Ragnarok Online (Korean: 라그나로크 온라인, marketed as Ragnarök, and alternatively subtitled The Final Destiny of the Gods) is a massively multiplayer online role-playing game (MMORPG) created by Gravity based on the manhwa Ragnarok by Lee Myung-jin. It was released in South Korea on 31 August 2002 for Microsoft Windows. Wikipedia
Research exclusive to this game
Chen, Kuan-Ta, Jhih-Wei Jiang, Polly Huang, Hao-Hua Chu, Chin-Laung Lei, and Wen-Chin Chen. “Identifying MMORPG bots: A traffic analysis approach.” In Proceedings of the 2006 ACM SIGCHI international conference on Advances in computer entertainment technology, pp. 4-es. 2006.
Chotipaktanasook, Nuttakritta, and Hayo Reinders. “A massively multiplayer online role-playing game and its effects on interaction in the second language: Play, interact, and learn.” In Handbook of research on integrating technology into contemporary language learning and teaching, pp. 367-389. IGI Global, 2018.
Reinders, Hayo, and Sorada Wattana. “The effects of digital game play on second language interaction.” International Journal of Computer-Assisted Language Learning and Teaching (IJCALLT) 5, no. 1 (2015): 1-21.
Thawonmas, Ruck, Yuki Konno, and Kohei Tsuda. “Discovery of online game user relationship based on co-occurrence of words.” In Entertainment Computing-ICEC 2006: 5th International Conference, Cambridge, UK, September 20-22, 2006. Proceedings 5, pp. 286-291. Springer Berlin Heidelberg, 2006.
Research that includes this game in its sample
Rosario, Robert AM, and George R. Widmeyer. “An exploratory review of design principles in constructivist gaming learning environments.” Journal of Information Systems Education 20, no. 3 (2009): 289.