*-----------*
|3..|...|...|
|8..|.92|...|
|75.|..3|219|
|---+---+---|
|64.|9..|..2|
|..8|...|9..|
|1..|..5|.86|
|---+---+---|
|576|3..|.21|
|...|27.|..8|
|...|...|..7|
*-----------*