Sudoku #h25

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


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