Sudoku #x636

Sudoku game, level: Expert #636. This Sudoku have 25 given numbers (clues)..
Structure: 4 (1 pcs.), 5 (1 pcs.), 3 (2 pcs.), 1 (3 pcs.), 2 (3 pcs.), 6 (3 pcs.), 7 (3 pcs.), 8 (4 pcs.), 9 (5 pcs.), ∑25.


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