In this program you design and build bridges. Once your bridge design is completed it is tested by trains and other vehicles traveling across it. As you watch, the vehicles will either pass over safely or plummet into the river below, depending on the success of your design. The 3D graphics engine allows you to view your bridge from any angle including a first-person train view. It includes many types of levels varying in difficulty from simple to complex and a level editor in which you can create your own levels and trade with other people.