Enhancing Spatial Ability Through a Virtual Reality Game for Primary School Children: "The Wizard of Upside Down": An Experimental Approach. - Theodoros Giakis; Ioanna Koufaki; Maria Metaxa; Aliki Sideridou; Anastasia Thymniou; Georgios Arfaras; Panagiotis E. Antoniou; Panagiotis D. Bamidis (TECH-EDU, 2018)