Sudoku #h674

Sudoku game, level: Hard #674. This Sudoku have 28 given numbers (clues)..
Structure: 4 (2 pcs.), 3 (2 pcs.), 5 (2 pcs.), 9 (3 pcs.), 6 (3 pcs.), 1 (3 pcs.), 7 (4 pcs.), 2 (4 pcs.), 8 (5 pcs.), ∑28.


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8
4
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7
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4
9
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5
9
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6
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5
7
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9
6
3
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