*-----------*
|..6|8..|149|
|.41|...|.86|
|...|..1|...|
|---+---+---|
|68.|.7.|.1.|
|...|...|...|
|.5.|.1.|.97|
|---+---+---|
|...|3..|...|
|29.|...|56.|
|173|..5|8..|
*-----------*