Pontifex uses a complex physics engine which allows the construction of many different types of bridges. Once your design is completed, you can test the strength of your bridge by sending a ... Read allPontifex uses a complex physics engine which allows the construction of many different types of bridges. Once your design is completed, you can test the strength of your bridge by sending a train across it.Pontifex uses a complex physics engine which allows the construction of many different types of bridges. Once your design is completed, you can test the strength of your bridge by sending a train across it.