This paper presents the design of a table-top game supporting the treatment of children with Cerebral Palsy. The game was developed through a participatory design process involving therapists and children from the target user group. The game is implemented on top of a platform that supports the implementation of tangible user interfaces using sensing technology. We argue that physical interaction, motivated and constrained by the design of tangible interfaces, offers enormous potential for occupational and physical therapy where patients need to practice specific and repetitive movements.