4
8
7
5
3
7
2
3
4
8
6
5
9
3
6
2
9
8
6
5
1
8
6
3
2
9
2
6
8
4
1
3
9
7
3
5
Sudoku appeared as a puzzle category on Jeopardy! during the height of its US popularity in 2005–2006.
Sudoku appeared as a puzzle category on Jeopardy! during the height of its US popularity in 2005–2006.
A Sudoku grid can be solved using only row and column logic, never needing box constraints — but it becomes exponentially harder.
A Sudoku grid can be solved using only row and column logic, never needing box constraints — but it becomes exponentially harder.