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The literature on using serious games for learning has been growing exponentially during the last decade. It is time to examine some methodological issues associated with this line of research. There is evidence that research on serious games, if designed with methodological rigor and executed properly, such as the serial studies of prisoners? dilemma, modality effect in individual interactive learning, and changes in attitude toward mathematics in a computer-based simulation game, can be fruitful and have a profound, positive impact on learning and training. Since adopting serious games as an educational technology tool is by no means cheap, we should ensure that methodological issues are carefully considered before conducting a study on educational games. Whereas there are excellent studies in the existing literature of simulations and games, it is not uncommon for some studies to adopt convenient samples or own-control designs.