Biometrics are being increasingly used to measure and analyse the player experience in video games. Measures commonly include HR, EEG, GSR, and eye-tracking. Facial expression analysis is becoming more prevalent in analysis of user experience, but has had limited applications to video games. This project involves designing, developing, and testing facial expression analysis software for analysis of video game players. Applications include understanding and measuring the player experience, but also potentially reacting to and creating the play experience.