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How To Make A Game Like Fruit Ninja With Box2D and Cocos2D 

http://www.raywenderlich.com/14302/how-to-make-a-game-like-fruit-ninja-with-box2d-and-cocos2d-part-1 
http://www.raywenderlich.com/14393/how-to-make-a-game-like-fruit-ninja-with-box2d-and-cocos2d-part-2 
http://www.raywenderlich.com/14439/how-to-make-a-game-like-fruit-ninja-with-box2d-and-cocos2d-part-3