Mixed reality is the merging of real and virtual worlds to produce new environments and visualisations where physical and digital objects co-exist and interact in real time. A mixed reality game, also called a hybrid reality game, is a game which takes place in both reality and virtual reality simultaneously. Anki drive is a game where players can control remote control cars remotely. Other mixed-reality gaming products are Orbotix's Sphero, a Bluetooth-controlled robotic ball that operates in conjunction with nearly three dozen Apple iOS and Google Android games, and Ubooly's smartphone-controlled stuffed-animal learning toys. These mixed-reality gaming products are currently on a projectory to generate worldwide revenue of $28.9 billion by 2016 with total annual sales over $80 billion.