Sudoku #h823

Sudoku game, level: Hard #823. This Sudoku have 28 given numbers (clues)..
Structure: 4 (1 pcs.), 2 (3 pcs.), 5 (3 pcs.), 6 (3 pcs.), 7 (3 pcs.), 9 (3 pcs.), 1 (4 pcs.), 3 (4 pcs.), 8 (4 pcs.), ∑28.


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8
5
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