*-----------*
|..8|3..|..2|
|4..|2..|5..|
|.3.|.64|...|
|---+---+---|
|...|9..|76.|
|.8.|...|.2.|
|.25|..1|...|
|---+---+---|
|...|73.|.5.|
|..4|..8|..3|
|2..|..5|8..|
*-----------*