RETRACTED: Key factors of heuristic evaluation for game design: Towards massively multi-player online role-playing game

This article has been retracted at the request of the Editors-in-Chief. Please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy).Reason: It has come to the attention of the Editors-in-Chief of International Journal of Human-Computer Studies that this article is highly congruent to the previously published work of J.P. Davis, K. Steury, R. Pagulayan, “A survey method for assessing perceptions of a game: The consumer playtest in game design, Game Studies: The International Journal of Computer Game Research, vol. 5 (2005). The Editors have asked Elsevier to retract the Song and Lee article for the following reason: a substantial part of the literature review (Section 2.1) contains extracted passages without quotes or sufficient changes to the original text and lacks the necessary acknowledgement in the reference section.The Publisher apologizes for any inconvenience this may cause.