Because the hero is passed to your WaterWorld world, you have enough information in the constructor to set the score counter of that new world to that of the old one. However, you must execute the following line first (before adding the hero into the new world): as once you add the hero to the new world, any reference to the old one is lost. Then, after you add the new Score object into the new world (via the call to the 'resetScore' method), you can execute the following line to set the current score: