Crayon Physics is a 2D physics puzzle / sandbox game, in which you get to experience what it would be like if your drawings would be magically transformed into real physical objects. Solve puzzles with your artistic vision and creative use of physics. www.crayonphysics.com

Never heard of it..

I've heard of it. I heard of it here: http://forum.toribash.com/showthread.php?t=69094
And I heard of it way before too.

Try using search first?