In the Age of Empires Series, Mini Maps are used to help the player determine the location of each civilization that is played in the game. It is usually found in the lower-right hand corner of the computer screen. At the start of the game, the majority of the map is black, with little "light." Once the unit ventures beyond the "unknown," the map slowly begins to reveal itself. Units that leave explored areas leave a trail known as the "fog of war" which hides enemy action and activity on the map.