This article discusses the ways in which digital games affect the behaviours of teenagers by promoting aggression. Also highlighted is what the field of neuroscience can tell us about the implications of using digital games, particularly with respect to their effects on teenagers’ brains and, consequently, on their behaviours. In addition, this paper demonstrates the importance of conducting research on the ways in which the use of digital games affect teenagers’ behaviour, values and mental health and stresses the need to find ways in which to ensure the safe use of digital games and other new entertainment media.