Sudoku #x549

Sudoku game, level: Expert #549. This Sudoku have 28 given numbers (clues)..
Structure: 3 (2 pcs.), 4 (2 pcs.), 6 (2 pcs.), 1 (3 pcs.), 2 (3 pcs.), 5 (4 pcs.), 7 (4 pcs.), 8 (4 pcs.), 9 (4 pcs.), ∑28.


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