PlaySudoku.us
Hard · Puzzle #213
4
7
8
3
5
4
3
6
1
1
4
2
7
4
5
7
9
2
6
9
2
7
3
6
8
9
4
5
The average newspaper Sudoku takes about 20 minutes to solve for an experienced solver.
The average newspaper Sudoku takes about 20 minutes to solve for an experienced solver.
In 2013, researchers proved computationally that every valid 16-clue Sudoku puzzle has a non-unique solution — 17 is truly the minimum.
In 2013, researchers proved computationally that every valid 16-clue Sudoku puzzle has a non-unique solution — 17 is truly the minimum.