\begin{thebibliography}{1} \bibitem{tynan} Tynan Sylvester. Designing games - a guide to engineering experiences. In {\em Designing Games - A Guide to Engineering Experiences}, pages 0--1000, Vancouver, Canada, Feb 2013. \bibitem{gantt} Alexandre Thomas. Ganttproject. https://www.ganttproject.biz/, 2003. \bibitem{store} J.~Clement. Number of available applications in the google play store from december 2009 to june 2019. https://www.statista.com/statistics/266210/number-of-available-applications-in-the-google-play-store/, 2019. \bibitem{git} Github. https://github.com/. \bibitem{fork} Christopher Hribar. Fork of ganttproject. https://github.com/hribhrib/ganttproject, 2019. \bibitem{keith} Ao.Univ.-Prof. Dr.~Keith Andrews. 9.7.1 post-test interview. In {\em Human-Computer Interaction}, page 142, ISDS, Graz University of Technology, Inffeldgasse 16c, A-8010 Graz, Mar 2019. \bibitem{servicemarketing} Huotari, Kai, and Juho Hamari. "Defining gamification: a service marketing perspective." Proceeding of the 16th international academic MindTrek conference. ACM, 2012. \bibitem{esport} Esports Earnings. https://www.esportsearnings.com/tournaments \bibitem{doesitwork} Hamari, Juho, Jonna Koivisto, and Harri Sarsa. "Does Gamification Work?-A Literature Review of Empirical Studies on Gamification." HICSS. Vol. 14. No. 2014. 2014. \bibitem{stackbadges} StackOverflow, Badges. https://stackoverflow.com/help/badges \bibitem{gamifirmen} Gamification-Unternehmen. https://www.gameffective.com/, https://www.game-learn.com/, https://www.gamewheel.com/ \bibitem{bk} Von gamewheel entwickelte Spiel für BurgerKing. https://www.gamewheel.com/stories/burger-king \bibitem{video} GanttProject Tutorial Video, https://www.youtube.com/watch?v=5rHCSa5ad34 \bibitem{learn} Muntean, Cristina. (2011). Raising engagement in e-learning through gamification. Proc. 6th International Conference on Virtual Learning ICVL. \bibitem{defgami} Deterding, Sebastian, et al. "From game design elements to gamefulness: defining gamification." Proceedings of the 15th international academic MindTrek conference: Envisioning future media environments. ACM, 2011. \end{thebibliography}