PlaySudoku.us
Medium · Puzzle #31
4
5
7
8
7
3
8
1
2
1
4
2
1
9
4
2
7
8
3
8
9
1
4
5
3
4
9
2
4
9
6
7
1
On average, a hard Sudoku requires 50–100 candidate eliminations before the grid is fully solved.
On average, a hard Sudoku requires 50–100 candidate eliminations before the grid is fully solved.
Naked Singles are your fastest technique. Exhaust them completely before moving to more complex methods.
Naked Singles are your fastest technique. Exhaust them completely before moving to more complex methods.