A free app for iPhone, by Headup GmbH.

Build a beautiful bridge and span the deepest valleys, canals, and rivers. The choice of materials is yours: wood, steel, concrete, or metal. Each material offers you a variety of options and solutions, and you can build the bridge of your dreams in any way you choose. Your budget is the only limit. And if you run into a dead end, you can pick up valuable tips from the help system!

The Bridge Constructor+ add-ons are not available for free. You need to subscribe to the Slope + Trains or the Bridge Constructor+ and you will be able to play these fun, challenging levels. You can find out more information about the add-ons on the official website.