Sorry, second to last line should read as follows: this(new Counter());

@nolttr21 Better is to pass the score value (or the Counter object itself -- easier) from world to world by adding an extra World subclass constructor to ALL worlds like this: public MyWorld(Counter counter) { super( // world dimensions addObject(counter, // counter location coordinates // etc. } The original MyWorld constructor can utilize the new one with this: public MyWorld() { this(counter); }