@Nikita Meteor (8 June, 2016, 4:56 PM UTC):
Not really sure what the problem is (Considering that there's only 1 actual path), but here you go :D ( http://prntscr.com/be47z0 ) (The red line goes out of the lanes a little, but they eventually re-enter their own lanes, and they never actually 'no-clip')

That's assuming you're a standard trooper, following walls.

Then there's my personal favourite :P ( http://prntscr.com/be48tb )

Because, who needs walls?

2,4,3,1 and out