This study examined the usability of an educational computer game that was developed to assist the psychomotor development of educable mentally disabled children. The game used in the study provides user-computer interaction through a webcam. The study used a case study research model. The participants were two educable mentally disabled children, a teacher and a physiotherapist. The teacher and physiotherapist emphasized that the game can contribute to psychomotor development in educable mentally disabled children. In conclusion, it can be said that the game used is suitable for special education in terms of design and interaction. (C) 2010 Published by Elsevier Ltd.