Crayon Physics

http://www.vimeo.com/1849263
Crayon Physics was built by a student at Helsinki Polytechnic named Petri Purho. It’s a 2D physics puzzle / sandbox game, in which players get to experience what it would be like if their drawings would be magically transformed into real physical objects. It won the Independent Games Festival Prize in 2008 and you can add it to your iPhone for $5 too.