*-----------*
|.64|..2|1..|
|.1.|.8.|...|
|.7.|...|3.2|
|---+---+---|
|...|7..|6.3|
|...|8.5|...|
|7.6|..1|...|
|---+---+---|
|9.3|...|.4.|
|...|.2.|.3.|
|..1|6..|78.|
*-----------*