Crazy Machines is yet another Rube Goldberg-like contraption game where you complete each level by making an invention work. You have a wide array for tools, and the experiements range from moving balls to target locations to illuminating a variety of lights. There are lots of levels ( 200), and a variety of ways to complete each level. Beware it is addicting!
I purchased my copy off the shelf at a local retailer, but a review can be seen at: