Previously my research was in vision and image processing but since 2007 I have been working in serious games and in particular games to aid therapists in treatment of mental health problems. A number of games have been developed and these have tended to make use of the fact that the computer game can engage groups who have low attention span in other areas. The games also make use of tracking player behaviour as well as embedding therapeutic aims or situations which stimulate the player to communicate with their therapist. Recently the idea of using "expression detection" has added a new dimension to this work and games are beginning to be developed that allow the computer to make an estimate of the player engagement with the game and with the ideas of the game. It is hoped these will help the games to adapt to player needs and provide extra feedback to the users.