I posted about the original so long ago that I can't find it in the search... maybe it was archived?
Either way I know the physics game lovers will love this game. Give it a shot... I am completely addicted. Even after completing all levels I go back and try them with different machines etc.
Basically you build a machine within the building zone to get the red object into the goal area.
Example of how many billions of ways you can do one level:
I admit... I am not nearly as good as some of these...
Fantastic Contraption
Fantastic Contraption 2