  This paper presents a review of the status of currencies in video games. The
business of video games is a multibillion-dollar industry, and its internal
economy design is an important field to investigate. In this study, we have
distinguished virtual currencies in terms of game mechanics and virtual
currency schema, and we have examined 11 games that have used virtual
currencies in a significant way and have provided insight for game designers on
the internal game economy by showing tangible examples of game mechanics
presented in our model
