This paper presents the results of the creation of a game, composed of building blocks, conceived as didactic material for the minimum residences design. The game was designed to be produced by rapid prototyping and digital manufacturing resources. Methodologically, the research was based on both a literature review and an empirical research on the use of a set of building blocks. The text shows the critical analysis and reflections on the results achieved with a workshop entitled "Designing compact homes with building blocks".