Fantastic Contraption is a really fun little web game. Simple goal, just get the red block inside the goal area using a small array of tools. As with most physics games though, the fun is in creating wacky things. Add the ability to share your contraptions with others via a link, and we’re all set.
Here are some of my others:
Two Way, Caterpillar, Jumper, Crawler, and my favorite, Lift.
Also, Joel is great at creating walkers.
Give it a try.

http://FantasticContraption.com/?designId=3141594
That is excellent. You may enjoy:
http://FantasticContraption.com/?designId=2949589
One of mine!