Continuing the App Store’s App of the week promotion, Catapult King by Chillingo has been marked down from $0.99 to free. In Catapult King, you take down forts, castles and other medieval structures through the flicking of a catapult. The catapult can be upgraded to make your flicks even more deadly, and the destroyable structures vary greatly. Catapult King is a universal app currently carrying a 4-star rating on the iTunes store, If you’re looking for a fun distraction, then check it out here.