Video game playing has become a very popular activity among adolescents. Its impact on the mental health and well-being of players is just beginning to be explored. This paper reports on the prevalence of problematic gaming in a representative sample of 2,832 Ontario students in grades 7 to 12. The survey included questions about the school grade, family and school related problems, frequency of video game playing and video game related problems as measured by the Problem Video Game Playing scale (PVP). Most of the students (85%) reported playing video games in the past year and 18.3% reported playing video games daily. Slightly less then 1 in 10 of the students (9.4%) endorsed 5 or more of the PVP items (males 15.1%; females 3.1%). Further research is required to delineate the concept of excessive video game playing, its relation to other addictions, and the impact on adolescents' psychosocial functioning.