The design space of tangible and multi-touch tabletop interfaces is complex, and little is known about how the different characteristics of tangible and multi-touch interactive features affect collaboration strategies. With this work, we report on five different features designed for an interactive tabletop application to support collaborative problem-solving. We present the design details and describe preliminary results obtained from a user study with 15 participants. CCS CONCEPTS• Human-centered computing → User studies; Collaborative interaction; User centered design.