title: Cocos2d + Box2d or Chipmunk
body: <p>OK, im trying to make an iphone version of a game i made here <a href="http://scratch.mit.edu/projects/techy/781198" rel="noreferrer">http://scratch.mit.edu/projects/techy/781198</a> is box2d or chipmunk better and where are some tutorials for each one</p>