Sudoku #m779

Sudoku game, level: Medium #779. This Sudoku have 23 given numbers (clues)..
Structure: 4 (1 pcs.), 5 (2 pcs.), 6 (2 pcs.), 7 (2 pcs.), 1 (3 pcs.), 2 (3 pcs.), 8 (3 pcs.), 9 (3 pcs.), 3 (4 pcs.), ∑23.


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