Rag Doll Kung Fu: Fists of Plastic, based upon Rag Doll Kung Fu, is a PSN exclusive downloadable game. The game was temporarily free in the US boosting sales for the game. It features new gameplay using the buttons of the PlayStation controller to make the character punch and kick. It also features "Chi Moves" like the Lighting ball or Meditation and a character designer. Source: Wikipedia, "Rag Doll Kung Fu", available under the CC-BY-SA License.