Sudoku #x331

Sudoku game, level: Expert #331. This Sudoku have 28 given numbers (clues)..
Structure: 2 (2 pcs.), 3 (3 pcs.), 4 (3 pcs.), 5 (3 pcs.), 6 (3 pcs.), 7 (3 pcs.), 8 (3 pcs.), 1 (4 pcs.), 9 (4 pcs.), ∑28.


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