PlaySudoku.us
Expert · Puzzle #173
5
2
3
8
6
1
8
6
5
3
7
4
9
6
8
7
5
9
8
2
5
9
8
1
The Times of London received so many reader letters about Sudoku in 2004 that they had to hire extra staff.
The Times of London received so many reader letters about Sudoku in 2004 that they had to hire extra staff.
Look for digits that already appear 7 or 8 times on the board — they're the easiest to place last.
Look for digits that already appear 7 or 8 times on the board — they're the easiest to place last.