Most domestic online games are foreign games authorised for distribution in Taiwan. Thus, domestic distributors do not have the right to change the design of games. All that they can do is provide sufficient support and improve service quality, system quality (SQ), and information content to online game players. Many empirical studies have pointed to the technology acceptance model (TAM) to explain whether users accept a new information technology. Therefore, this study adopted TAM to investigate external factors that affect gamer acceptance of online games and used SQ, information quality, and service-provider characteristics (SPCs) as external variables. In the aspect of perceptions, SQ was found to have positive effects on perceived ease of use and perceived usefulness. SPCs had positive effects on perceived usefulness and perceived trust. The research finding in the relationship between user perception and attitude and intention was consistent with the TAM suggestion; i.e. perceived ease of use had positive effects on perceived usefulness and user attitude, and perceived usefulness had positive effect on user attitude. Finally, user perceived trust and attitude positively correlated with user intention of use.