Grab the rails, then descend to the following roof! Use the longest rail you can to leap from one roof to the next.

In the casual game Roof Rails, your character must jump from one roof to the next while gripping particularly long rails to keep them up.

In Roof Rails, much like in previous games, your goal is to move through the environments without meeting your demise. Making ensuring your rail is long enough to support you when you need it most will help you achieve this. You'll encounter obstacles that will shorten and cut your rail as your character sprints along the levels.  So you need to make sure you run over and collect the little pieces of rail that you see scattered around the roofs.