These guys must be crazy! They are racing against each other over the rooftops. Of course, they can’t cross the gaps on their feet, so they use rails instead. When the improvised bridge between two roofs is ready, all you need to do is slide from one side to the other. But the rails won’t appear on their own! You have to gather enough material for them along the way. If there isn’t a sufficient amount of boards in your inventory, the rails will be too short and you won’t be able to continue the race. Keep yourself well-stocked!