PlaySudoku.us
Hard · Puzzle #173
3
9
6
2
3
5
8
6
1
4
2
8
7
3
4
1
3
3
1
6
9
2
1
4
1
5
7
3
8
"There are only two ways to live your life. One is as though nothing is a miracle. The other is as though everything is." — Albert Einstein
"There are only two ways to live your life. One is as though nothing is a miracle. The other is as though everything is." — Albert Einstein
Finnish mathematician Arto Inkala created what is widely considered the world's hardest Sudoku in 2012.
Finnish mathematician Arto Inkala created what is widely considered the world's hardest Sudoku in 2012.