PlaySudoku.us
Hard · Puzzle #299
2
4
4
2
5
2
6
1
9
7
3
4
4
3
8
1
7
4
8
2
3
1
3
9
8
1
6
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.