This bridge-building simulator will test your engineering creativity, it has 105 different scenarios where in each one you have to figure out a workable solution with the limited Tools you have at your disposal to get vehicles of various shapes and sizes on one side of a virtual river safe and sound to the other side.
There are all kinds of structures you can build, these range from light car bridges to multi-deck draw-bridges and jumps. To successfully complete the levels willl require not only imagination, but also a basic knowledge of physics. In addition to the problem-based campaign mode, there's also a sandbox mode where you can just build horrific monstrosities for fun.
The game is available for $4.99 on iOS