projected screen on a wall. Users could post short text clips or images on the wall and play simple games such as Pong. The BlogWall also featured a poetry mode where it would rearrange the messages it received to form a poem and a polling mode where users could ask others to answer their polls. Mario Kart Live: Home Circuit is a mixed reality racing game for the Nintendo Switch that was released in October 2020.[16a-New] The game allows players to use their home as a race track Within the first week of release, 73,918 copies were sold in Japan, making it the country's best selling game of the week. Other research has examined the potential for mixed reality to be applied to theatre, film, and theme parks. Military training The first fully immersive mixed reality system was the Virtual Fixtures platform, which was developed in 1992 by Louis Rosenberg at the Armstrong Laboratories of the United States Air Force. It enabled human users to control robots in real-world environments that included real physical objects and 3D virtual overlays ("fixtures") that were added enhance human performance of manipulation tasks. Published studies showed that by introducing virtual objects into the real world, significant performance increases could be achieved by human operators. Combat reality can be simulated and represented using complex, layered data and visual aides, most of which are head-mounted displays (HMD), which encompass any display technology that can be worn on the user's head. Military training solutions are often built on commercial off-the-shelf (COTS) technologies, such as Improbable's synthetic environment platform, Virtual Battlespace 3 and VirTra, with the latter two platforms used by the United States Army. , VirTra is being used by both civilian and military law enforcement to train personnel in a variety of scenarios, including active shooter, domestic violence, and military traffic stops. Mixed reality technologies have been used by the United States Army Research Laboratory to study how this stress affects decision-making. With mixed reality, researchers may safely study military personnel in scenarios where soldiers would not likely survive. In 2017, the U.S. Army was developing the Synthetic Training Environment (STE), a collection of technologies for training purposes that was expected to include mixed reality. , STE was still in development without a projected completion date. Some recorded goals of STE included enhancing realism and increasing simulation training capabilities and STE availability to other systems. It