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Medium · Puzzle #581
4
6
2
7
3
6
5
8
2
9
5
2
3
6
4
5
9
6
3
7
9
8
2
8
3
8
3
1
7
8
1
5
9
4
Scan by digit rather than by cell: find everywhere '7' must go before switching to '8'.
Scan by digit rather than by cell: find everywhere '7' must go before switching to '8'.
The first Sudoku World Championship was held in Lucca, Italy, in 2006.
The first Sudoku World Championship was held in Lucca, Italy, in 2006.