Algodoo

A simple rube goldberg machine (well, simple compared to some other
stuff I've seen). Just press ENTER or RETURN to begin the chain reaction
after starting the simulation. The end goal is the huge rocket to the left
should take off and fly away into the unknown (the killer planes bordering
the simulation)!

NOTE: The 2 rail cart-thingies might get stuck on each other sometimes,
its pretty rare, but all you have to do is prod them along with the drag tool
or reloading the simulation!