What does it mean to design a playful learning tool? What is needed for a learning tool to be perceived by potential users as playful? These questions emerged reflecting on a Participatory Design process aimed at enhancing museum-learning practice from the perspective of primary school children. Different forms of emergent interactions were evident, both during museum visits and while testing a low-fidelity prototype. Deeper reflections on the meaning of enhancing learning through play from a user’s individual perspective was assessed. In this respect, openness and multimodality were evaluated intertwined with design of playful learning tools to enrich non-formal learning and to allow support for individual needs.