This article, Piaget’s theory of moral development in play behaviour is critically reviewed and framed within the philosophical debate on morality. On this basis, an alternative socio-cognitive model for describing normative evolution in play development is proposed. Special attention is paid to the transition from children’s play to adult games, for the purpose of demonstrating that some relevant features of morality stagnate, rather than progress, during such transition. Finally, some speculations are offered on the connection between moral involution in play (...) and ethical behaviour in life, with reference to contemporary Western societies. (shrink)