Sudoku #x680

Sudoku game, level: Expert #680. This Sudoku have 25 given numbers (clues)..
Structure: 3 (1 pcs.), 6 (2 pcs.), 9 (2 pcs.), 7 (3 pcs.), 2 (3 pcs.), 1 (3 pcs.), 8 (3 pcs.), 5 (4 pcs.), 4 (4 pcs.), ∑25.


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