The idea is simple, get your armadillo ball to the blue portal, to get there you have some matterials, rubber,rope,metal sheet, metal bar, bungie cord, cloth. and a rocket. You make up contraptions and paths to get your ball to the portal. It's is a very realistic game, Cloth Rope and Bungie Cord have high tensile strength, wereas steel plate will snap easily under load bearing situations. You can set delays for things to snap, tension or compression settings etc etc.
Theres a free demo and the game is 19.99 dollars, or free (think about it)
Random comment: I love uTorrent [/hint]
PM's are such a great idea also. [/ hint #2]
Here's the main website, from which you can download the demo, look at all the great reviews, view the forum and download extra maps etc >
Armadillo Run
Have funs guys !