- Each horizontal row contains each digit exactly once
- Each vertical column contains each digit exactly once
- Each subgrid or region contains each digit exactly once
In Japanese, sudoku means something like "numbers singly".
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5
|
|
3
|
|
1
|
3
|
|
1
|
|
5
|
|
2
|
|
4
|
|
1
|
3
|
|
1
|
|
4
|
|
2
|
|
3
|
|
1
|
|
5
|
1
|
|
5
|
|
3
|
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