Sudoku #h512

Sudoku game, level: Hard #512. This Sudoku have 28 given numbers (clues)..
Structure: 1 (2 pcs.), 5 (2 pcs.), 9 (3 pcs.), 3 (3 pcs.), 6 (3 pcs.), 2 (3 pcs.), 4 (4 pcs.), 7 (4 pcs.), 8 (4 pcs.), ∑28.


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8
4
2
9
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2
6
4
9
8
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3
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6
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4
3
5
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