This paper reports on the development of an instrument designed to measure the enjoyment of computer game play. Despite the enormous technological progress in the field of computer games, enjoyment of computer game play is still not a welldefined construct. Based on Nabi and Krcmar’s (2004) tripartite model of media enjoyment, a survey questionnaire was developed to measure computer game players’ affective, behavioral, and cognitive reactions. Expert consultation, exploratory and confirmatory card sorting sessions were used to refine the instrument. A survey of computer game players was subsequently conducted to test the instrument. Reliabilities and construct validities were analyzed. Findings and their implications were discussed.