*-----------*
|.1.|42.|...|
|.49|..8|..2|
|...|...|4..|
|---+---+---|
|9.4|.5.|2.8|
|.5.|.4.|.7.|
|7.3|.8.|5.9|
|---+---+---|
|..5|...|...|
|8..|6..|35.|
|...|.94|.2.|
*-----------*