Sudoku #h77

Sudoku game, level: Hard #77. This Sudoku have 27 given numbers (clues)..
Structure: 4 (2 pcs.), 6 (2 pcs.), 9 (2 pcs.), 7 (3 pcs.), 8 (3 pcs.), 5 (3 pcs.), 1 (3 pcs.), 3 (4 pcs.), 2 (5 pcs.), ∑27.


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