https://www.ronpub.com/ojis/OJIS_2019v6i1n01_Groppe.html Channel of the paper: Sven Groppe and Ian Pösse: Multi-Game Code-Duel for Learning Programming Languages, Open Journal of Information Systems (OJIS), 6 (1), pages 1-23, URN: urn:nbn:de:101:1-2020011918334950197619, 2019 en-us https://www.ronpub.com/ojis/OJIS_2019v6i1n01_Groppe.html http://nbn-resolving.de/urn:nbn:de:101:1-2020011918334950197619 Software developers compose computer instructions following the rules defined in programming languages for the purpose of automatic information processing. However, different programming languages have different syntax and semantic rules, and support different programming paradigms and design patterns. Learning a programming language needs many efforts and much practicing in order to master the rules and apply the patterns. Leaning multiple programming languages at the same time, of course, needs more efforts. In this work we develop the concept of multi-game and an e-learning platform called "Multi-Game Platform for Code-Duels" for learning multiple programming languages easily and efficiently. A multi-game is a video game, which consists of several mini-games. Dividing a big game into mini-games reduces the development efforts and implementation complexity. "Builders" is a multi-game developed in our platform consisting of three mini-games. Each mini-game can be solved by implementing a program by learners using different languages. Using our multi-game platform, each mini-game of Builders can be developed easily and played independently of the other mini-games. Finally, a user evaluation over our multi-game platform is performed, where users rate our multi-game approach and platform for learning programming languages very positively.