They started as simple blocks of light, but few predicted they heralded a revolution in entertainment, video games had arrived. An entire generation has now grown up immersed in virtual worlds becoming ever more realistic and like television and film before them they are not without controversy. Video games stand accused of making us violent or causing addiction, but do any of these claims hold water and are they actually true? BBC’s Horizon enters this explosive digital world to uncover the evidence and questioning the concept that video games are harmful to the development of human beings.