Sudoku #m17

Sudoku game, level: Medium #17. This Sudoku have 25 given numbers (clues)..
Structure: 2 (1 pcs.), 5 (2 pcs.), 1 (3 pcs.), 3 (3 pcs.), 6 (3 pcs.), 7 (3 pcs.), 8 (3 pcs.), 9 (3 pcs.), 4 (4 pcs.), ∑25.


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