on the underground challenge paris new york uitbreiding engIn "The Underground Challenge" you compete against real metro lines. The map starts with several lines already built, and you have to try to get a higher score than the Underground. Just like the engineering teams of the Underground, you have to be very inventive in building railways while at the same time diverting passengers to use your own lines instead of the official ones. If you can beat the Underground at its own game before the Destination