Following in the footsteps of 2D Boy and Paul Eres, Petri Purho is celebrating the one-year anniversary of Crayon Physics Deluxe's release by selling the game off for whatever price you choose.

Simply head on over to the CPD site, name your price, and away you go with all its wonderful physics-based crayon-ness. The sale lasts just a week (until 15th Jan) and we're bound to see some results popping up on his site shortly afterwards.