Playing videogames is a popular social activity; people play videogames in different places, on different me­dia, in different situations, alone or with partners, online or offline. Unsurprisingly, they thereby share space (physically or virtually) with other playing or non-playing people. The special issue investigates through different contexts and settings how non-players become participants of the gaming interaction and how players and non-players co-construct presence. The introduction provides a problem-related context for the individual contributions and then briefly presents them.