PlaySudoku.us
Medium · Puzzle #828
5
2
7
9
8
6
8
2
4
5
3
6
2
7
1
5
1
2
4
4
9
5
1
2
3
7
2
1
9
3
4
6
4
1
8
3
"If you spend too much time thinking about a thing, you'll never get it done." — Bruce Lee
"If you spend too much time thinking about a thing, you'll never get it done." — Bruce Lee
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.