PlaySudoku.us
Hard · Puzzle #183
2
6
1
4
8
6
3
8
9
6
3
7
2
4
5
6
2
5
7
5
7
4
9
5
1
4
The longest Sudoku solving session in a competitive setting lasted over 8 hours — an endurance format.
The longest Sudoku solving session in a competitive setting lasted over 8 hours — an endurance format.
Work the most constrained areas first — rows, columns, or boxes that already have the most filled digits.
Work the most constrained areas first — rows, columns, or boxes that already have the most filled digits.