Build a loop between the starting cities so that they can trade farm machinery. Connect Rotterdam to Mons, Mons to Bruges, and Bruges back to Rotterdam to complete the loop.
Build a loop between the German cities so they can trade sauerkraut recipes. Connect Hamburg to Berlin, Berlin to Bastei, Bastei to Stuttgart, Stuttgart to Cologne, and Cologne back to Hamburg.
Build a loop between the French Cities so that they can trade the zippiest of scooters. Connect Paris to Lyon, Lyon to Verdon, Verdon to Marseille, Marseille to Millau, and Millau back to Paris.
Build a loop between the locations with bridges as no one is currently maintaining the bridges! Connect London to Bastei, Bastei to Prague, Prague to Millau, and Millau to London to complete the loop.
Build a loop between the Port locations to prove that trains are better. Connect Grimsby to Rotterdam, Rotterdam to Hamburg, Hamburg to Stuttgart, Stuttgart to Marseille, Marseille to Dijon, and Dijon back to Grimsby.
Build a loop between the Capital Cities so that they can trade statues. Connect: Edinburgh, Amsterdam, Copenhagen, Berlin, Warsaw, Prague, Paris, and London back to Edinburgh to create a loop.
Build a loop around the North Sea. Connect Edinburgh, Gothenburg, Copenhagen, Hamburg, Amsterdam, Rotterdam, Bruges, London, Grimsby, and back to Edinburgh to create a loop.