Sudoku #x722

Sudoku game, level: Expert #722. This Sudoku have 28 given numbers (clues)..
Structure: 4 (1 pcs.), 7 (2 pcs.), 1 (3 pcs.), 2 (3 pcs.), 5 (3 pcs.), 3 (4 pcs.), 6 (4 pcs.), 8 (4 pcs.), 9 (4 pcs.), ∑28.


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