Crayon Physics Deluxe is a computer video puzzle game designed by Petri Purho and released on January 7, 2009. An early version, titled Crayon Physics, won the grand prize at the Independent Games Festival in 2008. It features a heavy emphasis on two-dimensional physics simulations, including gravity, mass, kinetic energy and transfer of momentum. The game includes a level editor and enables its players to share and download custom content via an online service.