The focus of this thesis is to examine if it is possible to increase player retention in a serious game simply by adding a number of game elements that do not aid in the games serious purpose. In order to study this two versions of a serious game called Frogsnap, one with these elements and one without, are examined. The results from this examination is that the game elements managed to increase the time participants interacted with the game, and how many levels they completed. But they did not increase the amount of data that the game collected, which means that they alone did not manage to make the game more efficient in completing its purpose.