PlaySudoku.us
Easy · Puzzle #450
4
1
4
3
9
4
5
3
9
2
8
1
4
3
6
9
8
6
9
7
4
3
9
7
8
2
1
6
5
6
8
9
9
2
8
5
3
7
7
3
9
4
2
"Knowing yourself is the beginning of all wisdom." — Aristotle
"Knowing yourself is the beginning of all wisdom." — Aristotle
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.