GFD writes: "It's a truism that the most simple ideas and concepts can sometimes be the best. Crayon Physics is a remarkably simple game that revolves around getting a ball to touch a star on the same screen. But the magic is far deeper than that. On your sheet of virtual paper whatever you draw come to life – draw a circle and it will become a ball rolling down a slope, draw a pivot and a straight line and you'll have yourself a see-saw to send things flying through the air. Rope and pulley system? Just sketch out string and square blocks. Need a car? Two circles and a box will do the trick."