*-----------*
|8.5|...|..9|
|...|...|68.|
|.97|.8.|...|
|---+---+---|
|6..|8.4|9..|
|.3.|6.1|.7.|
|..9|5.7|..3|
|---+---+---|
|...|.5.|29.|
|.58|...|...|
|9..|...|7.1|
*-----------*