Abstract: Described are computer-based methods and apparatuses, including computer program products, for simulating events in a real environment. In some example, the simulating events in a real environment includes a method. The method includes determining a user location of a user-controlled object in a virtual environment. The method further includes determining a virtual location of a real-data object in the virtual environment relative to the user location based on a real location of the real-data object in the real environment. The method further includes controlling a present virtual location of the real-data object in the virtual environment based on the virtual location and one or more saved real locations associated with the real-data object.