Sudoku #x457

Sudoku game, level: Expert #457. This Sudoku have 28 given numbers (clues)..
Structure: 2 (2 pcs.), 3 (2 pcs.), 4 (2 pcs.), 8 (2 pcs.), 9 (2 pcs.), 5 (3 pcs.), 1 (5 pcs.), 6 (5 pcs.), 7 (5 pcs.), ∑28.


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