Sudoku #m688

Sudoku game, level: Medium #688. This Sudoku have 23 given numbers (clues)..
Structure: 7 (1 pcs.), 1 (2 pcs.), 8 (2 pcs.), 9 (2 pcs.), 6 (2 pcs.), 5 (3 pcs.), 2 (3 pcs.), 3 (4 pcs.), 4 (4 pcs.), ∑23.


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