9
5
7
9
5
3
2
1
6
6
4
8
9
3
8
2
9
7
6
3
4
1
7
7
1
8
2
4
2
9
8
The Times Sudoku Championship in the UK has been held annually since 2005, drawing hundreds of competitors.
The Times Sudoku Championship in the UK has been held annually since 2005, drawing hundreds of competitors.
Irregular Sudoku (also called Squiggly Sudoku) uses non-rectangular regions instead of 3×3 boxes, requiring different solving strategies.
Irregular Sudoku (also called Squiggly Sudoku) uses non-rectangular regions instead of 3×3 boxes, requiring different solving strategies.