*-----------*
|..3|..9|..6|
|.1.|7..|94.|
|9..|8..|.52|
|---+---+---|
|..1|..4|...|
|...|128|...|
|...|9..|2..|
|---+---+---|
|68.|..1|..9|
|.57|..2|.1.|
|1..|4..|5..|
*-----------*