Sudoku #x218

Sudoku game, level: Expert #218. This Sudoku have 31 given numbers (clues)..
Structure: 6 (1 pcs.), 8 (2 pcs.), 1 (3 pcs.), 4 (3 pcs.), 9 (4 pcs.), 5 (4 pcs.), 2 (4 pcs.), 3 (5 pcs.), 7 (5 pcs.), ∑31.


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