*-----------*
|32.|...|1..|
|..8|..2|...|
|...|1.8|..7|
|---+---+---|
|8..|.4.|23.|
|...|...|...|
|.61|.3.|..4|
|---+---+---|
|5..|7.1|...|
|...|6..|4..|
|..9|...|.16|
*-----------*