PlaySudoku.us
Medium · Puzzle #400
3
1
8
9
4
6
4
5
9
6
3
2
9
7
6
1
3
9
8
4
7
4
6
3
1
5
7
3
9
4
3
4
8
6
"Mathematics takes us into the region of absolute necessity, to which not only the actual world, but every possible world, must conform." — Bertrand Russell
"Mathematics takes us into the region of absolute necessity, to which not only the actual world, but every possible world, must conform." — Bertrand Russell
A Sudoku grid can be solved using only row and column logic, never needing box constraints — but it becomes exponentially harder.
A Sudoku grid can be solved using only row and column logic, never needing box constraints — but it becomes exponentially harder.