Sudoku #h255

Sudoku game, level: Hard #255. This Sudoku have 25 given numbers (clues)..
Structure: 1 (1 pcs.), 7 (1 pcs.), 8 (2 pcs.), 5 (2 pcs.), 4 (3 pcs.), 9 (3 pcs.), 2 (4 pcs.), 6 (4 pcs.), 3 (5 pcs.), ∑25.


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