*-----------*
|...|1.4|29.|
|.3.|9..|..1|
|...|..5|..8|
|---+---+---|
|..3|...|.6.|
|62.|893|.45|
|.8.|...|9..|
|---+---+---|
|3..|4..|...|
|1..|..9|.8.|
|.68|2.1|...|
*-----------*