"Smile to Play" is an interactive video that invites players to engage through facial expressions. Guided by a virtual assistant named Xat, it delves into two main topics. First, it explores the complex dynamics of human/non-human encounters in relation to the recognition of emotion, highlighting the expanding industry known as "affective computing". Second, it examines the concept of happiness and its instrumentalization in neoliberal societies. The performativity of happiness is called into question, and the artwork aims to develop an understanding of how emerging biomediated bodies are utilized for political and economic interests.