A bridge construction puzzle game that goes strong on sandbox flexibility. Whatever you build, however you build it, it has to be strong enough to make vehicles, each with different weight, pass through. Make your bridge in 2D mode and test it out in 3D. Fail, try again. And again. And again.
Not very new in terms of mechanics, but the low poly graphics and the community make up for it. Also, it has great tools for creating your own endless fun.