Traditional personality assessment methods fall into the categories of behavioral, observational, and self-report measures. In our research we explore the potential of adding another approach to this arsenal: personality assessment through video games. Video games combine the strengths of behavioral and observational measures, while side-stepping the reliability issues inherent in self-report. Additionally, video games offer a higher ecological validity than the traditional personality assessment methods. To determine if video games may contribute to personality assessment, we set out to answer the question: Does the statistically trackable play style of a player significantly correlate to his personality? Through the effective use of promotional material, 13,376 participants were recruited for our experiment. Each one filled out an IPIP Big Five personality test and provided access to their game statistics for the online multiplayer shooter Battlefield 3. In order to answer the research question, correlations between play style and personality were calculated. The results are also relevant to game developers who wish to personalize a game experience to an individual player.