Armadillo Run is a lovely little indie game from Peter Stock. A playset-style physics puzzle game, you have to piece together different physical objects such as cloth, rockets, struts, and plates to create a system to guide the little armadillo ball to where it wants to go.

As Matthew points out, its like a cross between The Incredible Machine and Bridge Builder. It has a really intuitive, easy to grasp user interface and encourages experimentation.

Found at Fun-Motion.