Computer game playing is a popular activity among adolescents yet there have been no systematic studies in the U.K. on its prevalence and its demographics. A questionnaire study was undertaken with 387 adolescents (12-16 years of age) to establish the time spent playing computer games, who they first started playing with, the reasons why they first started and why they play now and negative consequences of play. Results revealed that for many adolescents, home computer game playing can take up considerable time with 7% of the sample playing for at least 30 hours a week. Although there were no differences between males and females in who played computer games, it was established that males were found to play significantly more regularly than females.