Each game is five timed rounds. You stand inside a 360-degree scene, such as a riverside reed harvest or a crowd gathered beneath Uluru, and read the clues in the clothing, buildings and landscape. Then you drop a pin on the map, set the year on a timeline and submit, and the game draws a line to the real spot and shows your distance and year errors with a short article about the event. Single-player mode needs no account, while ranked and party modes ask you to sign in. Works on phones and computers.