Annually, 15 million people are affected by a stroke worldwide. For a third of these patients, the stroke is fatal, while another third will suffer permanent disability. Rehabilitation process for the patients starts in the early days after the injury and represents a long and winding road. Over the past decade new technologies allowed to improve recovery and help stroke patients to regain independence. Among others, virtual reality seems to be a promising added-value to conventional physiotherapy, providing virtual environments and multisensorial inputs to train stroke patients. With the SUN project we aimed to develop tools that combine both physical and virtual worlds. The Clinique romande de réadaptation and the SUN.XR consortium are dedicated to improving the effectiveness of treatments in order to provide patients with cutting-edge tools for their rehabilitation.