The purpose of this study is to derive factors affecting online game developers’ knowledge adoption in third-party online game user communities(OGUCs) and suggest a research model for the future empirical study. To accomplish this goal, we conduct an exploratory case study grounded on one of famous OGUCs operated by the third party company. Based on the heuristic systematic model(HSM) and interviews with three experienced online game developers, we identified three poster-related heuristic factors(reputation, experience, and participation level), three posting-related heuristic factors(the number of views, the number of comments, and the number of recommendations), and three posting-related systematic factors(knowledge quality, degree of disconfirmation, and degree of referencing) that influence developers’ knowledge adoption. We further developed measures for these influencing factors and suggested a research model with five propositions for the future empirical study. We conclude with discussing theoretical and practical implications, along with future research of the study.