Judging by the image posted by @iandotkelly there is one more thing that makes the desired maze stand out.

It is a maze within a maze within a maze. It is constructed of several layers of mazing, very similar to the dreams that the team has to navigate through later on.

So by designing the last maze, ariadne has used the same concept that they are planning to use later on in their dreams. 


And if the maze is really unsolveable - at least for Dom - that might be a further hint of him not being able to escape the last layer of the maze he is actually in throughout the entire movie.