Sudoku #h729

Sudoku game, level: Hard #729. This Sudoku have 25 given numbers (clues)..
Structure: 1 (1 pcs.), 4 (2 pcs.), 9 (2 pcs.), 2 (2 pcs.), 6 (3 pcs.), 5 (3 pcs.), 3 (4 pcs.), 8 (4 pcs.), 7 (4 pcs.), ∑25.


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