+-----+
|#4## |
|  # #|
| 2 3#|
|1# 0 |
+-----+
Location (1,0) = 4
Location (1,2) should be 2 is 1
Location (3,2) should be 3 is 2
Location (0,3) = 1
Location (3,3) = 0
Puzzle is NOT SOLVED