2
3
8
1
6
4
5
4
1
3
3
9
5
6
8
9
6
2
4
3
3
5
4
1
2
1
4
4
9
5
2
3
7
4
9
8
2
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.
A Sudoku puzzle's 'information content' can be measured: a minimal 17-clue puzzle encodes roughly 26 bits of information.
A Sudoku puzzle's 'information content' can be measured: a minimal 17-clue puzzle encodes roughly 26 bits of information.