Sudoku #x259

Sudoku game, level: Expert #259. This Sudoku have 25 given numbers (clues)..
Structure: 7 (1 pcs.), 4 (2 pcs.), 9 (2 pcs.), 6 (2 pcs.), 8 (3 pcs.), 1 (3 pcs.), 5 (4 pcs.), 2 (4 pcs.), 3 (4 pcs.), ∑25.


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