  In recent years, there has been an increasing interest in the use of robotic
technology at home. A number of service robots appeared on the market,
supporting customers in the execution of everyday tasks. Roughly at the same
time, consumer level robots started to be used also as toys or gaming
companions. However, gaming possibilities provided by current off-the-shelf
robotic products are generally quite limited, and this fact makes them quickly
loose their attractiveness. A way that has been proven capable to boost robotic
gaming and related devices consists in creating playful experiences in which
physical and digital elements are combined together using Mixed Reality
technologies. However, these games differ significantly from digital- or
physical only experiences, and new design principles are required to support
developers in their creative work. This papers addresses such need, by drafting
a set of guidelines which summarize developments carried out by the research
community and their findings.
