PlaySudoku.us
Hard · Puzzle #685
6
8
9
3
6
7
5
9
3
1
1
2
6
5
4
6
8
7
9
1
7
3
2
8
5
6
8
9
1
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.
"Every master was once a disaster." — T. Harv Eker
"Every master was once a disaster." — T. Harv Eker