Build the Bridge is a fun physics-based game that will challenge children of all ages. The goal is the build a bridge so that the train can safely move from the left. There are four track geometry cars on the New York City Subway that measure the system's track geometry to ensure that safe train operation is maintained. This website is about the bridge building games by Chronic Logic. There are currently five (!) of them: Bridge Builder(the original game from 2000), the new Bridge. Build the Bridge at Cool Math Games: Your goal is to use the pieces provided to create a safe path for the train to travel across to the tunnel.