merits, and visibly show their accomplishment of levels or goals. Earning a badge can be dependent on a specific number of points or on particular activities within the game. Badges have many functions, serving as goals, if the prerequisites for winning them are known to the player, or as virtual status symbols. In the same way as points, badges also provide feedback, in that they indicate how the players have performed. Badges can influence players' behavior, leading them to select certain routes and challenges in order to earn badges that are associated with them. Additionally, as badges symbolize one's membership in a group of those who own this particular badge, they also can exert social influences on players and co-players, particularly if they are rare or hard to earn. Leaderboards Leaderboards rank players according to their relative success, measuring them against a certain success criterion. As such, leaderboards can help determine who performs best in a certain activity and are thus competitive indicators of progress that relate the player's own performance to the performance of others. However, the motivational potential of leaderboards is mixed. Werbach and Hunter regard them as effective motivators if there are only a few points left to the next level or position, but as demotivators, if players find themselves at the bottom end of the leaderboard. Competition caused by leaderboards can create social pressure to increase the player's level of engagement and can consequently have a constructive effect on participation and learning. However, these positive effects of competition are more likely if the respective competitors are approximately at the same performance level. Performance graphs Performance graphs, which are often used in simulation or strategy games, provide information about the players' performance compared to their preceding performance during a game. Thus, in contrast to leaderboards, performance graphs do not compare the player's performance to other players, but instead, evaluate the player's own performance over time. Unlike the social reference standard of leaderboards, performance graphs are based on an individual reference standard. By graphically displaying the player's performance over a fixed period, they focus on improvements. Motivation theory postulates that this fosters mastery orientation, which is particularly beneficial to learning. Meaningful stories Meaningful stories are game design elements that do not relate to the player's performance. The narrative context in which a gamified application can be embedded contextualizes activities and characters in the game and gives them meaning