PlaySudoku.us
Expert · Puzzle #577
8
6
3
9
3
5
1
6
1
9
4
8
5
9
7
4
3
8
7
4
6
1
3
1
6
4
7
There are Sudoku variants with extra constraints: Killer Sudoku (cage sums), Diagonal Sudoku, and even 3D Sudoku.
There are Sudoku variants with extra constraints: Killer Sudoku (cage sums), Diagonal Sudoku, and even 3D Sudoku.
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.