This study investigates how the competition factor affects the continue play intention in mobile games, with considering perceived enjoyment, switching cost, perceived justice constructs and the modification of self-efficiency. About 500 game players will be surveyed to measure the effects of competition factor and its interaction with other constructs. The expected contribution includes the hints for game makers to design games with considering the perception of player’s competition, and make a balance between the perception competition and other factors such as enjoyment.