*-----------*
|..8|65.|..1|
|3.2|.1.|...|
|.4.|..7|...|
|---+---+---|
|457|...|9..|
|68.|...|.12|
|..9|...|354|
|---+---+---|
|...|7..|.6.|
|...|.9.|2.8|
|5..|.68|1..|
*-----------*