831

Sudoku game, level: Hard #831. This Sudoku have 25 given numbers (clues)..
Structure: 4 (2 pcs.), 5 (2 pcs.), 6 (2 pcs.), 8 (2 pcs.), 1 (3 pcs.), 3 (3 pcs.), 9 (3 pcs.), 2 (4 pcs.), 7 (4 pcs.), ∑25.


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