Cargo Bridge Lite

One activity that the students seem to really like and challenge them is a game called Cargo Bridge Lite. The main purpose of the activity is to build bridges to transport cargo from one side to the other but if the students don't use the correct angles to build their bridge will fall. I use this for critical thinking skills and also as incentive to complete their work so they can play this game. I would like to get the full version because it is challenging and entertaining for them.