This is a very simple game in which you have to build bridges over water using a certain budget. You do this by drawing lines and drawing them so the bridge won't collapse. When you've done this you can start a train which will start running over the bridge, so it has to keep the weight of the train. If the bridge can hold the weight you go to the next level. If not you have some design flaws and have to rebuild part of the bridge so it's safer.