A method of changing a virtual world of a computer-implemented game based on real-world locations of players of the computer-implemented game is disclosed. A presence of a player of the computer-implemented game is detected at a physical location. A presence of an additional player of the computer-implemented game is detected at the physical location based on a communication received from the player of the computer-implemented game. An aspect of the virtual world of the computer-implemented game is changed based on the detecting of the presence of the player at the physical location and the detecting of the presence of the additional player of the computer-implemented game at the physical location.