*-----------*
|..9|..3|...|
|87.|...|6..|
|..3|..8|2.4|
|---+---+---|
|...|..5|.26|
|...|6.9|...|
|56.|8..|...|
|---+---+---|
|1.5|9..|8..|
|..2|...|.65|
|...|7..|9..|
*-----------*