Sudoku #x840

Sudoku game, level: Expert #840. This Sudoku have 28 given numbers (clues)..
Structure: 7 (2 pcs.), 6 (2 pcs.), 5 (2 pcs.), 2 (3 pcs.), 3 (3 pcs.), 9 (4 pcs.), 8 (4 pcs.), 1 (4 pcs.), 4 (4 pcs.), ∑28.


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