no i dont think he is complaining that he could jump walls to make things easier i think he just thought it was a bug not by design 

You didn't catch the hint. 

panteraa is right, i was not complaining.  i didnt know it was intentional.

Well, there's no problem Don't worry about it

Some tiles are not walkable. However, those walls are made from two walkable tiles, so there is no boundary in place by design.