Magic Pen is a new online game created by programmer Alejandro Guillen. In a nutshell it's a flash version of last year's Crayon Physics which was created by Finnish computing science student Petri Purho.
Crayon Physics and Magic Pen the game are 2D physics puzzle game in which your drawings are transformed into real physical objects. You have to draw certain shapes to move a ball to a specific target on the screen. It sounds much easier than it is.
Guillen's version of Crayon Physics has around twenty-four levels, a really nice interface and is highly addictive. Check out Magic Pen the game yourself here.