Sudoku #h400

Sudoku game, level: Hard #400. This Sudoku have 28 given numbers (clues)..
Structure: 6 (2 pcs.), 4 (2 pcs.), 8 (3 pcs.), 7 (3 pcs.), 5 (3 pcs.), 2 (3 pcs.), 9 (4 pcs.), 3 (4 pcs.), 1 (4 pcs.), ∑28.


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9
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6
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7
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9
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5
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9
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6
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9
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8
4
2
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