Crayon Physics is a freeware puzzle game designed released on 2007. Its object is to guide a ball to a goal point marked by a star.The original game was developed in the span of less than a week using resources freely available under the Creative Commons license. A level editor was released on June 30.

Wikipedia : http://en.wikipedia.org/wiki/Crayon_Physics
Author site : http://www.kloonigames.com/crayon/