Sudoku #x415

Sudoku game, level: Expert #415. This Sudoku have 28 given numbers (clues)..
Structure: 1 (2 pcs.), 2 (2 pcs.), 3 (2 pcs.), 8 (2 pcs.), 4 (4 pcs.), 5 (4 pcs.), 6 (4 pcs.), 7 (4 pcs.), 9 (4 pcs.), ∑28.


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