This Flash game is more fun than it should: the goal is simple - all you need to do is use your magic pen and draw circles, rectangles and other shapes to push the red circle toward the flag.
But the principles of physics, darn them, are always trying to thwart what you're doing: Link [Flash game] - Thanks CheeseDuck!
I've spent far far to much time on this.
Was a very fun game though :)