For children, play is the preferred way to learn and interact with the world. Thus, play is one of the pillars of preschool education. Education professionals must therefore be able to create stimulating and varied contexts in order to support children's play. To do this, they can play around with several parameters, such as spatial organization, time management, choice of materials, and the use of technological tools. This article reports on an educational activity entitled “Play and Learning in the Child's World,” offered as part of a graduate microprogram in preschool education in Quebec and aimed at education professionals. It details a simulation activity based on peer teaching and knowledge mobilization, with the aim of developing playful skills in adults.