The concept of Bridge Building Game is still the same as in the classic game: Your task is to build a bridge which has to support a passing train and stay undamaged. Actually, it doesn't necessarily have to stay undamaged, the train just has to pass to the other side safely... Each bridge element is $100 and your budget is limited. The process is simulated using a fairly realistic physics engine and rendered in real time.
The new version adds some of the features knows from BCS like copy & paste or flip x. The sim also shows tension (different shades of blue) and pressure (red) like BCS does. You can also alter the weight of the train. Old Bridge Builder levels can be converted using Schlumpfine's converter tool.
There are many ways to play Bridge Building Game: you can choose just to build working bridges so you can pass all levels quickly (more or less). If that's not enough, you can try to optimize your bridges to be as cost-effective as possible (see the Records section in the Forum). Of course, you can also forget sommon sense and build crazy and weird bridges, try to make them look particularly nice, or even cunstruct complex mechanisms..., just for the fun of it... The game sets no limits for your creativity!