PlaySudoku.us
Hard · Puzzle #226
6
2
5
7
3
4
3
1
3
8
5
6
1
9
7
2
5
7
9
1
4
7
3
2
5
1
The first Sudoku software app appeared in 2005 and became one of the most-downloaded mobile apps of that year.
The first Sudoku software app appeared in 2005 and became one of the most-downloaded mobile apps of that year.
"Curiosity is the engine of achievement." — Ken Robinson
"Curiosity is the engine of achievement." — Ken Robinson