Sudoku #h663

Sudoku game, level: Hard #663. This Sudoku have 27 given numbers (clues)..
Structure: 7 (1 pcs.), 5 (1 pcs.), 3 (3 pcs.), 1 (3 pcs.), 4 (3 pcs.), 9 (4 pcs.), 8 (4 pcs.), 6 (4 pcs.), 2 (4 pcs.), ∑27.


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