PlaySudoku.us
Medium · Puzzle #399
3
9
2
8
6
6
4
4
1
6
5
7
5
7
6
3
1
6
9
2
7
1
4
8
4
5
9
3
7
3
5
7
6
4
8
1
"Mathematicians do not study objects, but relations between objects." — Henri Poincaré
"Mathematicians do not study objects, but relations between objects." — Henri Poincaré
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.