8
9
4
5
3
7
5
5
3
4
2
7
9
6
6
4
1
7
7
6
9
1
1
2
3
3
6
6
9
4
3
8
6
1
5
7
At peak Sudoku popularity in 2006, over 600 different Sudoku books were published in a single year.
At peak Sudoku popularity in 2006, over 600 different Sudoku books were published in a single year.
"No great mind has ever existed without a touch of madness." — Aristotle
"No great mind has ever existed without a touch of madness." — Aristotle