Crayon Physics Deluxe from Petri Purho on Vimeo. How many Saturday afternoons did I spend with a huge sheet of paper, a box of crayons, and visions of spaceships careening, cowboys shooting, cannonballs arching across the page? "It's a game where your crayon drawings come to life," 25-year-old independent games designer from Finland named Petri Purho. "You draw stuff and your drawings behave physically correctly. LOOK: The game trailer LISTEN: Interview with NPR's Melissa Block GET: Buy the game ($19.95) from http://www.crayonphysics.com/